Re: [AMRadio] Antennas
The other interesting thing about HiQ antennas is that the final must be neutralized very well else it will tend go into some weird oscillations with the slightest mistuning and may oscillator with modulation or at least have significant phasing products causing the signal to be much wider than it otherwise would be. I am not sure, in the case where neutralization is perfect, if HiQ tuning would cause phasing products with modulation near the slope of the tuning curve or not. It seems to me that it would, but the attenuation of the slope may cover that up. John -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of D. Chester Sent: Tuesday, June 22, 2010 10:36 AM To: amradio@mailman.qth.net Subject: Re: [AMRadio] Antennas There have been some interesting cases with short loaded antennas in the BC band, the bandwidth has occasionally been so narrow that the AM sidebands become attenuated! Not going to see that effect in the amateur bands unless someone is running an antenna only a few feet long!! Bernie W8RPW I almost have that situation on 160m when I use my 80m dipole, fed with open wire line and balanced tuner. I can move maybe +/- 5 kHz before I have to retune. Using that antenna set-up is like being crystal controlled, since I have to go down to the tower to re-set the tuner. Hopefully, by upcoming season I'll have my remote tuning system, with reversible DC motor, so I'll at least be able to QSY within the same band without a trip to t he tower. I hope to eventually make it so I can change bands remotely as well. Don k4kyv ___ This message was typed using the DVORAK keyboard layout. http://www.mwbrooks.com/dvorak/ http://gigliwood.com/abcd/ __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[AMRadio] DX-60 plate modulator
I put together a kit with schematic, based around a little 807 modulator I have, for a friend. He never followed up, so its sitting there, and i don't own a DX60. I'd be happy to share schematic with you, or better yet, sell you the kit and you do the work hooking it up. It has a Stancor A3892 polypedance output transformer, a UTC S2 driver transformer, and three 12AU7s, one is mike preamp, one is driver and one is used as cathode follower drivers for the 807 grids. Its a nice compact assembly. 73 John K5PRO New Mexico Date: Wed, 9 Jun 2010 08:03:21 -0700 (PDT) From: Brian - KF5CCN bzwie...@sbcglobal.net Subject: [AMRadio] Heathkit DX-60 plate modulation? To: AMRadio@mailman.qth.net Does anyone have any info for a plate modulation mod for the Heathkit DX-60 Thanks. Brian KF5CCN __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Request for Most Common Capacitor Values to be Reproduced
+/- 20% Modern material will make the capacitors smaller than original so I would suggest to go with only 600V .001 .0022 .0039 .005 .01 .022 .039 .05 or .047 .1 .15 .22 -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of Todd, KA1KAQ Sent: Monday, May 03, 2010 5:32 PM To: Discussion of AM Radio in the Amateur Service; milsurplus; Boatanchors; National Radio Equipment; Hallicrafters Reflector Subject: [AMRadio] Request for Most Common Capacitor Values to be Reproduced Sorry for the multiple list posting, but time is short and max input is desired. Got a call from a friend this afternoon who is talking with a capacitor manufacturer about producing some caps for the radio, guitar amp, and audio crowd. We've talked about this in the past but never got to it. Now it looks like it will happen. The question is, what values would be the most handy to have supplied into the future for restoring old gear? Obviously we can't do a lot of oddball values as we're mainly looking for values that will sell well and be attractive from a production prospective. The few that popped to mind for me were: .1, .01, and .47 mfd at both 400 and 600 vdc. I also specified axial lead instead of the radial leads found on Orange drops since axial leads are better suited to our needs. I'm looking for other values that are likely to be encountered often enough to warrant production. Maybe 6-12 different values to choose from. These would be caps used for bypassing and such, not filtering. I suspect we could get them 'banded' for the foil side as well if folks feel that is important enough. The meeting is set for tomorrow, so timely input is critical. We're *not* looking for a list of manufacturers who already make caps as we believe more is better in this case. Some values are already getting difficult to find. TNX - ~ Todd, KA1KAQ/4 __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] The Art of Ragchewing
Great effort, John. I have enjoyed our QSO's and look forward to more in the future. Lately, I have been striving for brevity and conciseness, as there are more AM enthusiasts joining the fray. Thanks for tabling the subject. 73 de John, K5SEE -Original Message- From: johndt...@post.com To: amradio@mailman.qth.net Sent: Sun, Apr 25, 2010 1:54 pm Subject: [AMRadio] The Art of Ragchewing Hello AM enthusiasts. I think there is a fine art to ragchewing. Because I sometimes struggle with it I wrote up a little article about it. Hope you all enjoy it and I would be open to anything that might be useful to add to it. http://kx5jt.net/AM/QSO.htm 73, KX5JT __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Ham Radio Growing in the Age of Twitter
--... ...-- John, WAØSTX/4 From: collinsra...@comcast.net To: amradio@mailman.qth.net CC: amradio-requ...@mailman.qth.net Date: Wed, 7 Apr 2010 06:43:39 -0400 Subject: Re: [AMRadio] Ham Radio Growing in the Age of Twitter I am conducting a survey that has only three simple but thought-provoking questions: Do you own a soldering iron? Yes ___X___ No ___ Do you own a roll of solder? Yes ___X___ No ___ In the last 30 days, did you solder anything that was related to amateur radio equipment? Yes ___X___ No ___ Thank you for taking this survey. Results will be published after I finish soldering several connections to a restored Viking II. David Knepper, W3ST/W3CRA - Original Message - From: Donald Chester k4...@charter.net To: amradio@mailman.qth.net Cc: amradio-requ...@mailman.qth.net Sent: Tuesday, April 06, 2010 10:07 PM Subject: Re: [AMRadio] Ham Radio Growing in the Age of Twitter Here is the link to the ATC article. Interestingly, the photo on the ATC web page shows a real homebrew amateur radio station from 1939, not a ricebox station full of plastic radios or a shack-on-a-belt. http://www.npr.org/templates/story/story.php?storyId=125586086 __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] FCC Non-cooperation
Thanks Robb, I would like to see 0 Political, and Religious commentary in my life. I have my opinions and would just as soon that others keep theirs to themselves. Its just opinion and no more no matter what your parents preached to you. I look at Amfone every day and every now and then I see a little bit of Political or Religious wisdom tacked onto the end of the message and wonder if he or she took their medication today. I get enough Politics watching the evening news and living here in the bible belt way to much religion in my day to day interaction with my neighbors. 73, John K6HSG - Original Message - From: Rob Atkinson ranchoro...@gmail.com To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Friday, March 19, 2010 4:22 PM Subject: Re: [AMRadio] FCC Non-cooperation On Fri, Mar 19, 2010 at 12:34 PM, BILL GUYGER bguy...@sbcglobal.net wrote: The FCC Chairman just came out saying he sees broadband for all as being the future and broadcasting as somewhere down the list probably on the order of the Town Crier. Your interpretation obviously, but okay, whatever. This is I'm sure part of Obama bin Biden's plan to impliment Big Brother. Orwell was just a bit off on his date. The President, _our_ President (whether you like it or believe it, or not) does not micromanage the FCC but more important, these fantastic conclusions don't belong in a forum about ham AM--save it for some political fever swamp where the echo chamber is alive and well. Be sure to use a spell checker too. 73 Rob K5UJ __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.437 / Virus Database: 271.1.1/2756 - Release Date: 03/19/10 07:33:00 __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[AMRadio] Hammond Transformer ID
The Hammond type 2350 was a 500 watt mod. transformer rated for 500 mA per side on the primary and 500 mA on the secondary, 1 Amp if they are paralleled. It was a universal oil-filled type. Freq. range was 120 - 7000 Hz. No specs. given on the turns ratios, but there must be a lot of combinations with 12 terminals. John K5PRO Message: 7 Date: Tue, 16 Feb 2010 03:22:28 -0800 (PST) From: Jack Griffin jtg4...@yahoo.com Subject: [AMRadio] Hammond Transformer specs. 2350 To: amradio@mailman.qth.net Message-ID: 31255.36615...@web58701.mail.re1.yahoo.com Content-Type: text/plain; charset=us-ascii I have what looks like a large Modulation Transformer. Hammond Model 2350 with 12 HV terminals. It weighs about 50-60 pounds. Anyone have the specs on this beast? Thank you, Jack, WA1BRI __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[AMRadio] 250TH tube
Who was looking for the new 250TH tube to trade for? Thanks and 73, John, K5PGW __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] sdr-iq
Hey Bernie: This is just a suggestion of what you might check into. I am not familiar with the radio but have heard other brick radios that sound pretty good. Concerning the computer, it is possible, although you would not generally want it, to listen to the recorded sound while recording and at the same time listen to the input. Obviously the recorded audio will be slightly delayed from the input causing an echo sound. Most sound cards will record at the same time they are playing something, and have a separate set of controls for recording than for playback however both sets may have a listening level control. Just a suggestion on something to check. John, WA5BXO -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of Bernie Doran Sent: Wednesday, February 10, 2010 12:03 PM To: Discussion of AM Radio in the Amateur Service Subject: [AMRadio] sdr-iq I purchased an SDR-iQ about five weeks ago and while it performs great in a number of areas it seems to be poor in the audio demodulation, at least on AM, I am getting what sounds like a low level echo and a general artificial quality of sound, my 75A2 sounds much better and that certainly is not good quality audio. it is difficult to copy a moderate level AM signal. the computer plays DVDs and CDs fine and sounds good. I talked to the store that I purchased it from and they said they have heard this before and that I should not expect it to sound like a VT receiver! that was a shock, what did I buy it for?. computer is a single core 2.8 gig, it shows it running at about %75. any one else use these things? or have experience with the Flex 5000a? Bernie __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Comment from N0JEF
On Wed, 10 Feb 2010, kj4...@aol.com wrote: I read an article about AM use in the ham bands in a recent QST magazine and was intrigued. The article even gave the favorite AM freqs. I have a 200 watt AM transciever so I wanted to give it a go on 80 meters. Problem is, it seems noone even cares to listen to see if anyone wants to join in. The people just short key it back and forth passing it between the click of regulars and never seem to open it up to see if anyone new wants to join in. Very frustrating. I have many times tried to remind those in a fast-paced roundtables on AM, to find - and then USE - a little known control switch on their rigs, known as the Release To Listen button. Then there's the Aubible Station ID Function every 10 minutes that often fails to get programmed, or is muted, or something Oh yeah: keeping track of your 'place' in a round-table... u, u, wel I fergit who I was s'posed t' send it too, sooo, ummm whoever that was, it's yer turn OM mumble grumble mutter... Cheers John KB6SCO __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Email #2 test
At 09:29 AM 1/24/2010, you wrote: Ah ha, I see where I did not have compose messages in plain text, so let's see if that fixed that. . . . C again Both came through OK here. 73, John __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[AMRadio] Digitizing old records
Not exactly AM radio stuff but it sort of falls in the category of old technology meets the new world. If the list moderator wants to kill this I will certainly understand. We could discuss it separately. I use a modern turntable with 33/45 RPM settings some of the real new TT's do have 78RPM (it is becoming a thing to do). Having the proper stylus is important because it fits the groove and can be set to track a little heavier than a gram. Be careful not to track to heavy, the cartridge may not like it. A lot of the old 78RPM records did not use the standard RIAA equalization of today. There were many different EQs used in those days. Having a 24 bit/96K sound card is a plus for computer recording because you don't have to worry about getting the levels set just right. Just about any visible thing that you can see on the display will be using more than 16 bits in the 24 bit format. This gives you plenty of head room to manipulate the recording latter using the recording software's features to get the sound just the way you want it whether it is RIAA or not. You can even record it at 45RPM and adjust the speed with the software later and re-EQ. After you have it the way you want it to sound then the software will allow you to normalize the recording and then save it to 16 or 24bit format. 16 bit format for CD audio Recording software: Many types are available. Audio Audition by Adobe is what I use - $300 - a little expensive but pretty good. A Canadian company called Goldwave - free trial 40 dollar purchase probably the best bet. I used it before I got Audition. Audacity - Free - I don't know about its EQ and other feature capabilities This is all not recommended on a computer that has glitches or is slow. Good Luck John -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of George Brand Sent: Friday, January 22, 2010 3:41 PM To: Discussion of AM Radio in the Amateur Service Subject: Re: [AMRadio] 78 records I have a real Edison that almost caused a divorce between my Grandparents as Grandma bought via the devilON CREDIT! (oh horrors) Apparently Grandpa had a royal fit and went down to J.L. Hudsons the next morning and paid if off. I have four drawers full of disks and want to move them to digital without harming them. Any guidance? I see there is a stylus marketed for this purpose, any experience?? George __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] frequency sweeper
I have experienced the same thing; but have no factual knowledge of the cause. I have always suspected that some of it may be caused by folks testing their antenna for the low SWR frequency by sweeping the band while transmitting carrier and watching for a minimum reading. I hope I am wrong. 73, John -Original Message- From: Bernie Doran qedconsulta...@embarqmail.com To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Thu, Jan 21, 2010 8:11 am Subject: [AMRadio] frequency sweeper I acquired a SDR radio and have been playing with it for about a mo. It eems very strange tuning with a mouse, but works great as a panadapter icking up the IF. I have noticed for some time that there are signals unning up the amateur bands, always assume some fool just changing requency, however snooping around, I found that the same signals original utside of the amateur bands and sweep those areas also. it/they appear to e unmodulated and as a wild guess appear to move about 75 to 100 KC per econd. My first guess is that they are some sort of propagation testing canner. does anyone know what these are and who does it, power? antennas? ocation? etc? Or perhaps it is the gov't controlers sending some sort of signal to the DBs stations with the new information to impress on us!!. ever wonder why he NDB stations are located in high population areas? _ ur Main Website: http://www.amfone.net MRadio mailing list earchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ ist Rules (must read!): http://w5ami.net/amradiofaq.html ist Home: http://mailman.qth.net/mailman/listinfo/amradio ost: AMRadio@mailman.qth.net o unsubscribe, send an email to amradio-requ...@mailman.qth.net with he word unsubscribe in the message body. This list hosted by: http://www.qsl.net lease help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] OT : Paid Hams during Drills
I am a little confused here, as to what would be changed. 1. Are Hams presently not permitted to participate in these preparedness and drills Or 2. Are they not permitted on behalf of their employer. 3. Or, are you saying that an employer can request, as part of your job description and pay grade, that you participate. The ARRL info, on that page, is very vague on this (as usual) as there does not seem to be any other info about it on the web page, or did I just not see it among all the BS. John, WA5BXO -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of WA5AM Sent: Tuesday, January 19, 2010 11:46 AM To: Discussion of AM Radio in the Amateur Service Subject: [AMRadio] OT : Paid Hams during Drills I know this does not directly involve AM, however it is something that could set a precedent and change our hobby forever if we don't take a stand and tell the ARRL not to allow a petition for rule change. As some of you may know, the ARRL board of directors have met and decided to request the staff petition the FCC to make a change to Part 97.113(a)(3) to permit amateurs, on behalf of an employer, to participate in emergency preparedness and disaster drills that include Amateur operations. To quote a very good ham friend of mine, ...I feel like we have been sold out, sucker punched! I can't believe a majority of ARRL members support this issue. The article is here: http://www.arrl.org/news/stories/2010/01/19/11294/?nc=1 I think ANYONE should be able to operate during a REAL emergency, and that is already in place. Anyone citizen can use any public service radio to call for help. I have no problem with that. We should not take the volunteer out of ham radio. __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] OT : Paid Hams during Drills
