Re: [AMRadio] Tubing
I would stay with copper, plated with tin or silver (you can get silver-dip to plate copper, though it is expensive). Steel, particularly stainless steel is a poor RF conductor. You'd be better off with aluminum. Are you trying to make coaxial cable or just use large conductors between terminals? I'd have to look at the transmitter here to see if there was any rigid coaxial cable in the set. Did you ever find the .001 capacitor? 73 de Bill, AB6MT [EMAIL PROTECTED] - Original Message - From: "WE0H" <[EMAIL PROTECTED]> To: "Discussion of AM Radio in the Amateur Service" Sent: Monday, July 09, 2007 9:10 PM Subject: Re: [AMRadio] Tubing > Steel automotive fuel line. > > Mike > WE0H > > Rick Brashear wrote: > > Thanks Bill, good idea. > > > > Jim... I need to make connections to and from the antenna and capacitor in a > > GE BT-20-A broadcast transmitter. I could use heavy wire since it is only > > 250 watts and not in continuous service as it was when used commercially, > > but I'd like to keep it as original looking as possible and I think the > > tubing looks kind of cool. > > > > Bob... I may do just that (use copper tubing). My only reason for using the > > steel or steel appearing tubing is it will match that which is already in > > the transmitter. > > > > Thanks to all for the help and ideas. Keep'em coming! > > > > 73, > > Rick/K5IAR > __ > AMRadio mailing list > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > To unsubscribe, send an email to [EMAIL PROTECTED] with > the word unsubscribe in the message body. __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Tubing
Automobile air conditioning line? Or perhaps tubing from a refrigerator? Bill - Original Message - From: "Rick Brashear" <[EMAIL PROTECTED]> To: "'Discussion of AM Radio in the Amateur Service'" Sent: Monday, July 09, 2007 6:51 PM Subject: [AMRadio] Tubing I need to make a couple of RF connections using 1/4" O.D. tubing. The stuff that is already in the transmitter appears to be soft steel of some kind. It's not aluminum and could possibly be coated copper. Any ideas of what this is? I checked McMaster-Carr and they have some annealed steel aircraft tubing that appears to be similar, but I'm not sure. I only need a couple of feet, so I hate to buy $30.00 to get it. Thanks for any help or advice... Rick/K5IAR __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body. __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Meter Revisited
Rick, did you get my direct email to you? Bill - Original Message - From: "Rick Brashear" <[EMAIL PROTECTED]> To: "'Discussion of AM Radio in the Amateur Service'" Sent: Monday, July 02, 2007 7:13 AM Subject: RE: [AMRadio] Meter Revisited > Thanks Todd. It is similar to the 610, but has a smaller window. > Rick > > > Looks like the ones used in the Beastly 610 Rick? I sent one of those > off with mine when I sold it earlier this year, to replace a round one > that had been subbed. > > I have boxes of meters and probably have more of them, time and... > 73, Todd KA1KAQ > > __ > AMRadio mailing list > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > To unsubscribe, send an email to [EMAIL PROTECTED] with > the word unsubscribe in the message body. __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Meter Revisited
I'll send it if it exactly matches your picture, but I am running IE7 and I didn't see any picture either, even after digging into the website you specified. Bill - Original Message - From: "Rick Brashear" <[EMAIL PROTECTED]> To: "'Discussion of AM Radio in the Amateur Service'" Sent: Saturday, June 30, 2007 12:19 PM Subject: RE: [AMRadio] Meter Revisited > Great Bill. The picture didn't make it, could you send it to my email > address: [EMAIL PROTECTED] > > Thanks, > Rick > > > Hi Rick, > > I have this one, you can see it below. If you like it you can have it. > > Bill > > __ > AMRadio mailing list > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > To unsubscribe, send an email to [EMAIL PROTECTED] with > the word unsubscribe in the message body. __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Meter Revisited
Hi Rick, I have this one, you can see it below. If you like it you can have it. Bill - Original Message - From: "Rick Brashear" <[EMAIL PROTECTED]> To: "'Discussion of AM Radio in the Amateur Service'" Sent: Saturday, June 30, 2007 11:27 AM Subject: [AMRadio] Meter Revisited > You can see a picture of a meter similar the AC meter I am looking for at > the link below. This is the exact style case I need. > > Click on AC Meter once at the site. > > http://w5ami.net/hitch/index.php?board=5.0 > > Thanks, > Rick/K5IAR > > __ > AMRadio mailing list > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > To unsubscribe, send an email to [EMAIL PROTECTED] with > the word unsubscribe in the message body. __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Dial reproductions