Opps: Sorry Bob I did not mean to send that directly to you and only you. Here it is again for all with a little more added: I hope I'm not opening a can of worms here! OK, I think I see the dilemma now, I must say I have mixed emotions here. I see the necessity but I can also see where it could start a trend. I'll need to mull this over a little. I always thought that Hams who worked for anything like a law enforcement or fire and rescue could do what was needed in the way of training to better serve the public but I guess their hands were tied during working hours unless they had a separate volunteer to push the microphone button for them. Is this prevention currently enforced to prevent commercial use of amateur radio? How does it? I would assume that a policeman taking part in a drill, on police time, would use his own call letters would not solicit for the police department. I have been on the job many times driving around town doing my regular job on a wage and have been known to use the repeaters and 40 years ago even check into the old central gulf coast hurricane net once or twice. When did all that become against the law? So part of me wonders if additional regulation is even necessary. Where is the law they might or I have been in the past breaking? Still undecided John __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[AMRadio] Electromagnetic allergies
Its true that there are physiological phenomena that indicate some effects from RF power exposure. In very controlled experiments with rabbits, mice and other creatures, exposure to significant doses of EM fields have caused things like audible clicks in hearing, and calcium ions crossing cell barriers. And these are not necessarily thermally caused, which is the normal effect of high RF (dielectric heating). It may be that there are magnetic field effects, somehow coupling into something in the body. It has been published that there are effects from powerline fields that have affected bee/honey production under right of ways. There is a lot of evidence that migrating birds have some sort of compass-like response to the geomagnetic (static) fields. These two are examples of weak-field effects, that have been observed and reported. The study of exposure to RF, power frequency, and magnetic fields,like chemical and radiation exposure studies, take years of rigorous experiments, to rule out other secondary effects from things like light, airborne material, natural radiation, personal bias in subjects, and on and on. There were studies in Sweden years ago that indicated that people in homes built near power lines or with particular wiring configurations were prone to increased risk of cancer. That landmark study excited a lot of people including realtors, hard-core environmentalists, and what I would call anti-technologists. It also made a big impact on the EM field research community. However, over time it was never repeatable and is no-longer considered valid except in the eyes of those who wanted that positive result. This is an example of a bias towards a particular answer. That said, however, the results of a study that identified 100% positive results from weak RF fields, is likely not real science that can be repeated. It has not been scrutinized or published in any refereed scientific journals or forums, like Nature, Science, AMA. I would be curious to see and read of such experiments. I heard recently that one state (Maine?) has a recommendation under development on exposure to cellphones in nearfield. In certain European countries, similar recommendations have been publicly made, focused on children and weaker adults. These are not scientific results, but are decisions based on prudent judgement, believing that there MAY BE effects which are not yet known. This is not a bad thing for society to do, considering the mistakes that have been made in past NOT making such decisions, asbestos, radium, cigarettes, various chemical toxins, and so on. So while I wouldn't completely rule out that there is some weak-field effect of RF exposure that we haven't discovered, it is so difficult to prove without all the underlying other environmental factors. Personally I tend to poo-poo the wackos and wierdos who claim that they get migraines and cannot sleep in the house next door to someone with a television or cellphone. And i do not attribute this to political conviction such as some here have used, but strictly based on what I know about the science and studies. I have been in high power RF work for my entire career (30yrs) and have paid attention to these things, including reading and researching many of the reports and articles about RF exposure. I do believe that 800 MHz-1.9 GHz watt-level cellphones being held next to the brain, is not a smart thing for humans to do, and that we have to somehow change that or we may indeed find long term detrimental societal consequences. This is not a weak field effect, but a near field hazard. Arthur and Dr. Elke in Santa Fe are not what I consider to be examples of normality. They are on the fringe. We have so many people that come here from (guess where, Texas and California!), that we can now call it the land of fruit and nuts instead of the 'city different'. Touche! 73 John K5PRO __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[AMRadio] Santa Fe-The City Different
This letter was in yesterday's New Mexican newspaper: Scary science I have a question for our glorified science laboratory Frankensteins who need to learn to keep their egos on the leash and who are meddling with dangerous Tesla and high-frequency active aural research technologies; space lasers; chem trails, magnets, CERN particle acceleration, etc. — just a few of the eerie inventions endangering life on Earth. Do these affect the weather or the natural electromagnetic fields that make up all life? Duh! Dr. Elke Meyer Santa Fe I think Elke may be Arthur Firstenberg's doctor. She has written letters and op ed pieces for years condemming cellphones and now WIFI as abominations. Now she is citing my workplace (the lab) and my hero Telsa, along with magnets. Uh oh! I'd love to introduce Art and her to my new 3 megawatt 200 MHz pulsed amplifier (540 kW average power). You gotta remember these are the same people who claim the Santa Fe Hum is driving them crazy... Bill AD5OL There was never a Santa Fe hum, it was the Taos hum, and it was prevailent in the 1990s. Haven't heard much about it this decade although I did hear last month that a few ranchers up there are in arms again about cattle mutilations. Here come the black helicopters at night ... Art Bell stuff. You gotta wonder what kind of education Mr. Firstenberg got in the first place? Obviously not disciplined in the sciences. Sleeping in his car to avoid EMI 73 John K5PRO Santa Fe county, NM __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[AMRadio] 6146 modulators
I can't find any of my 1950's/1960's ARRL Handbooks to see if I can find a schematic of a modulator using push-pull 6146's. If anyone has the above, please e-mail me off-list. Thanks!! I traded for a modulation transformer which was used with P-P 6146's. Joe W4AAB Hi Joe You can take the Apache and DX100 modulator circuit diagram, and replace 6CA7/EL34 and 1625, respectively, with 6146's, change the sockets, raise the screen voltage, and it'll play fine. I tried them in my DX100, and found conversion to EL34s was plenty good for that rig. Of course, as someone mentioned, the Valiant had a pair. 73 John K5PRO __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Threads that go on and on
I am not arguing the point, but you folks are ignoring the point that a reflector is NOT a personal conversation between TWO people, It is PUBLIC forum. If it were no, members would be taking their conversations to direct email between TWO people. It is obvious that those who keep justifying the belaboring of miniscule points and engaging in one upmanship to demonstrate ones' superior knowledge will never admit that there are those who run on and on and take pride in grandstanding on a public forum. I am not trying to pick an argument although most replies I have seen, basically say we are COMPLETELY correct and your position is without merit. I am not always right but in my profession, I could have not made a good living without common sense, intellect and, and very good logic. Why don't those who like the reflector to be flooded with on and on just say right or wrong that is the way it is going to be and if you don't like it, just leave !! People who RESPECT other people, don't monopolize a public forum and don't feel that they MUST comment repeatedly on every topic that comes up even after the topic has been addressed, undressed and addressed again. In conclusion, I will call your attention to the Hallicrafters reflector as it was several years ago and remind you that after the matter was straightened out by Al Waller, the hallicrafters public forum becme a pleasant, fun, informative and tolerable forum. Is there only one reasonable and acceptable position and is it that everyone else is wrong?? 73, John, K5PGW - Original Message From: Ron.K3PID ron.k3...@sbcglobal.net To: amradio@mailman.qth.net Sent: Sat, December 19, 2009 3:49:26 PM Subject: Re: [AMRadio] Threads that go on and on Maybe I'm missing something here but aren't email threads just another communication medium? How is it different from a phone discussion or even a CW discussion or to the extreem, a face-to-face discussion? If it's a lively discussion, that gets a lot of activity, isn't that a good thing? Would we want to tell someone in a phone discussion that they can only talk for 3 minutes and then move on to the next subject? I don't think so! The thread is what it is! If there isn't much interest, then it won't last long but if it whips up a lot of interest ( opinion) then it should-could go for a while. I say so what! As long as it remains civil and on topic, then let it go! If you get too many emails then delete them! You don't have to read them if you are not interested in the subject. Or have I missed the point? K3PID Ron H -- This outgoing email was scanned by Norton 360 and found to be virus free! __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Threads that go on and on
Hello Jim. The answers are: Yes I like to see all posts that are relatively relevant and responsive to the initial post. NO, I don't think the moderator should have to step in and say enough is enough. I think the members should exercise SELFf control and hesitate to jump in and post input and opinion about EVERY query or subject broached on the reflector. I think WE should ask ourselves, has there been an intelligent, relevant and helpful response thus far and do I really have anything meaningful to add to the discussion? Then, we should decide whether what we have to offer has already been posted and if the query has been fully addressed in other responses. Then we should ask ourselves, has the original poster been given sufficient information to fully address his need. Maybe we should drop the original poster a direct email to determine if further treatment of his subject matter is needed. No! regarding the time limit, but I think the original poster should be given WHAT HE HAS ASKED FOR and not a lot more. If someone posts a query asking what time is it, he should not be given ten lessons on building a watch. There are often simple questions asked to which replies are given that resemble a doctoral dissertation that may leave the original poster of the query thinking, I am sorry I asked because, I really didn't want to know that much. A simple question should get a simple answer!!! No, I do not want to control what is posted. I think topics on the AM reflector should be related to the mode of AM radio and the electronic theory, electronic principles, formulas and practical application of the AM mode. I think that well meaning Amateurs, who participate on the AM reflector or any other reflector, with the benevolent attitude of being of service to fellow Amateurs who are in need of assistance, will do what is right. I believe that those who post for the purpose of showboating, grandstanding, trying to impress others with their expertise and trying to show that his or her knowledge is SUPERIOR to other responders to a post will not do the right thing. I say, be considerate of your fellow Amateurs and use the reflector for their benefit and yours and not to IMPRESS others for your gratification and we will have a GREAT AM reflector. Self Control and respect will do the job. 73, John, K5PGW - Original Message From: Jim Wilhite w...@brightok.net To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Sat, December 19, 2009 6:08:13 PM Subject: Re: [AMRadio] Threads that go on and on John, I am confused. Do you like to see any post made by others about a topic? Do you think that the moderator should, after several posts, tell the rest to hold their comments? Do you wish to see a time limit on a topic? Do you not wish to see a time limit? Do you wish to control what is posted? Do you not wish to control what is posted? 73 Jim/W5JO - Original Message - I am not arguing the point, but you folks are ignoring the point that a reflector is NOT a personal conversation between TWO people, It is PUBLIC forum. If it were no, members would be taking their conversations to direct email between TWO people. It is obvious that those who keep justifying the belaboring of miniscule points and engaging in one upmanship to demonstrate ones' superior knowledge will never admit that there are those who run on and on and take pride in grandstanding on a public forum. I am not trying to pick an argument although most replies I have seen, basically say we are COMPLETELY correct and your position is without merit. I am not always right but in my profession, I could have not made a good living without common sense, intellect and, and very good logic. Why don't those who like the reflector to be flooded with on and on just say right or wrong that is the way it is going to be and if you don't like it, just leave !! People who RESPECT other people, don't monopolize a public forum and don't feel that they MUST comment repeatedly on every topic that comes up even after the topic has been addressed, undressed and addressed again. In conclusion, I will call your attention to the Hallicrafters reflector as it was several years ago and remind you that after the matter was straightened out by Al Waller, the hallicrafters public forum becme a pleasant, fun, informative and tolerable forum. Is there only one reasonable and acceptable position and is it that everyone else is wrong?? 73, John, K5PGW __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net
[AMRadio] Threads that go on and on
I am not being critical of any ONE person, but the threads go and on, on the reflectors. Yes, I have a delete button, but that is usually the reply of those who grandstand with their posts trying to either WOW the list or PUT DOWN someone they don't like or agree with. Many times, when a serious technical question or subject is brought up, there are those who seem to see that as an invitation for a debate. About that time it begins to get nasty and ungentlemanly. I get a LOT of help from the many lists I am subscribed to because being the owner of a large bone yard of vintage gear, I always have questions, if not to learn something new, but to verify for myself that my analysis was correct. There are those who must believe that a ham who has been licensed for 52 years, has worked in Broadcast and who has a General Radiotelephone (formerly first class) license, just left the VE testing session and doesn't know how to plug his latest bell and whistle 9000 Super Duper Japanese Marvel in the wall socket. Do you think that may be why one is often asked, when he posts a question, IS IT PLUGGED IN?? I get some GREAT technical help and parts help from the reflectors and that is why I stay subscribed. There are those so narcisistic that they have no introspection and they proceed like a blind hog after an acorn as we say down south, and think anything they say and do on the reflector is correct, helpful and gentlemanly. That is not the case!! So, when you start telling well meaning, gentlemanly and knowledgeable Amateur Radio Operators, of long standing and experience and in LIFE and ELECTRONICS to LIKE it or TAKE a HIKE, maybe you should get your trail map out!! I love the reflectors and am staying and will do my best to ignore those who don't respect their fellow Hams. 73, John, K5PGW __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] HRO question for the day
Jim After looking over your web document. As I see it then the slew distortion is caused by the RF bypass capacitor's inability to discharge fast enough to follow the shape of the audio as it falls. Or, you might say the inability of the load resistor to discharge the capacitor fast enough. If that is the case then it probably effects the higher modulating frequencies more that the lower ones. The Audio bypass is chosen to reduce the RF component of the rectified output to some acceptable value. If that is true then the circuit design could be improved by starting with a higher IF frequency. I would think that the greater ratios of RF to audio frequency would lend its self to a lower time constant there by extending the frequency range of the less distorted audio, Assuming I am on tr5ack here, perhaps one thing that might help is a full wave detector. Two diodes on a center tapped secondary IF XFMR. A smaller bypass capacitor could be used because the RF ripple would be twice the original IF frequency. Am I on track with any of this detector thinking? Do active detectors or DBL Bal product detectors have similar problems? My guess is that they do, but probably not as noticeable except at lower RF to AF frequency ratios. I know many folks that would say it isn't that important and to some degree they are right but it doesn't stop me from trying to understand and design something that is a little better. My fun in this hobby is in the design and modification aspect. Even if no one can tell the difference, it helps me to understand. John, WA5BXO __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Relay Rating (JAMES HANLON)
HI Jack, 24 or 48 volts DC should do it. Used in telephone work, #1ESS and other systems. It is fast operating. Try 24 volts first. (I forget now.) 73, John At 05:48 AM 12/17/2009, you wrote: Jim Hanlon, W8KGI Do you have the relay specs for a Western Electric 303J? It is an octal and may have the coil on pins 7 and 8; I measure about 100 ohms across them. It is sealed with a High Pressure warning on the metal case which is about 2 inches high. Thank you, Jack, WA1BRI __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] HRO question for the day
I can see a small amount of contact bias being generated by the 6H6, 6AL5, etc. But that would be easy to compensate with divider from the cathode bias of the output tubes or any small positive source. I guess they may have been looking for an easy fix to get the S-meter to zero. This is all very interesting but why not just solder in a Germanium 1N64 or a NTE109 or Silicone NTE177 or even a NTE519 with 4 ns recovery time. I pulled the 6AL5 out of my HQ170 and went to diodes. Saving 150ma of heater current W. I ask this sincerely because I really don't know. What would be the disadvantage of using small signal solid state diodes as long as the IF frequency isn't too high. John __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[AMRadio] Relay rating
Will 10 amp rated contacts on a relay handle 300 watts of carrier from an AM transmitter? Your opinion based upon your experience will be appreciated. Thanks and 73, John, K5PGW __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[AMRadio] Paint question
A friend of mine sent me a nice Harvey Wells Bandmaster transmitter. He repainted the cabinet a glossy black. It looks GREAT, but is not the original wrinkled or gritty looking finish. It is perfectly smooth with no dents or scratches. He is a great painter. My question is: Is there a wrinkled or rough finish paint that can be applied DIRECTLY over this glossy black paint? Does anyone know the correct color for the Harvey Wells Bandmaster cabinet? I am not sure if St. James Gray such as the 75A Collins line would be the correct color or not. I seem to remember the color being a very dark gray , but not quite black I don't want the wrinkled (as in SX 28A face plate) color, but more like the finish of the cabinet on the SX 28A or the finish on the 75A line of Collins gear IF THAT IS VERY CLOSE TO THE ORIGINAL COLOR OF THE HARVEY WELLS BANDMASTER. Your input will be appreciated. 73, John, K5PGW __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Paint question
John There is an early bandmaster on ebay right now that has adifferent color and finish than the later ones. If it is originol which it appears to be yours might have been similar? http://cgi.ebay.com/Harvey-Wells-ham-radio-transmitter-museum-quality_W0QQitemZ320459399262QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item4a9cde605e 73, John K6HSG - Original Message - From: John King k5...@yahoo.com To: amradio@mailman.qth.net Sent: Thursday, December 10, 2009 7:02 AM Subject: [AMRadio] Paint question A friend of mine sent me a nice Harvey Wells Bandmaster transmitter. He repainted the cabinet a glossy black. It looks GREAT, but is not the original wrinkled or gritty looking finish. It is perfectly smooth with no dents or scratches. He is a great painter. My question is: Is there a wrinkled or rough finish paint that can be applied DIRECTLY over this glossy black paint? Does anyone know the correct color for the Harvey Wells Bandmaster cabinet? I am not sure if St. James Gray such as the 75A Collins line would be the correct color or not. I seem to remember the color being a very dark gray , but not quite black I don't want the wrinkled (as in SX 28A face plate) color, but more like the finish of the cabinet on the SX 28A or the finish on the 75A line of Collins gear IF THAT IS VERY CLOSE TO THE ORIGINAL COLOR OF THE HARVEY WELLS BANDMASTER. Your input will be appreciated. 73, John, K5PGW __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.709 / Virus Database: 270.14.101/2555 - Release Date: 12/09/09 13:41:00 __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] deliberate encroachment
Just curious what type Military Net would be in the Ham Bands? 73, John, K5PGW - Original Message From: Bernie Doran qedconsulta...@embarqmail.com To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Sat, December 5, 2009 5:41:48 AM Subject: [AMRadio] deliberate encroachment woke up early this AM and called CQ on 3887, as there was a qso in progress on 3880. had been in QSO for about twenty minutes and at 5 AM the military Net fired up on 3885. All they had to do was advise that there was going to be a net starting at 5 and I would have slid away, but no, there would be no reason to do that. I am sure it was my fault for being near THEIR freq. Probably some of the people in this group bitch about the SSB deliberate encroachment. This lack of the most simple respect disgusts me. Bernie W8RPW __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Muting the R390 on transmit
Thanks a lot for the info, Grant. I did as you suggested. I placed the break in switch ON and got 12.95 vac at terminal 9. With the break in switch OFF, I read 1.68 vac at terminal 9. I HEAR NO RELAY CLICK, only the switch click when I turn the break in switch on. So the voltage is applied when the switch is turned to break in ON but no relay click. So, it sounds like a bad relay. What is the proper designation of the break in relay? Where do you think I might get one? Is it located where fumble fingers can replace it without taking the receiver apart? I suppose it is located in the audio module, but am not sure where that is. I am going to try and locate that portion of the manual and maybe part of the schematic and a pictorial, if such exists. I know I ask a lot of questions, but I am not to proud to ask what I need to know from those who do know. I really appreciate your assistance and advice. 73, John, K5PGW - Original Message From: Grant Youngman n...@tx.rr.com To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Tue, December 1, 2009 11:14:01 PM Subject: Re: [AMRadio] Muting the R390 on transmit Do you have the Break In switch on the front panel set to ON? It's the switch just below the AGC speed selector If so, check terminal 9 for 6.3 vac. (or maybe 12.6 vac, I forget which). If you don't hear a relay click, when grounding terminal 9 AND the break in switch is ON, then either the relay is bad, or the ac voltage to the relay (through the BRK IN terminal) is interrupted somewhere. If you can hear the relay close, and the radio still doesn't mute, then something else is amiss. Grant On Dec 1, 2009, at 9:49 PM, John King wrote: Thanks for the reply, Grant. My R 390 doesn't mute when terminal 9 is grounded. I have connected an alligator clip lead to terminal 9 and then connected the other end of the clip lead to terminal 16 which is ground and there is no effect. I can't figure out why there is no effect when terminal 9 is grounded. What do you think, Grant? I do not have a manual or schematic for the R390. 73, John, K5PGW __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Muting the R390 on transmit
Thanks for the source of information, Jerry. I have looked at the schematic on the Y2K site and see relay 601, the break in relay. Now I must physically locate it and determine if the relay is indeed bad. I have 12.95 vac at terminal 9 on the terminal board on rear of R390. Now to locate the relay and determine if a component between the power source and the relay coil is bad. I suspect a resistor that may be in series with the relay coil voltage supply in my imagination because I haven't located such a resistor. I remember a faint smell of hot carbon when I first attempted to energize the relay by grounding terminal 9 and additionally, I observed slight arcing when I connected the grounded alligator clip to terminal 9. If the foregoing tells you anything, please feel free to direct me. Thanks again and 73, John, K5PGW From: Jerry K w...@hughes.net To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Wed, December 2, 2009 7:33:20 AM Subject: Re: [AMRadio] Muting the R390 on transmit Greetings, John... I noted you said you didn't have a manual or schematic for this receiver. Before you do anything else, do yourself a giant favor and go to these two websites: R-390A FAQ Page http://www.r-390a.net/faq-refs.htm An exhaustive list of carefully gleaned technical references on this fine receiver, in downloadable PDF format. R-390A Y2K Manual (Release 3) http://www.r-390a.net/Y2K-R3/index.htm A complete annotated and updated version of the R-390A Technical Manual. This manual has been painstakingly compiled, rewritten for clarity and accuracy, and is kept updated by a large group of experienced techs who own and have worked on the R-390A for many years. Downloadable (PDF files) by chapter, or as one massive file. Just about anything you need to know is available on these two web pages. I have only rebuilt five of these great receivers over the years, and I have a complete set of the original military versions of the R-390A manuals, but like most of us R-390A nuts the Y2K manual is my working bible for this receiver. It is much easier and faster to use than the original military versions. You will benefit (at no charge, no less!) from the hundreds of hours invested in updates, corrections, and clear, easy to follow troubleshooting information contained in the latest release of the Y2K Manual. These guys have invented the wheel for you, don't waste time reinventing it. :) Have fun, Jerry W5KP John King wrote: Thanks for the reply, Grant. My R 390 doesn't mute when terminal 9 is grounded. I have connected an alligator clip lead to terminal 9 and then connected the other end of the clip lead to terminal 16 which is ground and there is no effect. I can't figure out why there is no effect when terminal 9 is grounded. What do you think, Grant? I do not have a manual or schematic for the R390. 73, John, K5PGW __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Muting the R390 on transmit
I have the R 390, Bob. Thanks. John, K5PGW - Original Message From: rbethman rbeth...@comcast.net To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Wed, December 2, 2009 12:31:06 PM Subject: Re: [AMRadio] Muting the R390 on transmit The cited References are for the R-390A. John, which is it you have? *IF* it is the R-390A, then the break-in relay *IS* K-601 in the AF Module. Bob - N0DGN Grant Youngman wrote: On Dec 2, 2009, at 10:46 AM, John King wrote: Thanks for the source of information, Jerry. I have looked at the schematic on the Y2K site and see relay 601, the break in relay. Now I must physically locate it and determine if the relay is indeed bad. I have 12.95 vac at terminal 9 on the terminal board on rear of R390. Not sure of the age or condition of your 390, but you might also just try pulling and reseating P120/J620 on the audio chassis. Among other stuff, this connector carries the operating voltage to the Break-in relay, K-602. (K-601 is actually the squelch relay). Both relays just ground the audio out from the AF amplifier V-601 through the interstage transformer T-601. Pins 1 and 2 of P120 carry the control voltage to the relay. You could measure the voltage there also, to make sure it's getting that far along when pin 9 of the rear connector strip is grounded. Grant/NQ5T __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html -- +--+ | AM Amateur Radio OperatorNØDGN | +--+ | http://home.comcast.net/~rbethman/ | +--+ | Bob Bethman\\\|/// The absence of a danger | | \\ ~ ~ // signal does *NOT* mean | | rbeth...@comcast.net (/ @ @ /) that everything is OK | +--o00o---°(_)°---o00o-+ __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[AMRadio] Shucks!!!!!
SHUCKS, I just printed almost 60 pages of the manual for the wrong receiver. I have the Collins R 390, NOT the R 390A !! Now I have some schematic prints and partial manual for the R 390A. Back to SQUARE ONE!!! NOW WHUT??? It is terrible to be OLD but worse to be OLD AND DUMB!! 73, John, K5PGW __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Shucks!!!!!
Don't worry about it John. If your old brain is like mine, you won't remember by morning. 73, John At 02:34 PM 12/2/2009, John King wrote: Back to SQUARE ONE!!! NOW WHUT??? It is terrible to be OLD but worse to be OLD AND DUMB!! 73, John, K5PGW __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Muting the R390 on transmit
Thanks Larry. I have switched the break in to ON and had no mute. I have 12.95 vac at terminal 9 on the terminal board on the rear of the rcvr with the break in switch on and 1.68 vac at terminal 9 when the switch is off. 73, John, K5PGW - Original Message From: Larry Szendrei n...@securespeed.us To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Wed, December 2, 2009 1:43:22 PM Subject: Re: [AMRadio] Muting the R390 on transmit Thanks for the reply, Grant. My R 390 doesn't mute when terminal 9 is grounded. I have connected an alligator clip lead to terminal 9 and then connected the other end of the clip lead to terminal 16 which is ground and there is no effect. I can't figure out why there is no effect when terminal 9 is grounded. What do you think, Grant? I do not have a manual or schematic for the R390. 73, John, K5PGW You didn't mention whether the Break In switch was on, which, as Grant said, must be for it (=grounding the break-in terminal) to mute the receiver. Or, maybe there is a problem in that circuit in your R390. I used this function on my R390/URR, and it worked exactly as Grant described. 73/GL, -Larry/NE1S -- Pay a visit to my amateur radio web page at: ne1s.rfburn.org __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Muting the R390 on transmit
Thanks Bob, I will go there, 73, John, K5PGW - Original Message From: rbethman rbeth...@comcast.net To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Wed, December 2, 2009 2:20:36 PM Subject: Re: [AMRadio] Muting the R390 on transmit John, The manuals are on EDEBRIS. http://bama.edebris.com/manuals/military/r390/ Bob - N0DGN John King wrote: Thanks Larry. I have switched the break in to ON and had no mute. I have 12.95 vac at terminal 9 on the terminal board on the rear of the rcvr with the break in switch on and 1.68 vac at terminal 9 when the switch is off. 73, John, K5PGW - Original Message From: Larry Szendrei n...@securespeed.us To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Wed, December 2, 2009 1:43:22 PM Subject: Re: [AMRadio] Muting the R390 on transmit Thanks for the reply, Grant. My R 390 doesn't mute when terminal 9 is grounded. I have connected an alligator clip lead to terminal 9 and then connected the other end of the clip lead to terminal 16 which is ground and there is no effect. I can't figure out why there is no effect when terminal 9 is grounded. What do you think, Grant? I do not have a manual or schematic for the R390. 73, John, K5PGW You didn't mention whether the Break In switch was on, which, as Grant said, must be for it (=grounding the break-in terminal) to mute the receiver. Or, maybe there is a problem in that circuit in your R390. I used this function on my R390/URR, and it worked exactly as Grant described. 73/GL, -Larry/NE1S -- +--+ | AM Amateur Radio OperatorNØDGN | +--+ | http://home.comcast.net/~rbethman/ | +--+ | Bob Bethman\\\|/// The absence of a danger | | \\ ~ ~ // signal does *NOT* mean | | rbeth...@comcast.net (/ @ @ /) that everything is OK | +--o00o---°(_)°---o00o-+ __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Muting the R390 on transmit
Bob, I only see the R390A on the manual site. 73, John - Original Message From: John King k5...@yahoo.com To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Wed, December 2, 2009 2:22:11 PM Subject: Re: [AMRadio] Muting the R390 on transmit Thanks Bob, I will go there, 73, John, K5PGW - Original Message From: rbethman rbeth...@comcast.net To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Wed, December 2, 2009 2:20:36 PM Subject: Re: [AMRadio] Muting the R390 on transmit John, The manuals are on EDEBRIS. http://bama.edebris.com/manuals/military/r390/ Bob - N0DGN John King wrote: Thanks Larry. I have switched the break in to ON and had no mute. I have 12.95 vac at terminal 9 on the terminal board on the rear of the rcvr with the break in switch on and 1.68 vac at terminal 9 when the switch is off. 73, John, K5PGW - Original Message From: Larry Szendrei n...@securespeed.us To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Wed, December 2, 2009 1:43:22 PM Subject: Re: [AMRadio] Muting the R390 on transmit Thanks for the reply, Grant. My R 390 doesn't mute when terminal 9 is grounded. I have connected an alligator clip lead to terminal 9 and then connected the other end of the clip lead to terminal 16 which is ground and there is no effect. I can't figure out why there is no effect when terminal 9 is grounded. What do you think, Grant? I do not have a manual or schematic for the R390. 73, John, K5PGW You didn't mention whether the Break In switch was on, which, as Grant said, must be for it (=grounding the break-in terminal) to mute the receiver. Or, maybe there is a problem in that circuit in your R390. I used this function on my R390/URR, and it worked exactly as Grant described. 73/GL, -Larry/NE1S -- +--+ | AM Amateur Radio OperatorNØDGN | +--+ | http://home.comcast.net/~rbethman/ | +--+ | Bob Bethman\\\|/// The absence of a danger | | \\ ~ ~ // signal does *NOT* mean | | rbeth...@comcast.net (/ @ @ /) that everything is OK | +--o00o---°(_)°---o00o-+ __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[AMRadio] Muting the R390 on transmit
Does anyone know the hookup for muting the R390 during transmit? Your input will be appreciated. Thanks and 73, John, K5PGW __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Muting the R390 on transmit
Thanks for the reply, Grant. My R 390 doesn't mute when terminal 9 is grounded. I have connected an alligator clip lead to terminal 9 and then connected the other end of the clip lead to terminal 16 which is ground and there is no effect. I can't figure out why there is no effect when terminal 9 is grounded. What do you think, Grant? I do not have a manual or schematic for the R390. 73, John, K5PGW - Original Message From: Grant Youngman n...@tx.rr.com To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Tue, December 1, 2009 9:19:05 PM Subject: Re: [AMRadio] Muting the R390 on transmit It's terminal 9 (first terminal on the left) of the rightmost terminal block (looking from the rear of the radio), marked BRK IN. Ground this terminal to mute the receiver when the Break In switch is set to ON. Grant/NQ5T On Dec 1, 2009, at 8:51 PM, Brett Gazdzinski wrote: Its been a while since I had mine, but think there were terminals on the back marked 'mute'. __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] IS BAMA WEBSITE NO MORE???