Do you have a picture of what the escutcheon (and/or the transmitter) look like? Bill - Original Message - From: "David Knepper" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Cc: Sent: Friday, June 22, 2007 4:39 AM Subject: [AMRadio] Dial reproductions > I am builidng a reproduction of an early Collins transmitter (30W) and would > like to know if anyone has a source or background information on how to make > those large metal face plates that have a scale of 0-100? > > The three inch knobs are being made for me but I would like to buy those > metal disks to mount the knobs on. I hope that I am making myself somewhat > perfectly clear. > > Also, I will buy any Weston 301 meters, prefer 0 - 50 ma, 0 - 100 ma, and > 0 - 25 ma scale. I still need those surface mounted meter cases, 3 inch > round. > > > Thank you > > David Knepper, W3ST/W3CRA > Secretary to the Collins Radio Association > www.collinsra.com > Publisher of the Collins Journal > Join the CRA - the world's largest Collins group > > __ > AMRadio mailing list > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > To unsubscribe, send an email to [EMAIL PROTECTED] with > the word unsubscribe in the message body. __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Lacing Cord
Try this supplier: http://www.sourcetelsupply.com/catalog/index.php?cPath=27 - Original Message - From: "Rick Brashear" <[EMAIL PROTECTED]> To: "'Discussion of AM Radio in the Amateur Service'" Sent: Sunday, May 27, 2007 9:33 AM Subject: [AMRadio] Lacing Cord > I bought a spool of waxed lacing cord from someone on this list some time > back. I would like to find another similar spool. The one I have is about > the size of kite string and is brown in color. Anyone have such an item > they would like to sell? > > Thanks, > Rick/K5IZ > > __ > AMRadio mailing list > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Partner Website: http://www.amfone.net > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > To unsubscribe, send an email to [EMAIL PROTECTED] with > the word unsubscribe in the message body. __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] #4 wire from mains? - they gotta be kidding
Don't be afraid to use large wire in primary feeds. I have seen the result of "skimping" with the result conduit noticeably warms after about 10 - 15 minutes of operation. The worst consequence is a power sag when the transmitter comes on with the result that in the extreme, contactors won't operate correctly. The wire tables specify the minimum wire size, especially if long runs are contemplated (fifty feet or so). You will never regret using the next size, even if it is initially more expensive. The current price of copper does not make the decision any easier. Bill - Original Message - From: "Bill Fondren" <[EMAIL PROTECTED]> To: "Discussion of AM Radio in the Amateur Service" Sent: Wednesday, May 09, 2007 8:43 PM Subject: Re: [AMRadio] #4 wire from mains? - they gotta be kidding > Brian I think u answered a lot ur questions or concerns. The transmitter was designed for 24 hour / 7 day a week operation. at 1000 watts. I agree # 4 seems overkill but Gates wanted to get as stiff a power supply to the transmitter as possible. Those transmitters were used in a lot of small towns, mom and pop operations. The old branch circuit tables showed 30 amp #10, 40 amp #8, 50 amp # 6 etc. Then down at the bottom of the page the small print said for long distance runs keep the voltage drop less than 3% by increasing wire size. Anyway from the distances u mentioned dont think u will have a problem. Dont forget to double the distance in making voltage drop calulations because the current comes in on one wire and returns on the other wire. Bill Fondren K5PML > > > "A.R.S. - W5AMI" <[EMAIL PROTECTED]> wrote: > I've been reading the Gates BC-1T manual and found two instances where > they state that #4 wire should be used. One says: > > "3) ...provide #4 or larger primary wiring from entrance box to transmitter". > > What the heck am I missing here? My 200 amp mains (as the wire runs) > to my shack junction box will be about 24 feet max, and then from the > shack panel to the Gates will be no more than 12 feet. > - - - > Brian / wa5am > > -- > Suburbia is where the developer bulldozes out the trees, then names > the streets after them. - Bill Vaughan > __ > AMRadio mailing list > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Partner Website: http://www.amfone.net > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > To unsubscribe, send an email to [EMAIL PROTECTED] with > the word unsubscribe in the message body. > > > __ > AMRadio mailing list > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Partner Website: http://www.amfone.net > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > To unsubscribe, send an email to [EMAIL PROTECTED] with > the word unsubscribe in the message body. __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] League pulls RM-11306