I think that they had a major problem and have been re building for qoite a while. I just used this link to download the Valiant construction manual. http://bama.edebris.com/manuals/ 73, John K6HSG - Original Message - From: Van K7VS wa7...@cdsnet.net To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Friday, November 20, 2009 5:05 PM Subject: [AMRadio] IS BAMA WEBSITE NO MORE??? I KEEP GETTING KICKED BACK WITH BAD WEBSITE. DID THEY GO AWAY?? VAN -- I am using the free version of SPAMfighter. We are a community of 6 million users fighting spam. SPAMfighter has removed 2884 of my spam emails to date. Get the free SPAMfighter here: http://www.spamfighter.com/len The Professional version does not have this message __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[AMRadio] Collins 618T system info wanted
Hello AMradioers: I just drug home (literally!) a Collins HF transciever system, designed for vehicular mounting. In it is the well-known 618T (RT 698/ARC-102); a 426T-1 inverter, and a 700B-2 TTY converter. Al this is in a big green submersible case/cabinet, with a 313V-1 control head. The whole thing is: Reciever Transmitter Group 718F-1 I'm not a GreenRadio collector, but I am sort-of-basically familiar with the 618T, and somewhere I have the docs on the 700B. I'd like to have any thoughts, wisdom, cautions, etc about the radio and it's components... I'm thinking it might be fun to put it on the air, as several articles call out the good audio quality, both SSB and AM, and of course it's 400W PEP. I have no idea yet what to do with the lovely vehicle case... not planning on doing any off-road DXpeditions anytime soon. hihi.. I'd welcome any and all comments on this radio, on the list or privately. I don't know much about the system as a whole. I'll post this to the Boatanchors list as well - but I'm not all that keen on subscribing to any mil- or green- radio lists, too much in my inbox as it is. If you'd like to crosspost this to one of those, please do - but direct replies to me personally. Cheers John KB6SCO Carson City __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[AMRadio] Reactance Calculator
Found this recently http://www.indianabiomedical.com/Calculator/XLCcalculator.html John __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] I need som advice
That 290-262 looks like a nice deal Bob, I may have to get a couple for replacements in some stuff around here. John, WA5BXO -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of Robert Nickels Sent: Monday, October 19, 2009 7:17 PM To: Discussion of AM Radio in the Amateur Service Subject: Re: [AMRadio] I need som advice http://www.parts-express.com/pe/showdetl.cfm?Partnumber=290-262 While the frequency response of this $17 woofer is given as 74-5000 hz, it might sound pretty good. If you wanted more highs, you could try the approach used by Jensen and others who used to make full-range speakers by suspending a smaller PM speaker across the cone with a simple series capacitor crossover to handle the midrange frequencies. 73, Bob W9RAN __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] I need som advice
Hey Jim, ya might look at ceiling speakers to mount in the original enclosure. Even if smaller driver the ceiling mount may make up the diff and some of the modern speakers sound real good. Everything today is for a lot of power, as in guitar amps, that is what drives the price up. You can't just buy a 10 watt 10 inch speaker any more or they seem to be hard to find anyway. 73, John, WA5BXO __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[AMRadio] for sale or not for sale here
I cannot remember if it was this mail list or another. I want to post some items for sale related to AM ham radio. Can i do it here? 73 john K5PRO __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Any amplifier suggestions?
Todd, Typically the linear amp will be the fewer parts and expense but with less output than a full plate modulated class C rig per a given tube. One of the simplest tetrode linear systems is to put a 50 ohm load resistor right on the grid of a big jug like a 4-1000 or a pair of 4-400s and use a zener to bias the cathode circuit or fil return. It will also require a screen supply. The idea in all of this is that if the grid is loaded with a 50 ohm dummy load, then it will not require tuning. The small amount of input capacitance will be negligible on the lower freq bands. And it should not require neutralization. OTH, If you are going linear with a triode or triode connected tetrodes then you will want to go to a grounded grid linear. No screen supply, no neutralization, but does require more drive and/or may require drive tuning. You may expect very poor plate efficiency in any linier amp that is tuned properly to work with an AM input. If you're looking for old style circuits that are proven to have the most output with the least plate dissipation (smallest tubes) then plate modulated full class C finals with push pull class B modulators is best. More work more parts, but well worth the time and effort in the long run. My favorite in small legal limit stuff would be a pair of 812s push pull class C, modulated by a pair of 811a is class B. -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of Todd Carpenter Sent: Monday, October 05, 2009 9:30 AM To: AMRadio@mailman.qth.net Subject: [AMRadio] Any amplifier suggestions? I am interested is a simple design hf amplifier for am cw on 160-80/75-40. These are the bands i operate on where the extra power would help. Fewer parts count the better. Ultimately lower cost the better. I have power supply parts and believe that i can generate around 2000 volts. I am slowly researching tubes and am leaning toward 2 or 4 tubes that can basically generate lots of watts at half to two thirds their ratings to prolong their life span. Perhaps tubes such as 811's, 810's, 833's, 4-400's. I am open to suggestions. I will need to build or acquire a heavy duty matching system as part of the amp. My goal is at least 300 Watts AM. I do not want to mess with systems that require cooling other than fans. I am not interested in modes for this amp other than am and cw. It will almost exclusively be used for am as i rarely use more than 5 watts on cw any way. Simpler cheaper is better for me. I appreciate your suggestions. Todd __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[AMRadio] CCA AM 1000D
Thats not a Continental Electronics product. CCA was a company that went defunct about 15 years ago. There are some AM1000D's converted to AM, request on the AM forum. John K5PRO rescued a continental am-1000d but have no documentation--can anyone help? want to put on 1885 thanks jim ka4rfa __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Microphone recomendation
Very nice combination Don. Have you decided what those big triodes tubes are that I gave you, characteristics, etc., and speaking of Microphones have you found one of those connectors or a part number. As for the 12AX7s, I have always wondered if a guy could build a SS replacement with the same anode/drain characteristic curves or close as the 12AX7. FETs have a very high input resistance, They can be configure with a higher leak resistor than tubes without effecting the bias because they don't have the contact or collision bias effect. They don't have the typical triode curves, but are more like a pentode curve set (constant current set as it is sometimes called). It may be possible to correct this through feedback biasing or depending on the circuit it will be used in, it may not matter. They may also require some over voltage protection to prevent breakdown when someone plugs in a microphone and a high pulse is placed on the input. I feel that all of these things can be overcome and good product resulting. I can see it now SS-AX7 by Matsumushisomma Maybe I'm behind and it is already here! John __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Power Transformer as Mod Transformer (was: Seventy Fiver)
That is a great article Brian, and Lee. I have done this a long time ago. They work really well especially with the choke. They also make pretty good output XFMRS for HiFi and PA. The old 200 watt XFMRs we once saw in the old TVs are not as available as they once were. Prior to the Switch Mode solid state supply that Modern TV use, but after the big XFMRs and the 5U4s, there was a lot of constant voltage XFMRs in TVs especially the hybrids. These are recognizable because they were always accompanied with a 2-10 MF 600V capacitor in a can, possibly oil filled, used on the saturation winding of the XFMR. I have found them to make very good regulators for RCVRs, VFO, etc. They will maintain the supply voltage constant to the VFO plate and heater even if the mains drop to 100V when a big rig is key to XMIT. This way you don't slide up the band while XMITing. John, WA5BXO -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of Bry Carling Sent: Thursday, September 24, 2009 4:50 AM To: glowb...@piobaire.mines.uidaho.edu Cc: flboatanch...@yahoogroups.com; Discussion of AM Radio in the Amateur Service Subject: [AMRadio] Power Transformer as Mod Transformer (was: Seventy Fiver) There is a great article on how to use power transformers like that - as a mod transformer - available on line for free - by Tim, WA1HLR I hope it helps you - http://www.amwindow.org/tech/htm/tvtomod.htm LEE, W0VT writes: I went to Lowe's this evening and picked up some oak lumber to build up some Slat Board Transmitters. (They sell oak down to 1/4 inch thick to be used for the slats. I plan to screw the slats to the main oak end panels with brass screws and then stain and polyurethane the wood. I plan to build up one chassis as a 6V6 oscillator with pi-net. Another with a 6AG7 with pi-net. Then compair the output of the two plus check crystal current on both of them. Then I plan to build up another one with a 6AG7 osc and 6L6 amp with pi-net and plug in coils. Then I plan to build power supplies for these on slat board chassis and maybe use 5R4 rectifiers as I have some of these around here. Then maybe a modulator for the 6AG7/6L6 rig. For a modulation transformer I am thinking of trying a 70 volt or 25 volt line transformer or/and a power transformer having it's core restacked in E and I configuration with a gap between the two. The projects won't cost much and I think they will be great looking. I'll use broadcast band variable caps in the pi networks. (Duals for loading and singles for the tank circuit.). Maybe use some rigid clear plastic tubing over old tube sockets for the plug in coils. Lee, w0vt - Original Message - From: Charlie , W5COV To: glowb...@piobaire.mines.uidaho.edu Sent: Wednesday, September 23, 2009 9:04 PM Subject: GB Seventy Fiver Group , the topic came up a while back with thoughts of building a 75 meter version of the Twoer etc. Heath line . Did it fall by the way , because of a lack of interest , or did anyone do any type of development on something like this ? I am ALWAYS looking for a glowbug project to build , that isn't real complex and won't break the bank. A transceiver to put on the air would be a nice project . I have a bench overflowing with homebrew transmitters , mostly CW . Being on a fixed income , I like projects that parts can be readily obtained for at cheap prices . With my medical problems , I lack the design ability , that I used to have . The medications and disease cause a technical medical term called brain fog . So I depend HEAVILY , almost exclusively ,on other peoples designs . So if you know of a simple transceiver design that glows and is AM , please point me to it . Thanks for allowing me to be a part of the best group I belong to !! 73, Charlie , W5COV __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send
Re: [AMRadio] MCM Electronics digital multimeter for $2.99
Greetings Using the promo code 99RC1. I was just able to order three at the sale price. John Flood KB1FQG __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] SX-28 Cabinet wrinkle finish - in progress...
Bill, Are you ok? I think that you may have had a brain fart right there in the middle of your message. I am redoing the Par-Metal cabinet that my 50's 813 rig goes in and sprayed the base with Rust-oleum 7220 textured black paint. It came out looking like the finish on my 32V2 cabinet. Darker black but pretty much the same texture. Not wrinkle by any means. I used a belt sander on one of the three panels and discovered that they are any thing but flat. I guess that the wrinkle and textured finishes of old were used to hid the blemishes. 73, John Kc0yai Soon to be back to k6hsg - Original Message - From: BILL GUYGER bguy...@sbcglobal.net To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Tuesday, September 15, 2009 10:51 AM Subject: Re: [AMRadio] SX-28 Cabinet wrinkle finish - in progress... Not to be argumentative, but Krylon wrinkle does work on primered surfaces. I always paint aluminum rack panels first with a self etching primer and then the wrinkle paint. With aluminum you must absolutely use primer either self etching or Zinc Chromate (which by the way the state of California has determined causes cancer of course they have determined that everything causes some harmful effect so therefore you are not responsible for your own actions since you are a victim of pollution, Republicans, Christians, Conservatives or other right wing extremists like Thomas Jefferson, James Mason, Patrick Henry and the like) or the finish coat will not stick. Besides putting three fairly heavy coats of paint on at 10 -15 minute intervals, heat is the key to getting a good wrinkle finish. I've gotten the best results by setting the panels out in the sun on a hot day. Heat lamps or Quartz work lamps should work well too. 73 Bill AD5OL From: Mark Foltarz folt...@rocketmail.com To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Monday, September 14, 2009 7:04:57 PM Subject: Re: [AMRadio] SX-28 Cabinet wrinkle finish - in progress... Brian, Strip the primer off. Krylon wrinkle will not wrinkle on a primed surface. I think that info is on the can in super tiny letters right next to the Spanish, German, Italian and Boswanan ( Nothern dialect) translations. I ran into that problem with a nicely primed rack panel and ended up with a nicely painted glossy black panel. Stripped off the paint and started again with no primer. Worked great. Your radio is looking real good ! de KA4JVY Mark - Original Message From: WA5AM ars.w5...@gmail.com To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Monday, September 14, 2009 6:39:49 PM Subject: Re: [AMRadio] SX-28 Cabinet wrinkle finish - in progress... Hey Todd, Yes, it's Krylon wrinkle. I've found that the thicker you can lay it on, the better the wrinkle. In order to do that, I've had to paint one side at a time, keeping the target flat so it won't run. It's working great except the lid on this case has something embedded in the metal that has given me grief. I noticed it when I primed it. Will not take an even coat no matter what I do, as if it's wanting to repel the paint. It's only the lid and that's what puzzles me. I will get it best I can, but I can see the lid will not be what I wanted. Oh well, it will look much better than it did. 73 Brian / wa5am On Mon, Sep 14, 2009 at 6:16 PM, Todd, KA1KAQ wrote: I forget, Brian - is that a rattle can black (VHT or such)? Looks like you're getting plenty of wrinkle, and the gray overspray will even things out nicely. Someday I'll get into mine for a thorough recap and realignment. Time is still an issue. Can't wait to see the final result all packaged up. ~ Todd, KA1KAQ/4 __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[AMRadio] Diathermy tube for Fischer
Dave As W7TFO correctly pointed out, Fischer was a long time diathermy machine manufacturer. Like others, they had their own OEM part numbers printed on their tubes, made by other companies. My Aloe Short Wave Unit diathermy device has Amperex A11 triodes in it though. They have shorter plates than the Fischer tube you pictured, must be lower power. 73 John K5PRO Message: 1 Date: Thu, 10 Sep 2009 11:17:30 -0700 From: David Hollander n...@cox.net Subject: [AMRadio] Fischer Transmitting Tube I have a tube that I thought was an old Taylor tube. Marked on the glass is Fischer Chicago, Illinois and the tube number is 3581. Looks like an 805 but a bit larger. Here is a picture. http://members.cox.net/radiostuff9/358fisher.jpg Anyone ever heard of the Fischer Tube company? A google search turned up nothing. Tnx and 73, Dave N7RK __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Hallicrafters R-12 speaker
I agree Bob. Maybe Brian intends to put a pair of 805 between the receiver and the speaker and play some guitar. At any rate I'm sure he has his reasons. I might go with this one (http://www.parts-express.com/pe/showdetl.cfm?Partnumber=290-486), and even it is an over kill but selection of 12 inch speakers with less than a 20 watt rating are few and far between. Many times I will cut a board to fit where the speaker goes and then mount a smaller speaker to the board. In most cases the smaller speaker has better sound due to modern manufacturing and tech specs than the older one. http://www.parts-express.com/pe/showdetl.cfm?Partnumber=290-486 73, John -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of Bob Peters Sent: Friday, September 04, 2009 6:02 PM To: 'Discussion of AM Radio in the Amateur Service' Subject: Re: [AMRadio] Hallicrafters R-12 speaker WOW That is way overkill for Ham Radio ...Bob -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of WA5AM Sent: Friday, September 04, 2009 5:45 PM To: Discussion of AM Radio in the Amateur Service Subject: Re: [AMRadio] Hallicrafters R-12 speaker This one here: http://www.parts-express.com/pe/pshowdetl.cfm?DID =7Partnumber=290-834ctab=2#Tabs 73 Brian On 9/4/09, John Coleman j...@pctechref.com wrote: I'm curious Brian, what is the one that you intend to get? John, WA5BXO -Original Message- From: amradio-boun...@mailman.qth.net [mailto: amradio-boun...@mailman.qth.net] On Behalf Of WA5AM Sent: Friday, September 04, 2009 4:42 PM To: Discussion of AM Radio in the Amateur Service Subject: Re: [AMRadio] Hallicrafters R-12 speaker Thanks John. They appear to have one that will work very well, and the price on their speakers is darn good! 73 Brian On 9/4/09, John Coleman j...@pctechref.com wrote: Brian I buy most speakers from Parts Express. They have a lot of audio parts and equipment. (http://www.parts-express.com) Good Luck John, WA5BXO __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amra...@mailman.qth.ne t/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html -- Brian Sherrod, PA My website: http://w5ami.net Arkansas Amateur Community Forums - http://w5ami.net/forums wa...@arrl.net __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amra...@mailman.qth.ne t/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amra...@mailman.qth.ne t/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html -- Brian Sherrod, PA My website: http://w5ami.net Arkansas Amateur Community Forums - http://w5ami.net/forums wa...@arrl.net __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amra...@mailman.qth.ne t/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net
[AMRadio] Test
Please excuse and ignore - test new email provider __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Hallicrafters R-12 speaker
Brian I buy most speakers from Parts Express. They have a lot of audio parts and equipment. (http://www.parts-express.com) Good Luck John, WA5BXO __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Hallicrafters R-12 speaker
who did the restoration of the SX 28A shown in the pictures in the link? Thanks and 73, John, K5PGW --- On Fri, 9/4/09, John Coleman j...@pctechref.com wrote: From: John Coleman j...@pctechref.com Subject: Re: [AMRadio] Hallicrafters R-12 speaker To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Date: Friday, September 4, 2009, 5:18 AM Brian I buy most speakers from Parts Express. They have a lot of audio parts and equipment. (http://www.parts-express.com) Good Luck John, WA5BXO __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Hallicrafters R-12 speaker
Thanks Brian. That is a beautiful job!!! I have a nice but kinda dirty SX 28 A back home in Louisiana that I am going to restore when I return to Louisiana from NW Montana in about three weeks. I am not going to quiz you now because I know many others will be doing so. Will you be at Belton? Barbara and I will be there and I hope to meet you. We park on the side of the expo building in an Alfa See ya Coach. we will be there Thursday afternoon or Friday morning. 73, John, K5PGW --- On Fri, 9/4/09, WA5AM ars.w5...@gmail.com wrote: From: WA5AM ars.w5...@gmail.com Subject: Re: [AMRadio] Hallicrafters R-12 speaker To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Date: Friday, September 4, 2009, 6:18 AM If you are referring to the link posted yesterday, that's me, wa5am/brian. 73 On 9/4/09, John King k5...@yahoo.com wrote: who did the restoration of the SX 28A shown in the pictures in the link? Thanks and 73, John, K5PGW --- On Fri, 9/4/09, John Coleman j...@pctechref.com wrote: From: John Coleman j...@pctechref.com Subject: Re: [AMRadio] Hallicrafters R-12 speaker To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Date: Friday, September 4, 2009, 5:18 AM Brian I buy most speakers from Parts Express. They have a lot of audio parts and equipment. (http://www.parts-express.com) Good Luck John, WA5BXO __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html -- Brian Sherrod, PA My website: http://w5ami.net Arkansas Amateur Community Forums - http://w5ami.net/forums wa...@arrl.net __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Hallicrafters R-12 speaker
I'm curious Brian, what is the one that you intend to get? John, WA5BXO -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of WA5AM Sent: Friday, September 04, 2009 4:42 PM To: Discussion of AM Radio in the Amateur Service Subject: Re: [AMRadio] Hallicrafters R-12 speaker Thanks John. They appear to have one that will work very well, and the price on their speakers is darn good! 73 Brian On 9/4/09, John Coleman j...@pctechref.com wrote: Brian I buy most speakers from Parts Express. They have a lot of audio parts and equipment. (http://www.parts-express.com) Good Luck John, WA5BXO __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html -- Brian Sherrod, PA My website: http://w5ami.net Arkansas Amateur Community Forums - http://w5ami.net/forums wa...@arrl.net __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[AMRadio] Hallicrafters PM 23
I have a Hallicrafters PM 23 speaker that matches my SX 28A but it needs rust removal and refinishing. I would appreciate pictures and methods used to re-finish my PM 23 if anyone has specific information based on experience. I know that W8UT has worked on the PM 23 and I have communicated with him on that point. Does anyone have a silkscreen to re print the Green Hallicrafters printing on the face of the PM 23? Your assistance will be greatly appreciated and you may email me direct. Thanks and 73, John, K5PGW __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[AMRadio] Correction of my post
CORRECTION... I have both the PM 23 and R42 that need refinishing. I got them mixed up and it is the R 42 that will need re-lettering on the front in the Hallicrafters green lettering. I noticed my error just before I received Bob Bethman's email . Thanks Bob. 73, John, K5PGW __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Other Classic Rigs on Television
Glass Bottom Boat with Arthur Godfrey, who was a ham. 73, John Dilks, K2TQN At 05:38 PM 9/1/2009, you wrote: There is also an old Doris Day movie in which she is shown talking on an S line. I don't remember the name of it. __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] 100TH and 250TH advice and or comment
I think bringing filaments up slow is a good idea. At one time we used a varister device in the degaussing circuit of the old TVs. These little round resistors would have about 100 ohms resistance when cold but would go down to a tenth of an ohm or less when hot. They make a very good auto starter for heaters. I use them in the primary of the filament XFMRs. But for long periods of setting a variac might be best. 73 John -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of crawf...@surfmore.net Sent: Tuesday, August 25, 2009 9:43 PM To: Discussion of AM Radio in the Amateur Service Subject: Re: [AMRadio] 100TH and 250TH advice and or comment John Mohn was W5MEU. I remember him talking about that one night over 20 years ago.I have an old 450TL that I want to use. I guess I need to bring it up slowly with a variac feeding the filament transformer to keep the inrush current from wrecking the filament, or is that an issue? Joe W4AAB I think there is at least some truth to this Lee, but I am not sure of why. By the same token though I have run 250ths for quite some time and with many hours of no use both winter and summer without air conditioning. They seem to always work the same even though I may only fire them up once or twice a year (much to my dismay). So I really don't have any good answer for this. If all the tubes in question were assemble into the 610 at the same time then maybe you could just pass this off as it was finally time that the air leak got to them. Don, K4KYV and Tim, WA1HLR have discussed this sort of thing quite a bit as well as deterioration of cathode coatings in both directly heated tubes and indirectly heated tubes. You may want to consult with them about this. One thing is for certain, if the final tube is weak then it will be very difficult to get it to produce a wave form output that matches the audio wave form, and it gets worse as the power demand goes up. 73 John -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of LEE BAHR Sent: Tuesday, August 25, 2009 2:20 PM To: Discussion of AM Radio in the Amateur Service Subject: Re: [AMRadio] 100TH and 250TH advice and or comment John Moan (forgot his call and spelling) (SK) in San Antonio used to run a few BC-610s. He always rotated his 100TH and 250TH tubes to keep gassing from forming in them. He had about a dozen BC-610s and around 17 R-390A receivers in his shack. I think he used to say it was bad to lie them on their side too. He seemed to know what he was doing and swore the cycling of the tubes was neccessary to keep them alive. He claimed storing these tubes would kill them in time. I am only talking about 100TH and 250TH tubes. Lee w0vt Houston __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] 100TH and 250TH advice and or comment
Do they show color on the plates or gas type ionization color when in use? If they show gas ionization color when in use then they defiantly have air in them and could be caused by overheating due to some malfunction. Maybe they have many more hours on them than you know about. If the plates or just a little red but no gas ionization then the tubes or probably OK. Make sure the grid drive stays up at the recommended level and one way to tell if a tube is losing its conduction is to check the grid drive. If the grid drive falls off considerably when the plate supply is energized then the tube is getting weak. A small amount of grid current fall is normal. The neutralization must be very good to make this check else capacitive feedback will affect your findings. I have used 250ths for some time and have never seen them loose vacuum from any normal use. I did crack one once taking the grid connector off. That was a little heartbreak. Especially when Geoff W5OMR was te lling me to be careful. HIHI 73 John, WA5BXO -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of rbethman Sent: Tuesday, August 25, 2009 11:07 AM To: AM Radio List Subject: [AMRadio] 100TH and 250TH advice and or comment Question: I have noticed that the 100THs and 250THS that are in their original boxes, either not used at all, or maybe use for less than an hour to test them, seem to be doing fine. Their envelopes are crystal clear an can not see any sort of defect. Then the ones that are in one of the two BC-610s that has the hours on it, even though it last performed flawlessly, now appears to have gone gassy with some milky white inside the envelope. Is this perhaps due to over heating or maybe I should phrase this as the convection cooling of these radios since they do NOT have fans. Ideas? Comments? It has always been metered and watched with a scope for observing waveforms, and the wattmeter is the newer Model Bird with peak reading built-in. (However true they really are!) Bob - N0DGN __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] 100TH and 250TH advice and or comment