Pete, I think you only have to listen to the on-air comments made by the diehard SSB operators and AM'ers to determine the motivation behind "stations that are clustered around an imaginary window." >From the AM viewpoint (this is the amradio list, isn't it?) considerable effort has been made by AM operators to obtain crystals, tune equipment and construct antennas which operate in the AM window. The frequencies are published nationally and weekly nets are scheduled and published nationally with Collins net control operators coordinated from coast to coast. The AMI net just last Wednesday attracted greater than 60 stations who checked in to the West Coast AMI net on 3870 at 8:00pm local time. A significant number were from mountain and central time zones. 73 de Bill, AB6MT [EMAIL PROTECTED] - Original Message - From: "Peter Markavage" <[EMAIL PROTECTED]> To: Sent: Sunday, April 29, 2007 5:22 PM Subject: Re: [AMRadio] League pulls RM-11306 > Actually Mike, what I really see on 75 M is the overall lack of amateurs > to be flexible now that we have a lot more phone area. Old habits are > hard to break; AM'ers still try to cluster around an imaginary window; > diehard SSB operators are also still clustered around this imaginary > window, and both groups seen reluctant to want to break ground anywhere > else, yet lower in the band are frequency areas totally void of any > signals for a good part of the evenings. Of course, a number of us have > made the move lower and, at times, with great success and a lot less > adjacent hostile aggravation. > > Our subbands are part of the FCC's rewards program. You pass the test, > you get more privileges. Personally, how other country's government > agencies structure their amateur radio frequency privileges, license > classes, max. power, etc. is of little concern to me. There is no reason > to be "in step" with them on this issue. > > Pete, wa2cwa > > > On Sun, 29 Apr 2007 18:50:55 -0400 "Mike Sawyer" <[EMAIL PROTECTED]> > writes: > > Where have you been living Pete, in a cave?? Look at the mess on 75M. > Don's suggestion can't make it any worse than what it is now. Besides, > we could be in step with our neighbors to the > north. > > Mod-U-Lator, > > Mike(y) > > W3SLK > __ > AMRadio mailing list > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Partner Website: http://www.amfone.net > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > To unsubscribe, send an email to [EMAIL PROTECTED] with > the word unsubscribe in the message body. __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] League pulls RM-11306
- Original Message - From: "Geoff/W5OMR" <[EMAIL PROTECTED]> > Are you sure -you- know how much PEP your rig is running, without > distorting/flat-topping the peaks? > > 73, etc > -Geoff/W5OMR Hi Geoff, Been there, tried that.. have run increased carrier, and with an asymmetrical limiter have limited positive peaks to comply with the 1500 W PEP limit. Unfortunately, I couldn't convince listeners to adjust their detectors to receive asymmetrical modulation and they complained of distortion. Also, think somewhere buried in the FCC rules is something about operating in accordance to good engineering practices. Good engineering practice suggests low distortion, fully modulated audio. I am sure that if the FCC were to allow a 1000 watt AM transmission, there would be no problem meeting the technical requirements of fully modulating a 1000 watt carrier. 73 de Bill, AB6MT [EMAIL PROTECTED] __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] League pulls RM-11306
- Original Message - From: "Bry Carling" <[EMAIL PROTECTED]> To: "Discussion of AM Radio in the Amateur Service" > > But that is already the de facto situation - where 3870 to 3890 kHz > is concerned. > Having some ARRL endorsement will not mean anything. > They do not represent the majority of radio amateurs, and > such a recommendation has probably already been noted by > ARRL at some point. > The ARRL has recognized 3870 as the West Coast AM calling frequency. The ARRL endorsement can be the basis for agreement. Isn't that what we are all here for anyway? 73 de Bill, AB6MT [EMAIL PROTECTED] __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] League pulls RM-11306