I think there is at least some truth to this Lee, but I am not sure of why. By the same token though I have run 250ths for quite some time and with many hours of no use both winter and summer without air conditioning. They seem to always work the same even though I may only fire them up once or twice a year (much to my dismay). So I really don't have any good answer for this. If all the tubes in question were assemble into the 610 at the same time then maybe you could just pass this off as it was finally time that the air leak got to them. Don, K4KYV and Tim, WA1HLR have discussed this sort of thing quite a bit as well as deterioration of cathode coatings in both directly heated tubes and indirectly heated tubes. You may want to consult with them about this. One thing is for certain, if the final tube is weak then it will be very difficult to get it to produce a wave form output that matches the audio wave form, and it gets worse as the power demand goes up. 73 John -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of LEE BAHR Sent: Tuesday, August 25, 2009 2:20 PM To: Discussion of AM Radio in the Amateur Service Subject: Re: [AMRadio] 100TH and 250TH advice and or comment John Moan (forgot his call and spelling) (SK) in San Antonio used to run a few BC-610s. He always rotated his 100TH and 250TH tubes to keep gassing from forming in them. He had about a dozen BC-610s and around 17 R-390A receivers in his shack. I think he used to say it was bad to lie them on their side too. He seemed to know what he was doing and swore the cycling of the tubes was neccessary to keep them alive. He claimed storing these tubes would kill them in time. I am only talking about 100TH and 250TH tubes. Lee w0vt Houston __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Classic Link Coupled Tuner
Hi Brian: Next time we come up there I will be sure to give you some notice. But I had already taken a side trip to Don's, K4KYV, to get rid of some stuff. I was needing to spend some time with the kids there in Searcy. If you are getting a good match and there is no heating then the energy from the XMTR must be getting to the antenna. I would worry too much about it all. But it sounds like you have the same brain disease that I have, CAN'T STAND TO NOT KNOW WHY. I must have spent weeks studying and experimenting with this matching stuff and neutralizing circuits, don't even get me started. HIHI One thing I have found is that the breadboard design is the best for changing and learning and the shot glass can be used for an insulator or to ease the frustration, which comes often for me. While on the subject, I must tell you of an experiment I did some time back (25 years ago). I put a 6AL5 tube in the top box of a Heath Cantenna and lit it up with a 6V lantern battery. Using only one diode, I connected the plate directly to the dummy load and the cathode was by passed to ground with a .01uf ceramic capacitor and then connected to the little RCA jack on the top box. Now I had a decent peak reading RF detector. I just measure the DC on the RCA jack to indicated the peak of the RF voltage (very accurate by the way, but that's another story). I took 60 ft of open wire balanced line made of #12 wire with Phenolic spacers about every foot and stretched it out across the back yard suspended by wood chairs and such. The dummy load RF detector was then attached to the far end. I had the balanced antenna tuner connected to the feed end and a SWR meter between the tuner and the XMTR. I adjusted the tuner so that running 800 watts and with the SWR meter sensit ivity all the way up it showed nothing on the reflective meter. I then took my Simpson meter out to the dummy load and measured the voltage at the output of the 6AL5 RF detector. I of course don't remember the exact voltage but let's say about 250V DC. Then I connected 100 Ft of RG8 to the dummy load and the other end to the SWR meter. The SWR meter still show flat but the RF detector meter showed less voltage, not much less but something like 240V. I thought maybe I have made a slipup somewhere so I when through all the procedures again making sure that I disconnected the battery from the 6AL5 when not measuring so as not to have the filament voltage going down in between measuring. I got the same results each time. So I was finally convinced that the losses in a good tuner are negligible and the looses of coax far exceed the losses of open wire line. John, WA5BXO __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Classic Link Coupled Tuner
Brian: In a link coupled assembly the coupling actually has an effect on the Q, the effective load. But increasing the Q of a parallel tank (less coil more capacitance) will increase the coupling. Using taps on the coil for the antenna connections reduces the coupling while increasing the Q. The fewer turns there are between the antenna connections the greater the Q of the tank but less voltage is coupled to the antenna. The coupling between the link and the main tank increases because the Q of the main tank went up as it was loaded less. The voltage across the ends of the main tank will go up as the taps are moved towards the center. You can get a different run of coupling by tuning the link in parallel instead of series. But this will double the voltage across the link capacitor. You can get yet another run of different coupling factors by using a swinging link. It all boils down to this: The tuner should be adjusted so that there is no L or C reactance at the antenna terminals. Then the coupling is adjusted to pull the current from the rig so that Erf/Irf = desired Z-load (generally 50 ohms). If the Q of the circuit is not high enough you will not be able to couple enough energy out of the XMTR to draw enough RF current to get the desire E/I (LOAD resistance) low enough. If the Q is too high in the wrong place then the circulating currents in the tanks of the tuner will either have high loss or begin arcing. If it aint getin hot and it aint arcin then it's OK. There always a number of ways to do it. BTW: I was in your neck of the woods a couple of weeks ago visiting with Kids in Searcy and drove out to the Peti-Jean park. I guess we must have gone right by you place. 73 John, WA5BXO -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of WA5AM Sent: Saturday, August 15, 2009 5:06 AM To: Discussion of AM Radio in the Amateur Service Subject: [AMRadio] Classic Link Coupled Tuner I'm bumfuzzled... This is not exactly AM, but I use an AM tx with it... Several years ago, I built a large link coupled tuner from parts I managed to get off ebay. A large coil with rotating link in center which came out of a vintage BC transmitter, and a large Johnson split stator variable, about 35 to 475 pF. I breadboarded these two components together and have been using it since on 75 and 40 meters with great results using 450 ohm ladder line to a doublet cut for 75 meters. After I built this, I found tapping points on the main coil that worked well on 75, ultimately giving me a standing wave of near perfect on a given freq. I did that simply by trial and error... About two years ago I purchased an inductance/capacitance meter. Never thought to measure the coil taps on the tuner with it, etc., until yesterday. I disconnected the cap, coil and feedline from one another and checked the inductance of the main coil where I had my 75 meter taps. To my surprize it was only ~7.2 uH!! For the heck of it, I measured the variable in the range it normally is adjusted to and it showed about 220pF. According to formula, my values do have a resonant value near the upper end of 75 meters, and in real life do well around 3.885Mhz with my conditions. Looking at other tuners, homebrew and commercial, it appears most will tap a balanced coil like this at about 22uH and set a capacitance at around 75 pF to get resonance on 75 meters. Since I have plenty of coil on this, I did exactly that and can not get anywhere near where I need to on my tuner. What gives?? As a reference; the lowest SWR I could achive was about 5:1, and there was a noticeable attenuation on rx too. Since I can get it to work just fine with my original 7.2uH tap, it really is no big deal to me, but I am curious why others I've seen use (and can use) a lot more inductance. I know using more C gives better 'Q', but why is my real life parameters so far from the norm, and why will it not tune using the normal parameters of L and C? There must be something not right on feedline length, or the length of the doublet itself, maybe? By the way, the measured inductance of the link coil is about 3uH. One other thing I've noticed is that many seem to indicate the variable is paralleled to the entire length of the coil, not directly to the points where it is tapped for a given band. See this diagram: http://www.possumnet.com/Graphics/Diagram.jpg I don't do this. My variable is is paralleled directly to the feedline taps. 73 Brian / wa5am __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio
Re: [AMRadio] Classic Link Coupled Tuner
Thanks Bob Just to add a little something: Someone said earlier, something to the effect, that there may be a non resonate antenna and feed line combination that can cause a lot of trouble. This is very true because then the L and C of the tuner must add or subtract reactance in order to make the whole system resonate. This is often more easily done when you have a lot of capacitance to work with. So having a high Q tank in the tuner has its advantages. John, WA5BXO -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of rbethman Sent: Saturday, August 15, 2009 12:20 PM To: Discussion of AM Radio in the Amateur Service Subject: Re: [AMRadio] Classic Link Coupled Tuner Thank you John! __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Viking I
I am curious as to just why they want a specific model, the Viking 1? Just curious. 73, John, K5PGW --- On Fri, 8/14/09, David McClafferty ve1...@yahoo.ca wrote: From: David McClafferty ve1...@yahoo.ca Subject: [AMRadio] Viking I To: amradio@mailman.qth.net Date: Friday, August 14, 2009, 5:43 AM A commitee is looking for a Viking I to be presented to the King of Thailand, HS1A. A unit closest to a Thai embassy, I'm told, would be most convenient for shipping, arrangements, etc. If you have one that your willing to part with contact VE7HA/1 at ve...@arrl.net Dave, VE1ADH __ Make your browsing faster, safer, and easier with the new Internet Explorer® 8. Optimized for Yahoo! Get it Now for Free! at http://downloads.yahoo.com/ca/internetexplorer/ __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Odd tuning on 160M
Mike, I suspect that stray RF is getting to the auto tune circuits if it is indeed an autotune tuner. Sounds like RF peaks in the Amp might be upsetting the applecart. Grounding can be a PROBLEM if you have ground loops. However, I would suspect stray RF since it seems to happen when QSOing as opposed to during tune. The RF level is probably mostly constant in tune as opposed to higher peaks when pulsing with modulation peaks or CW peaks. I have also had more problems with stray RF using solid state exciters than tube finals with pi network or Pi L network. I once had a solid state exciter driving a SB 220 and at times a Collins 30S1 and the feed back from the amp to the exciter would sometimes cause the whole thing to go into oscillation during tune up. Since you do not have the problem with the AMP out of the line, I suspect high RF fields caused by the high power Amp GUMMING up the works. You might try changing the lengths of feedline on 160 and 80 to see if placing the voltage and current nodes at different spots might help the problem. Another feeble suggestion might be a balun in the feedline. you might be saturating the balun inside the tuner. I think I would try a different exciter, if possible, and maybe one with tube tube finals. Harmonic suppression may be better as well as stray RF with tube finals and a different output circuit. If that doesn't help, then you might try a different type amplifier. may have to borrow one. Checking the interconnecting Coax cables would not be a bad idea either. Mike, the answer is, I JUST DON'T KNOW!! I am just thinking outloud and hoping I hit on an idea for you. Good luck and 73, John, K5PGW --- On Sat, 7/18/09, M. K. Hess mkh...@kias.org wrote: From: M. K. Hess mkh...@kias.org Subject: [AMRadio] Odd tuning on 160M To: amradio@mailman.qth.net Date: Saturday, July 18, 2009, 9:16 AM Hi Folks, Here's a question that may need to get filed under dumb, or maybe not, but here goes! I have a V-Beam, a Vertical, and a Dipole, all capable of 160M operation. I use a K3 as my exciter, an Alpha 91B as an Amp, and a Palstar AT-Auto for the tuner. The following happens with any of these antennas, including my dummy load (Heath CanTenna)... I have the Alpha in Stby, and key up the K3 w/ 10w through the Palstar to whatever load If finds a 1:1 match and all is well. If I advance the K3 to 120W all remains well... Can Xmit all day and night, without issue. NOW I fire up the Alpha 91B, and begin to tune it after a couple of seconds, the Palstar starts to re-tune the load. I wait until it settles, and start the Alpha load again, same thing... this happens a few times until finally the Palstar thinks it's got a match, AND the Alpha thinks it's happily loaded... Finally, I hear someone calling I call back... as I'm talking, the Palstar starts re-tuning again and the Alpha usually goes into Hi-SWR shutdown... I fiddle with them for a bit, and try the call again Sometimes it stays stable, most times it goes haywire several times during the QSO... WTF is going on!?!?!?! I have grounding out the ying-yang, and no RF back to the station, I have heavy duty parts from the shack to the antennas.. (See my web www.n3eaq.net for details) This mostly seems to happen on 160 and 80 and DEFINITELY on 1885 when I'm trying to do AM! Any ideas!?!?!?! All help is appreciated! Mike - N3EAQ __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] MJ comments
Thanks Brian! 73.. John WB5CW -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of Bob Peters Sent: Wednesday, July 01, 2009 7:28 AM To: 'Discussion of AM Radio in the Amateur Service' Subject: Re: [AMRadio] MJ comments Thank you Brian... I was about ready to say the same thing...Was getting sick of seeing it... Bob W1PE Moderator- AM Radio List -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of WA5AM Sent: Wednesday, July 01, 2009 9:11 AM To: Discussion of AM Radio in the Amateur Service Subject: Re: [AMRadio] MJ comments This list has gone very long with little problems compared to some others. One reason is the professionalism of most all the members, and the moderators. To see a warning by one of the moderators ignored, more than once, really gets under my skin. From this point forward, if any moderator, or myself issues a warning about any post, and the subject is repeated by ANYONE else, or the original poster, ignoring the warning, that poster will be banned permanently. I plan to ban a few today... If you just can not resist the urge to post crap like this on a ham radio related list, I will ban you! Pure and simple! Go somewhere else with your urge. We have too many valuable posters on our list that get tired of seeing these sort of things where they don't expect it, and I DO NOT want to lose those guys because someone else has nothing but this sort of junk to bloviate about. 73 Brian / wa5am Administrator - AM Radio List __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amra...@mailman.qth.ne t/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[AMRadio] OT: Another BC transmitter saved
Three weeks ago (been busy, forgot to post) I and Dave WB6GEF rescued a 1957 RCA BTA-500MX AM transmitter from being scrapped - the old girl is now safe in my shack waiting clean-up and re-tuning for 160/75. It is 500W output, single 833 modulated by a pair of 833s, with 807s for all the rest of the signal chains, and 866s/8008s for making DC. We had to remove a door and half of the door jamb to get it out of the building Also cleaned out several 833s, a lot of leftover tape and cartridges, and 4 Collins turntables. Keep the Old Iron speaking! Cheers John KB6SCO Carson City, NV DM09fg __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] push pull output XFMRs and neg feedback
Hey Darrell; Some how I missed your post until just now but yes I did do the swap. John -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of WA5VGO Sent: Thursday, May 14, 2009 7:34 PM To: amradio@mailman.qth.net Subject: Re: [AMRadio] push pull output XFMRs and neg feedback Have you tried swapping the transformers to make sure it isn't something else? 73, Darrell, WA5VGO __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[AMRadio] Going to Memorial Day Hamfest Howard County Fair Grounds
Hi Gang, Cleaning out a storage unit.. Going to Memorial Day Hamfest Howard County Fair Grounds Taking For Sale there: Tubes, Rx Tx (some large) - and several large boxes of brand new tubes, Mil packages Have several RCA 50 Globe tubes 2 Big Modulation Xfmrs - 275 watt, drivers and medium size Power Transformers Meck T-60 transmitter in fair to poor condition, but rebuildable. S-40B rough cabinet, inside looks good HQ-100-C NC-270 SW-3 and SW-3 coil sets 3-large rolls of 1-1/4 hard line - cheap! High-end Tuner Rare speaker for RME-69 in good condition - $125 more And a big pile of donation and another with free stuff. Look for a Blue Ford Freestyle with an open trailer about 8 am. 73, John Dilks, K2TQN __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] push pull output XFMRs and neg feedback