- Original Message - From: "Peter Markavage" <[EMAIL PROTECTED]> > Jim: > What justification would you or someone present to the FCC raise the > power level back to 1000 watts as it was a number of years ago? > > And Bill said: a petition for an AM Window from 3870 to 3885. > I view the AM Window (if you want to call it that) from 3600 to 4000 KHz. > I see no rational to live and operate in a 15 KHz box. > There is plenty of reason to allow AM operation at 1000 watts carrier output. Carrier serves to strongly reduce or eliminate background noise and provide a comfortable communications environment. AM was severely short-changed by the 1500 watt PEP regulation. AM stations are now restricted to only 350 watts carrier. A correction re the quoted statement. There is no need to petition the FCC for an AM window, IHMO that would be counter-productive. The ARRL should consider recommending a 3870 to 3885 KHz AM window in it's 80 meter band plan. That doesn't mean that AM will not be heard outside the window, or that stations using other modes cannot operate inside the window. It would suggest that if a station were looking for an AM contact, that one might likely be found inside the window. It would also serve to reduce the conflict between AM and SSB by identifying an band area where AM operation is anticipated and encouraged. 15KHz, even 25 KHz considering sidebands, isn't a big slice of the 80 meter band. 73 de Bill, AB6MT [EMAIL PROTECTED] __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] ARRL in today's world
- Original Message - From: "J.D. Mac Aulay, WQ8U" <[EMAIL PROTECTED]> > Mike (W3SLK), > . We need to tell the ARRL directly what we want now - and also what we want for the future. Like training some animals, a smart rap on the nose can be very effective. > >We need to recognize that they do represent all of us to the international community (like it or not). The IARU recognizes the ARRL as representing the interests of amateur radio in the USA. The IARU is the voice of all hams in the international defense of our frequencies. This is where the battle for frequencies happens - lose here and we are off the air. > > The ARRL does a lot of good in support of ARES, education, fighting BPL, advocating ham antenna rights, etc. It is not an all bad organization. > > Through our feedback to our directors and through the ballot we can clearly tell them our feelings. Dropping out is not the way to make changes. > > With respect and 73 > Mac > WQ8U > Hillsborough, NC We need the ARRL to recognize the AM Window from 3870 to 3885 and we need to petition the FCC to allow AM to use a power level of 1000 Watts carrier. 73 de Bill, AB6MT [EMAIL PROTECTED] __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] My Amplifer Quest took a strange turn today
- Original Message - From: "Bow" <[EMAIL PROTECTED]> To: "'Discussion of AM Radio in the Amateur Service'" Sent: Saturday, April 21, 2007 3:06 AM Subject: RE: [AMRadio] My Amplifer Quest took a strange turn today Thanks Bill.. Any idea about the input impedance? For now, I will be running it with my Icom IC-718, so I need to figure out that interface! Bow W5EFR Have no idea what the input impedance might be. It has a SO-239 on the back as an input, so expect it will be somewhere around 50 ohms, but could be anything and will probably change with frequency. If you have a small antenna tuner, you might hook it up between the IC-718 and the input. Or, if not, hook up the IC-718 directly, but run it at low power (5 watts) and check the SWR. Frankly, I'd be surprised if it was a close match. You can set up a small coil and capacitor (L section) as input tuning without too much trouble if you wish. The amp will probably take much less than 100 watts to drive it to full output in normal operation. Don't overdrive the amp in AM. Recall that the carrier + sidebands take 4 x carrier PEP. If the amp is rated at 800 watts, don't run it at more than 200 continuous. You'll need a fan as the power transformer and tubes will heat up fairly quickly at that power level. I'd plan to run it at no more than 150 watts or so to keep things comfortable. Depending on the plate voltage, even that might be a little high. There is no reason to push the amplifier, you will be at an advantage over the 25 watts of the barefoot IC-718. To get a 3-db increase in a receiver, you need to double the power of the amplifier. +/- 50 watts won't make all that much difference if you are at the 150 watt level. Bill __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] My Amplifer Quest took a strange turn today
Forgot to mention, it is probably a grounded-grid design (don't see any input tuning). Underneath, there should be two long ferrite transformers connected between the filament transformer and the filaments of the 813's. If there are, the circuit is a grounded grid linear amplifier. You should be able to find circuits for the amp in the 1960's ARRL handbooks or the Editor and Engineer's handbooks. 73 de Bill, ab6mt [EMAIL PROTECTED] - Original Message - From: "Bow" <[EMAIL PROTECTED]> To: "Discussion of AM Radio in the Amateur Service" Sent: Saturday, April 21, 2007 2:18 AM Subject: [AMRadio] My Amplifer Quest took a strange turn today Yup, I headed to the local Radio store to have my Yeasu 2 meter rig looked at (no TX). I found it it is a dead-duck, probably the processor, it will make a nice paperweight... ANYWAY... I'm talking with the owner about the fact I was looking for an amp, prefer tubes, mainly for use on 75M and maybe 10M... Around 600-700 watts... He thinks a bit and then rotates to his right and points up on the top shelf... "It was left here for a repair about 1.5 years ago, I got it repaired, the guy never picked it up... It is set-up for 75M and 40M.. Pair of 813's... Everything checks good on it, it’s a nice amp.. You can get it off my damn shelf for $75..." I couldn't reach for my wallet fast enough... Now the fun part begins... Can anyone ID it, or maybe point to a handbook that is may have come out of so I can get a schematic?? Here It Is: http://riley-music.com/BowsStuff/AMP/02Front.JPG http://riley-music.com/BowsStuff/AMP/04%20RightSide.JPG http://riley-music.com/BowsStuff/AMP/05LeftSide.JPG http://riley-music.com/BowsStuff/AMP/06Rear.JPG http://riley-music.com/BowsStuff/AMP/07PowerTranny.JPG http://riley-music.com/BowsStuff/AMP/08CoilAndCaps.JPG http://riley-music.com/BowsStuff/AMP/09_813a.JPG http://riley-music.com/BowsStuff/AMP/10_813bChoke.JPG http://riley-music.com/BowsStuff/AMP/11Interior.JPG And Even though I have not fired it up yet, I did light off the filaments... I think EVERY piece of tube gear should have a window... http://riley-music.com/BowsStuff/AMP/12MagicInTheWindow.JPG http://riley-music.com/BowsStuff/AMP/13Glowin813s.JPG So, can anyone help me ID my score?!?!? Bow W5EFR -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.446 / Virus Database: 269.5.5/769 - Release Date: 4/19/2007 17:56 -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.446 / Virus Database: 269.5.5/769 - Release Date: 4/19/2007 17:56 __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body. __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: ***SPAM*** [AMRadio] My Amplifer Quest took a strange turn today
>From the coil, it appears to be a 80 meter amplifier, might be 40 meters... It is probably a linear unless the transformer in the back of the 813's is a mod trannie. It has a PI output stage, would guess the coax feed from the loading capacitor (the big one) goes to either a t/r relay underneath or to the output SO-239 coax fitting. The tuning capacitor is on the left, and the load capacitor is on the right. It seems to have an integral power supply, but rectifiers and caps are apparently underneath. It wouldn't hurt to bring it up with either a variac, or at least a 100 watt lightbulb in series with the 110VAC power supply, then energize the HV so that you don't shock the HV filter caps after all this time. Else you may have to replace them. A better way: If you have another power supply, even a transformer and a diode stack, it would be well to reform the filter caps by slowly charging the capacitors to their rated voltage. Keep the charge voltage low, with charge current under 5 ma and expect to increase applied voltage as you see charge current drop. The process can take a period of several hours. Who knows, it might work. Wouldn't hurt to apply a little soap and water. Don't trust any high-ohm power resistors such as found as bleeder resistors, they tend to open with age and moisture. Always ground the HV line with an insulated clip lead before you touch anything. Didn't hear anything on 3870 this evening either, but couldn't take the time to fire up the rig this evening. 