OK Dennis: Give yourself a pat on the back. The output XFMR is the trouble. I was able to switch them out today and confirm that the channel that was bad is now good. So does anyone have one of these critters. The output XFMRs are Thordarson 22s63 5000 ohm ptp primary -- 8 and 16 ohm secondary -- rating 40 watts Maybe a pair of substitutes. I have a little extra room on the chassis if necessary. Contact me off list please -- wa5bxo at gmail dot com John Coleman, WA5BXO -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of John Coleman Sent: Thursday, May 21, 2009 9:18 AM To: Discussion of AM Radio in the Amateur Service Subject: Re: [AMRadio] push pull output XFMRs and neg feedback Jim: Open Loop: A square wave input at about 1000 HZ results in a square wave at the grids of the KT88s. Both channels appear equal in amplitude at the grids of the KT88s. But the output of the 8 ohms tap to the speakers is not a square wave but is sort of a pointed sine wave. And the good channel has a nearly twice the peak to peak voltage. As inverse feedback is added: As the inverse feedback is added, the good channel begins to flatten out into a square wave and looks pretty good with only a small amount of ring at the leading edge. However, When inverse feedback is added to the channel of question, the wave begins to flatten but goes into sustained ring at the top and bottom of the square wave. Adding just a little more FB and it breaks into oscillation. The one thing I haven't checked is switching the speakers. There may be some weird thing with the crossover networks making a resonate circuit there. It's easier than changing out the output XFMRs. I could try changing the KT88s as well. Now that would be weird!! Dennis said he thought it could be a shorted turn in the output XFMR, in spite of NOS, and it is beginning to look more and more true. I seem to always find the weird stuff. I serviced TVs for many years before going into the computer field. I have met and talked with many TV techs and not one of them has ever detected or changed out the main power supply choke in the old tube type sets. Yet I have found two in my life that were shorted. No inductance: Ripple was the same on both ends. So either the others guys just never fixed the ripple in the picture or they never saw it. John Coleman, WA5BXO __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] push pull output XFMRs and neg feedback
Jim: Open Loop: A square wave input at about 1000 HZ results in a square wave at the grids of the KT88s. Both channels appear equal in amplitude at the grids of the KT88s. But the output of the 8 ohms tap to the speakers is not a square wave but is sort of a pointed sine wave. And the good channel has a nearly twice the peak to peak voltage. As inverse feedback is added: As the inverse feedback is added, the good channel begins to flatten out into a square wave and looks pretty good with only a small amount of ring at the leading edge. However, When inverse feedback is added to the channel of question, the wave begins to flatten but goes into sustained ring at the top and bottom of the square wave. Adding just a little more FB and it breaks into oscillation. The one thing I haven't checked is switching the speakers. There may be some weird thing with the crossover networks making a resonate circuit there. It's easier than changing out the output XFMRs. I could try changing the KT88s as well. Now that would be weird!! Dennis said he thought it could be a shorted turn in the output XFMR, in spite of NOS, and it is beginning to look more and more true. I seem to always find the weird stuff. I serviced TVs for many years before going into the computer field. I have met and talked with many TV techs and not one of them has ever detected or changed out the main power supply choke in the old tube type sets. Yet I have found two in my life that were shorted. No inductance: Ripple was the same on both ends. So either the others guys just never fixed the ripple in the picture or they never saw it. John Coleman, WA5BXO __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] BC-610 fiasco Again
Well I don't take any credit for the fiasco, but that I model is my old BC-610. Looks good doesn't it? I picked it up new at the Andrews AFB MARS station back in '68, complete with all coils, plug-ins, spares, tuner and speech amp. It had just been uncrated. I used it with AF-MARS, on RTTY in Hampton, VA, at my rental home and again when I came back to NJ after my service time. (I was assigned to the MARS station at Langley, AFB. Great job! The AF moving company broke every step, in my rental, coming down from the second floor with that baby. It worked perfectly when it arrived in NJ.) Later, when I was building my new home and didn't have time or a place to store it, I gave it away to a local ham, who later sold it. Looking at it now, I wish I still had it. And NO, I don't intend to bid on it. 73, John Dilks, K2TQN At 12:28 AM 5/20/2009, James M. Walker wrote: Well it's back, and at a higher price than the last time. Maybe it's like aging fine wine! BC-610 you know where, Item number:200344030668 Jim WB2FCN What a Country __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Meter scale software
Maybe this is it. http://www.tonnesoftware.com/meterdownload.html Installation did not put and icon up, I had to go find the file meter.exe and run it. But it looks cool. John WA5BXO __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] push pull output XFMRs and neg feedback
Thanks Jim I'll give that a try before switching the XFMRs out. I guess what your saying is that the slight tolerance differences of components and layouts me be enough to cause this and that the XFMR wires are color coded different doesn't mean they or all wrong. In his schematic the resistor is 3300 ohms and the capacitor is .001 uf. The plate resistance of the 6SN7 is supposed to be about 7000 ohms. With this data, how does one calculate the roll off and how does the un-bypassed cathode resistor and feedback to that cathode effect the response. I have always done this sort of thing experimentally but I figure that someone with a degree may know the actual methods to calculate all of this. BTW the cathode resistor is 1000 ohms and the plate resistor is 47K. Thanks for the tip. John, WA5BXO __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] push pull output XFMRs and neg feedback
Jim I had a chance to add the 3300 ohm resistor and the .001uf capacitor to the circuit at the grid of the phase splitter but it did not help or if it did it was negligible. The oscillation is at 8000 to 1 cps. I think I had originally said 18000 but the scope says different and it is audible even for an old smell like me. BTW I don't have any pre-emphasis or de-emphasis in the FB path it is strictly a resistive pad. I'll be running some test soon and will let you know the results. BTW the output XFMRs are Thordarson 22S63 5000 ohm ptp primary -- 8 and 16 ohm secondary -- rating 40 watts John Coleman, WA5BXO -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of Jim Candela Sent: Friday, May 15, 2009 11:06 PM To: amradio@mailman.qth.net Subject: Re: [AMRadio] push pull output XFMRs and neg feedback John, I had similar issues with a stereo 6L6 amp I built many years ago. The oscillation would come and go, and it eventually killed the tweeters on my old Utah 12 3 ways. The following article describes the problem well in a similar amplifier: http://www.pmillett.com/file_downloads/chicago_100W_amp.pdf See R1, and C1, and description on paragraph 1 on page 63. I know you are experiencing the issue in only one channel. I bet if you swap transformers, the problem stays in that same channel. Adding the R1, C1 like the article might completely eliminate the problem. Here is a more updated circuit designed by Patrick Turner. He uses a transistor current source in the phase inverter such that he gets perfect balance: http://www.turneraudio.com.au/Integrated5050.htm Patrick talks a bit about stability, and ultrasonic oscillations. A good read, as is his whole website. Regards, Jim WD5JKO __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] push pull output XFMRs and neg feedback
No Darrell, I haven't swapped the XFMRs yet. That is part of the testing that will take place but it is all on hold for a few days because of Boy Scout events this week end. I'll keep you guys informed as to what is found. Come see us sometime Darrell. Bret, Yep I'm sure it is a phase problem and is probably in the XFMR. I fear they just aren't equal. But before I go to the trouble of swapping all the wires I am going to make phasing tests throughout the amplifier. It is only a few stages so it should not take long. But I can't get to it till next week. CU Later, 73 John, WA5BXO __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[AMRadio] push pull output XFMRs and neg feedback
This is maybe a little off subject here but I ran across an interesting thing. It may be of interest for someone building higher quality speech amplifiers of modulators for AM. While constructing two identical amplifier circuits with inverse feed back for a stereo operation, I discovered that the introduction of the feedback caused oscillations in one channel, so I checked my circuits to see if I had wired some part of the push pull drivers or something in the output different from the other circuit. I had not. But reversing the output XFMR plate wires did correct the trouble for the most part. Now here is what is interesting. These are standard old fashion Thordarson push pull OTs for 6L6s. It has three wires on the primary and three on the secondary. Primary is green=P1 Red=B+ Brown=P2. Secondary is Black=ground Brown=8ohm Green=16ohm. I checked the XFMR with the ohmmeter before ever wiring it in but I did not check its through put phase. But the XFMR primary has to be wired different (that is the Green and Brown wires of the primary must be reversed) in order for the feedback to be inverted as it should be. I said this corrected the trouble for the most part but not altogether. Now here is another phenomenon. I can increase the negative feedback, on the one amp that has always worked OK, to reduce the gain a lot with no oscillations. But on the other amp where I had to reverse the wires, I can only reduce the gain a small amount before the circuit goes into a high frequency (maybe 18000HZ) oscillation that is barely audible. If I put the wires back where I thought they should go, I get about a 500HZ oscillation immediately upon introduction of any feedback. The circuit is push pull KT88 grounded cathodes, 425 V plate supply, regulated 300volt screens, RC coupled grids with separate bias pots for each grid and set to about 40ma cathode current per tube. Grid leak resistor is 100K from grid to bias circuits. Diver is a differential 6SN7 with 47K plate resistors and with a cathode balance pot. Phase splitter is also 6SN7 - first plate is direct to grid of second triode. Cathode resistor and plate resistor for splitter is 22K. Appropriate B+ decoupling between stages. The feedback point is cathode resistor of first stage. Feedback take off is from 8ohm connection of output XFMR. Appropriate decoupling and divider between take off point and feedback point. This is a very common type of circuit used in many higher quality amplifiers. This one just doesn't have the ultra linear OTs with the screen taps and cathode windings. I may need to move swap the XFMRs from one channel to the other just to test or prove if it is the output XFMR that is causing all this. But before I do I will open the feedback loop and parallel the two channels inputs. Then do a low frequency test to make sure of my wiring phase all the way through both amp. I guess I will sync the on the input then go dual trace to look at the paths in each amplifier. Then start sweeping up input frequency to see where I get phase shifting that might cause this. Has anyone else found NIB / NOS XFMRS that don't match but are supposed to. May Thordarson just never intended these to be used with feedback and I just happened to find one that works OK but not the other. John Coleman, WA5BXO __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] push pull output XFMRs and neg feedback
That is a possibility Dennis however there is little if any difference in the open loop gain of the two circuits or their output level before clipping about (40 watts). I was thinking that perhaps the primary wires were color coded incorrectly, as I am nearly positive they are, and the secondary may be as well. As a result I may have the speakers tied to the 16ohm output and taking the feedback from there would be greatly different than the 8ohm connection. The XFMR load would be entirely different and untold other differences. I will check ringing and resonance as well though. Thanks for the input Dennis John Coleman, WA5BXO -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of Dennis Gilliam Sent: Thursday, May 14, 2009 5:48 PM To: Discussion of AM Radio in the Amateur Service Subject: Re: [AMRadio] push pull output XFMRs and neg feedback It sounds like you may have a shorted turn in one of them, NOS notwithstanding. It has happened to me, and it forms a tuned circuit resulting in a phase shift as it is an LC network now. 73 de W7TFO __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[AMRadio] Linear Operation for AM
As Don K4KYV and others have said before, linear amplifier's most linear operation, for AM, generally occurs when the drive carrier level is set to about 20 to 25 percent of the peak capability of the linear amplifier. Unfortunately this is also where the worst efficiency occurs. Therefore there is a lot of tube heat dissipation that occurs. This is all OK if the amp is big enough but it can cause replacement of tubes to be necessary more often than most of us would prefer. John WA5BXO __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] HF homebrew 100 plus watt vacuum tube Transmitter
The decision about what tubes to use is always a topic of a lot of conversation. For lower than 1000 Volt plate supplies, the multiple 6146s (I would use 3 in the RF and 4 in the modulator) is probably the best choice. Because of smaller tuning components in the tanks. Higher voltages means more spacing on everything. For higher voltages and fewer tubes the 812, 811, 805 and some others mention would be good. My favorite would be the push pull 812 class C final modulated by class B 811As running 1500 Volts or so. John WA5BXO -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of Ralph G. Rogers Sent: Sunday, May 10, 2009 5:41 PM To: amradio@mailman.qth.net Subject: [AMRadio] HF homebrew 100 plus watt vacuum tube Transmitter Hi Folks, I am planning on building an Amateur band HF homebrew 100 plus watt vacuum tube Transmitter. What I need is advice, information and ideas. I seek to find out what reasonable priced currently being manufactured 100 plus watt transmitter tubes are available and from what source. I wish to design around the tube so I can expect to find replacements when needed. Respectfully Yours, Ralph G. Rogers, K5RGR, DCR140T, TxCAP-3866 __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Filament choke
This may be an unwarranted alarm but if it were me, I would increase the value of the RFC in the bias line from 100uh to maybe 1mh. Your resonate frequency with the .02 bypass capacitor is quite low but I suspect a substantial amount of RF current will still be passing through a 100 uh coil and there may be heating especially if the choke is a tightly wound thing on .25 in form. Good Luck John, WA5BXO -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of sbjohns...@aol.com Sent: Thursday, April 30, 2009 8:37 AM To: glowb...@piobaire.mines.uidaho.edu Cc: amradio@mailman.qth.net Subject: Re: [AMRadio] Filament choke Here's my schematic so far for the 160m amp: http://www.wd8das.net/160m-GI7B.JPG This one won't be a as pretty as some... I'm going to build it on a steel chassis that has been used by others for at least four other projects and is literally swiss-cheesed with useful holes. (more holes than steel maybe) The front panel is 1/8 aluminum sheet also somewhat holey, but smoothed and now painted nicely with textured gray. The cabinet looks like it came from a later-vintage Meissner Signal Shifter with liftable lid and plenty of ventilation holes. Steve WD8DAS sbjohns...@aol.com http://www.wd8das.net/ - Radio is your best entertainment value. - __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[AMRadio] Seeking advice on wires in trees
I am going to need to have some tree work done before long.? At the present time, my antennas are held up in lower limbs by cords I have gotten over limbs by various methods.? I keep looking up higher at the tall pines and wondering if I could employ a tree climber to mount some kind of permanent support such as a pulley near the top. Would like to receive suggestions from folks that have done this and achieved relative permanence for antenna supports.? Thanks for your consideration. 73 de John, K5SEE When CW is no longer required, it will be a necessity. de K5SEE __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Google
It's Samuel Morse's birthday John, WA5BXO -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of zilas...@la.twcbc.com Sent: Monday, April 27, 2009 10:46 AM To: Discussion of AM Radio in the Amateur Service; mkh...@kias.org; Discussion of AM Radio in the Amateur Service Subject: [AMRadio] Google For you old timers (like me) who know the morse code, check out Google's main page today, www.google.com. __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] How to reply to someone else's post
Hi Brian... Just saying hello... -73- John WB5CW -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of WA5AM Sent: Thursday, April 23, 2009 1:55 PM To: Discussion of AM Radio in the Amateur Service Subject: Re: [AMRadio] How to reply to someone else's post On Thu, Apr 23, 2009 at 3:48 PM, D. Chester k4...@charter.net wrote: Users of this reflector need to review the proper etiquette for responding to other people's messages. Amen Don. This has been gone over time and time again, and the point just never seems to hit home with some. Thanks, Brian / wa5am __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[AMRadio] Frequencies in jeapordy?