73 de Bill, ab6mt [EMAIL PROTECTED] - Original Message - From: "Bow" <[EMAIL PROTECTED]> To: "'Discussion of AM Radio in the Amateur Service'" Sent: Saturday, April 21, 2007 2:39 AM Subject: RE: ***SPAM*** [AMRadio] My Amplifer Quest took a strange turn today Yup, I figure it's a homebrew... I was just wondering if anyone has seen something like it in one of the old handbooks! Bow W5EFR -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of George Sent: Friday, April 20, 2007 22:33 To: 'Discussion of AM Radio in the Amateur Service' Subject: RE: ***SPAM*** [AMRadio] My Amplifer Quest took a strange turn today Looks homemade to me. See the extra holes in the chassis and the transformer mounted skewed. George KA5DEN -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Bow Sent: Saturday, April 21, 2007 4:19 AM To: Discussion of AM Radio in the Amateur Service Subject: ***SPAM*** [AMRadio] My Amplifer Quest took a strange turn today Yup, I headed to the local Radio store to have my Yeasu 2 meter rig looked at (no TX). I found it it is a dead-duck, probably the processor, it will make a nice paperweight... ANYWAY... I'm talking with the owner about the fact I was looking for an amp, prefer tubes, mainly for use on 75M and maybe 10M... Around 600-700 watts... He thinks a bit and then rotates to his right and points up on the top shelf... "It was left here for a repair about 1.5 years ago, I got it repaired, the guy never picked it up... It is set-up for 75M and 40M.. Pair of 813's... Everything checks good on it, it’s a nice amp.. You can get it off my damn shelf for $75..." I couldn't reach for my wallet fast enough... Now the fun part begins... Can anyone ID it, or maybe point to a handbook that is may have come out of so I can get a schematic?? Here It Is: http://riley-music.com/BowsStuff/AMP/02Front.JPG http://riley-music.com/BowsStuff/AMP/04%20RightSide.JPG http://riley-music.com/BowsStuff/AMP/05LeftSide.JPG http://riley-music.com/BowsStuff/AMP/06Rear.JPG http://riley-music.com/BowsStuff/AMP/07PowerTranny.JPG http://riley-music.com/BowsStuff/AMP/08CoilAndCaps.JPG http://riley-music.com/BowsStuff/AMP/09_813a.JPG http://riley-music.com/BowsStuff/AMP/10_813bChoke.JPG http://riley-music.com/BowsStuff/AMP/11Interior.JPG And Even though I have not fired it up yet, I did light off the filaments... I think EVERY piece of tube gear should have a window... http://riley-music.com/BowsStuff/AMP/12MagicInTheWindow.JPG http://riley-music.com/BowsStuff/AMP/13Glowin813s.JPG So, can anyone help me ID my score?!?!? Bow W5EFR -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.446 / Virus Database: 269.5.5/769 - Release Date: 4/19/2007 17:56 -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.446 / Virus Database: 269.5.5/769 - Release Date: 4/19/2007 17:56 __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body. -- No virus found in this incoming message. Checked by AVG Free Edition. Ver
Re: [AMRadio] the post about amfone.net post last week...
You are absolutely correct, Pete, no one owns any frequency in Amateur Radio. I have operated SSB on 3870 and on a number of other frequencies also, and will likely do so in the future. I listen before transmitting and don't intend to interfere with other stations, and hope that other stations will operate with the same courtesy, understanding and respect of the privileges we have as Amateur Radio Operators. Unfortunately, there are those who will exploit and abuse those understandings, and in this case FCC rules. It benefits all if we can come up with our own understandings of where we can operate without disturbing other operations. We have limited bandspace and multiple modes of operation. If we cooperate, that bandspace can be used to the benefit of everyone. There are DX windows for example that are not mandated, but reserved for distance communications. Same with digital modes in and around CW operations. Hopefully we are mature enough so that it shouldn't be necessary to rely on an enforcement body to watch our every move, and that we can set up schedules and nets. This is an old saw and has digressed into bear-baiting in this case. It is time to work on our stations or get on the air and make contacts. :^) 73 de Bill, ab6mt [EMAIL PROTECTED] - Original Message - From: "Peter Markavage" <[EMAIL PROTECTED]> To: Sent: Wednesday, April 18, 2007 5:21 PM Subject: Re: [AMRadio] the post about amfone.net post last week... > As others have pointed out, I don't know of any widely published band > plans that identify an AM Window exclusively for AM operation on 75 > meters. 