I agree. Just get on and talk to as many as will respond. Our frequencies are still in jepordy. Allen KA1KIX Which frequencies are in jeapordy and how? I wasn't aware of this! John KX5JT -- It's News. It's Reviews. It's Interviews. It's Free. What Are You Waiting For? www.movieline.com __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[AMRadio] Wanted: IF Module for Collins R390 receiver
I am looking for an IF Module for a Collins R390 receiver. If you have one, and will dispose of it, please contact me via email. Thanks and 73, John, K5PGW __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] old BC AM FM or TV rigs
Jim: There might have been a lot of cool parts in that FM station. For instance, I was given and old GE 10KW TV XMTR back about 30 years ago. It had a lot of stuff I did not want, but others did, and it had a whole lot of stuff that was way cool that I wanted. It had 270 degree 1ma meter movement and large precision wire wound meter multiplying resistors. It had several large plate XFMRS and chokes. It had oil capacitors. Two of the chokes were 12 Hy open frame construction which Don, K4KYV, disassemble and rebuilt into a single 40Hy modulation reactor which I am very proud to have and I use still today. There were mercury vapor rectifiers and filament XFMRS. All of these things an more (I can't name all) were used in the construction of my PP-304tL rig. And parts that I did not want went all over the South, Of course you must have an empty garage to do all this in and that is where most folks say no, as they might to building their own vehicle from scrap. I f I had it to do now I would have to say no because there is just no time or space in my life right now. Hopefully that will change before I get to old to walk. Anyway I hope someone got the old FM rig and used the parts. John, WA5BXO -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of Jim WB5OXQ inb Waco, TX Sent: Saturday, April 04, 2009 11:32 AM To: Discussion of AM Radio in the Amateur Service Subject: [AMRadio] 7160Kc - The Video I would love to participate in this but I have no vintage equipment right now. Except for my linear amplifier I am running Kenwood which with the heil mike and good dsp audio settings I am told I have excellent audio. My amplifier is American made TenTec Titan 425 and easily makes legal limit on am with about 10 watts of drive giving my transciever a lot of headroom. I do have a camcorder and a digital camera that can shoot video and a video capture card in my pc. I watched the video and was impressed but like most I am not fortunate to have a broadcast transmitter. I was offered one a couple of years ago from a station that went dark but it was FM so I knew I could not use it for ham. Jim WB5OXQ __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] old BC AM FM or TV rigs
Yep it was 1KW DC input to the RF final amp. That is plate V times plate current. And 100% modulation was not counted as input power. Many folks believed, including myself, that 100% modulation meant not pinching the carrier off on the scope. So we all let the positive peaks go to where they may. As a result the carrier output could be around 880 Watts of carrier and PEP could go very high. I could hit 7KW PEP output without pinching the carrier. But with the new rules 1500 Watts PEP output is the limit. The mythical 375 watt carrier limit is only true for a single sine wave modulating the carrier to 100%. A carrier 100% modulated by a single sine wave will result in a PEP of 4 time the carrier. If the carrier is 375 watts then the that would be 1500 watts. In my case the carrier limit is even less because of the lopsided characteristics of my voice. That is assuming that I send the lopsided peak positive. But if I send them negative then I can run 600-700 watts of carrier output and still stay under the 1500 watt PEP limit. The funny thing about all this is, that the audio power is the same in either case, only the polarity of the audio is different when the microphone wires are reversed. But I can turn the carrier level up by increasing the plate voltage on the class C final only. (separate power supply for the modulator). I do this until the downward going peaks on the scope no longer pinch the carrier. Afterwards, the PEP is still the same but the carrier level is much higher. As to whether this is good or bad depends on the listener and the type of detector being used. Some say no difference, some say not as loud as before or doesn't sound 100% modulated. Others say the extra carrier level helps stomp back the QRN. All I know is audio power is the same and the power in the sidebands is the same in either case. I wrote a very detailed article about all of this several years ago but can't find it right now. John, WA5BXO -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of Jim WB5OXQ inb Waco, TX Sent: Saturday, April 04, 2009 12:18 PM To: Discussion of AM Radio in the Amateur Service Subject: Re: [AMRadio] old BC AM FM or TV rigs This was a fairly recent Continental 5KW transmitter, all solid state except for the single ceramic PA tube maybe a 4cx5000. I figured little value for ham so it was sold to another small station. It would be very difficult to get a bc rig into my shack but there could be room in the garage for one. This weekend I have to lower the crankup and repair my 40 meter dipole that fell in recent high winds. I listen most evenings on 7160 but often hear little AM. I am told when I am on I am very loud in some parts of the country. I understand that 375 watts of carrier is all that is allowed on AM. I used to think it was 1KW back in the 50s when I used to visit my ham neighbor. - Original Message - From: John Coleman j...@pctechref.com To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Saturday, April 04, 2009 12:02 PM Subject: Re: [AMRadio] old BC AM FM or TV rigs Jim: There might have been a lot of cool parts in that FM station. For instance, I was given and old GE 10KW TV XMTR back about 30 years ago. It had a lot of stuff I did not want, but others did, and it had a whole lot of stuff that was way cool that I wanted. It had 270 degree 1ma meter movement and large precision wire wound meter multiplying resistors. It had several large plate XFMRS and chokes. It had oil capacitors. Two of the chokes were 12 Hy open frame construction which Don, K4KYV, disassemble and rebuilt into a single 40Hy modulation reactor which I am very proud to have and I use still today. There were mercury vapor rectifiers and filament XFMRS. All of these things an more (I can't name all) were used in the construction of my PP-304tL rig. And parts that I did not want went all over the South, Of course you must have an empty garage to do all this in and that is where most folks say no, as they might to building their own vehicle from scrap. I f I had it to do now I would have to say no because there is just no time or space in my life right now. Hopefully that will change before I get to old to walk. Anyway I hope someone got the old FM rig and used the parts. John, WA5BXO Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] old rules
I found the article Jim I found the Article - turns out I never put a link to it on the web page http://www.qsl.net/wa5bxo/asyam/aam3.html John Coleman __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Lots of AM on 7160 Right Now!
Mike... That's good to hear and I wish my radio had been on... I'm in Eastern Oregon and my son is at Millsaps graduating on May 9... I've got to get him into our wonderful hobby... To join his 3 uncles. -73- John WB5CW -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of Mike Duke, K5XU Sent: Monday, March 30, 2009 5:57 PM To: Discussion of AM Radio Subject: [AMRadio] Lots of AM on 7160 Right Now! There is a large group of AM stations on 7160 right now. The calls I have heard thus far from my Jackson, Mississippi qth are: K0EOO, WA3HUZ, WF2U, K4DEE, and WA3VJB. There are at least 2 other stations that I can't hear. It's almost like listening on 10 meters, as there is no SSB qrm at the moment, just some static. Mike Duke, K5XU American Council of Blind Radio Amateurs __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Tube Theremin
Steve, The Thereman documents are also on one of the RCA Redbooks, (forget which one) but it's all there. Also check out Philip Neidlinger's web page. He built one. Lot's of photo and good information + schematics here. http://www.neidlinger.us/keppinger.htm I went to a Theremin concert a couple of years ago. They player had a modern one by Moog (about 1500 bucks). I ended up buying the Moog $400 version and have had some fun with it. I assure you though, that nothing that sounds like music has ever come from it, but it sure is fun to put it on the floor and watch the cat walk by. :-) I also take it to the middle school where I work and put it in my computer lab and watch the kids walk by. After we all have a good laugh, I show them a short video and then let them try. It's not as easy as it looks, or as RCA promised everyone when they tried to sell it. 73, John Dilks, K2TQN --- At 11:02 PM 3/26/2009, you wrote: Ken, that sounds great. We could also post it online for others. Thanks... Steve WD8DAS sbjohns...@aol.com http://www.wd8das.net/ - Radio is your best entertainment value. - -Original Message- From: Ken Zuercher hepcatrevi...@yahoo.com To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Thu, 26 Mar 2009 8:36 pm Subject: Re: [AMRadio] Tube Theremin Steve, I have a manual for what I believe is the first commercially available Theremin made by RCA in the 1930's. It uses the same hetrodyning principal but uses some oddball transformers that would give us fits to replicate. I can try to scan the manual with schematic if you're interested. It is fascinating. Ken Zuercher KC8QO --- On Fri, 3/20/09, sbjohns...@aol.com sbjohns...@aol.com wrote: From: sbjohns...@aol.com sbjohns...@aol.com Subject: [AMRadio] Tube Theremin To: amradio@mailman.qth.net Date: Friday, March 20, 2009, 4:08 PM I've got a new sort-of AM project on the bench here now:? a tube Theremin.? This musical instrument produces sound by heterodyning two oscillators that run in the low-end of the broadcast band. I'd like to find three Miller 70-OSC coils or equivalent for this rig - anyone have some?? If you are interested in the circuit, I'm building upon the ideas of Doug Forbes that I found online.? See http://www.wd8das.net/theremin.gif and http://www.wd8das.net/theremin.txt Thanks... Steve WD8DAS sbjohns...@aol.com http://www.wd8das.net/ - Radio is your best entertainment value. - __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe
[AMRadio] Gates BC-1H1 Rescue/Restore Update
Excellent work, Mike. That 1H1 looks cherry now. Wow. Mine is shameful in comparison. Nice job on the 833 tube bar. I found a less warped one from a 1G parts box online for mine. All of them warped in the Gates rigs. Wierd. I wondered what became of WROV. Sometimes I listened to them at Virginia Tech during the late 1970s, to Bart and the other DJs, when I wasn't working on WJJJ, WVVV, WUVT, WKEX in nearby Blacksburg and Christiansburg. 73 John K5PRO Message: 1 Date: Sun, 22 Mar 2009 14:31:54 -0400 From: M. K. Hess mkh...@kias.org Subject: [AMRadio] Gates BC-1H1 Rescue/Restore Update! To: amradio@mailman.qth.net Hello All! Here's where I'm at this Sunday with the Gates BC-1H1 AM Broadcast Transmitter Restoration for 160m AM! ... http://www.d1033982.mydomainwebhost.com/old-mike/Mike/n3eaq_files/BC-1H.htm Enjoy, I'm getting real close to final assembly and test Mike - N3EAQ __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[AMRadio] Meter for Morrow MB 560 or MB 560A
Anyone have a junker Morrow MB 560 or 560A for parts or a plate meter for a MB 560 transmitter? I need a meter for my transmitter. Please contact me if you have a meter for the Morrow MB 560 or MB 560A. Thanks and 73, John, K5PGW __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] another thought
We have been encouraging AM activity on 7.160 for several months. When CW is no longer required, it will be a necessity. de K5SEE -Original Message- From: VJB wa3...@yahoo.com To: amradio@mailman.qth.net Sent: Fri, 13 Mar 2009 9:05 am Subject: Re: [AMRadio] another thought Charlie W4MEC that's an interesting thought, but we will probably run up against the amount of time available to get on and try to keep up a wall of carriers. Sure, my converted broadcast transmitter will run 24/7 on whatever 40m frequency you want, but I may have to resort to recorded programming, like the Best of 75m AM alternating with the Best of 10m AM another time. I just found a 90 minute tape full of the propagation benefits of Solar Cycle 23, with VK2BA and myself in one outstanding QSO, with a sprinkling of others. Wow. Anyway, I'm game, say where. Paul/VJB __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[AMRadio] gas tube protection of front end
Ne2 or Ne51 or whatever you have in it, are good for protecting hollow state front ends. As they ionize between 50 and 90 volts, they will conduct static buildup before it builds enough to open a coil in the front end. Although i have never heard of that happening either. Commercial receivers sometimes use more expensive devices like Claire makes, with a narrow specification for breakdown voltage. The capacitance of a neon bulb, before it ionizes, is low. For solid state RX, however, neons might not have low enough breakdown to protect fets, varactors, etc. You cannot simply put an MOV or transorb across a HF circuit as it will have a lot of capacitance. Sometimes back to back diodes are applied. Spark gaps and gas tubes still rule. John K5PRO Message: 1 Date: Mon, 2 Mar 2009 00:57:58 + (UTC) From: w...@comcast.net Subject: [AMRadio] Receiver Antenna Input Question To: boatanch...@mailman.qth.net, amradio@mailman.qth.net, natio...@mailman.qth.net Message-ID: 1524953191.2309561235955478082.javamail.r...@sz0147a.emeryville.ca.mail.comcast.net Content-Type: text/plain; charset=utf-8 Would appreciate some advice here. I have a National NC-303 receiver that I'm restoring. I had a 75A-2 once that had a neon lamp (NE-2 ???) across the antenna input connection to supposedly act as a surge supressor for lightning, strong static charges?and strong rf energy from nearby transmitters. Is this a good idea? Does this really work? Is there a better device than a neon bulb? Appreciate any opinions, etc. 73, Bill, w0ng __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Getting started
Man... Beautiful shack... I love this website! -73- John WB5CW -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of Nick England Sent: Monday, February 23, 2009 4:55 PM To: amradio@mailman.qth.net Subject: Re: [AMRadio] Getting started How about a National NC-300 or 303? - great vintage looks, excellent tuning feel, very good performance on AM, CW, and SSB. Or a Hallicrafters SX-101? also very handsome and a good performer Or if you want something that isn't 19 wide and 75 lbs, but is about the same width as the Ranger, a Drake 2B. OK, that didn't make your choices easier, did it? But I think these three are much better rcvrs than your list below. I like the HQ-170 for SSB but never enjoyed it for AM. I couldn't make up my mind either - here's what I ended up with for my main vintage operating position - http://www.virhistory.com/ham/photos/shack3.jpg cheers, Nick K4NYW - Original Message - From: kc0...@cox.net To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Monday, February 23, 2009 6:01 PM Subject: Re: [AMRadio] Getting started Okay maybe I should have been a little more specific up to 300/350 dollars for a receiver that would be my range I guess. I have looked at a few Hammurlunds and Hallicrafters that look interesting like the HQ 110,150,170 and I bought a SX-99 real cheap from a local Ham I hope to check it out soon. 73,Bob __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] 75A2
Good point... Man, I surely appreciate all the help on this site... You guys are great! I'm just a beginner with the older stuff and have always been so envious of my older brother, WA5ZTE and my Dad W5SNY (silent)... They started in the old days and built and repaired their radios... I wasn't a ham until the 90's... And so I'm wanting to go back and learn from the good stuff... John WB5CW -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of Todd, KA1KAQ Sent: Friday, February 20, 2009 6:18 AM To: Discussion of AM Radio in the Amateur Service Subject: Re: [AMRadio] 75A2 It's certainly not a bad idea to have replacements if you do end up needing them (you will, someday), just not advisable to swap them wholesale as others have said. The radio itself is still the best tube tester IMO, once you get it running it's easier to compare results through performance. Tube testers are fine for a quick look and for showing some obvious faults, but I've had two instances in the last 2 years where tubes tested great and showed no problems, but didn't work properly in the set. I've also had receivers that worked great despite having some tubes that tested low on the scale. ~ Todd, KA1KAQ/4 On Thu, Feb 19, 2009 at 11:24 PM, John Carrington, M.D. jm...@charterinternet.com wrote: I don't, Bob, but I'm not going to rush into buying the replacements until I can get them tested.. Good advice and thanks! __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