3885 has been a recognized AM calling frequency for many years. > However, here on the East Coast, I'm willing to bet you can probably find > as many AM'ers operating 3880, 3875, and 3870 as they do 3885. Even I > have worked SSB stations on 3870. No one owns a frequency and definitely > no one owns an imaginary window. It doesn't take rocket science to set up > either during QRM'less QSO's or through e-mail, or even via land lines or > a USPS Post Card, alternate frequencies to check for activities of > interested parties (i.e. nets, swap shops, current medical ills, etc.). > This type of constant discontent is probably why the majority of my 75 > meter AM activity is below 3870 KHz. I have no use for imaginary windows > since there is a heck of a lot of empty spectrum as you tune lower in the > band. And, contrary to popular belief, you can work coast to coast below > 3870 KHz. > > > Hi Pete, > > > > Thank you for the reference, there are others (which I have not been > > able to > > find). The list describes the AM window from 3870 to 3885. What is > > silly > > about two calling frequencies? There are a large number of AM > > operators on > > the band, on all coasts. 3885 is a popular East coast frequency and > > 3870 is > > popular on the West coast. There is also plenty of activity > > in-between, > > and when the band is open, it is a kick to operate coast-to-coast. > > :-) > > > > 73 de Bill, ab6mt > > [EMAIL PROTECTED] > > > > __ > > AMRadio mailing list > > List Rules (must read!): http://w5ami.net/amradiofaq.html > > List Home: http://mailman.qth.net/mailman/listinfo/amradio > > Partner Website: http://www.amfone.net > > Help: http://mailman.qth.net/mmfaq.html > > Post: mailto:AMRadio@mailman.qth.net > > To unsubscribe, send an email to [EMAIL PROTECTED] > > with > > the word unsubscribe in the message body. > > > > > __ > AMRadio mailing list > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Partner Website: http://www.amfone.net > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > To unsubscribe, send an email to [EMAIL PROTECTED] with > the word unsubscribe in the message body. __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] the post about amfone.net post last week...
- Original Message - From: "Peter Markavage" <[EMAIL PROTECTED]> > I can only find it here on the ARRL AM web page but it's not listed as a > "calling frequency". Having two designated AM calling frequencies 15 KHz > apart is silly. > See: > http://www.remote.arrl.org/tis/info/am-freqs.html > > Pete, wa2cwa Hi Pete, Thank you for the reference, there are others (which I have not been able to find). The list describes the AM window from 3870 to 3885. What is silly about two calling frequencies? There are a large number of AM operators on the band, on all coasts. 3885 is a popular East coast frequency and 3870 is popular on the West coast. There is also plenty of activity in-between, and when the band is open, it is a kick to operate coast-to-coast. :-) 73 de Bill, ab6mt [EMAIL PROTECTED] __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] the post about amfone.net post last week...
- Original Message - From: "ars.w5omr" <[EMAIL PROTECTED]> To: "Discussion of AM Radio in the Amateur Service" Sent: Wednesday, April 18, 2007 2:11 PM Subject: Re: [AMRadio] the post about amfone.net post last week... > Bill Smith wrote: > > Well stated, except for the AM window which does exist. > > No it does NOT Bill. > > > > Further the ARRL has announced 3870 as the West Coast Calling Frequency. I do notice that it > > is hard to find on the present web site. > > > > Would you be so kind as to present me with the URL? > > > Only one question. You seem to be very concerned about AM operation on > > 3970. > > There's AM Activity on 3.970? COOL! See? I -said- that anywhere > 'phone can be operated, so could AM. > > ;-) > > > Why haven't we ever heard you operate on 3870? > > > > I'm only on 3.870, if I'm mobile, and I'm on SSB. > > I don't operate -anywhere- on 75m after I get off from my daily stint of > 4am at 300w (if I'm up that early) to 6am, break for an hour, and back > on with 100w at 7am till 9am. After that, it's time to shut it down for > the day, because the neighbors -will- bitch. > > -- > 73 = Best Regards, > -Geoff/W5OMR There is a Military Collector's Net on 3.975, or used to be. You might look for it. You don't operate AM on 3870 at all! Then why are you complaining about AM operation on 3870? 3780 has been the recognized AMI West Coast frequency for many years. There is a very active net Wednesday evenings at 8:00pm Pacific Time. You are free to operate SSB on that frequency, but you will likely run into interference from any number of AM stations from the Northwest (Idaho, Oregon, Washington) and the West (Nevada, California, Arizona, New Mexico, Oklahoma) who have been operating on 3870 for years, and will likely continue to do so. By using a known frequency, AM operators minimize interference to other operators. I don't know what kind of arrogance it takes to attempt to move in and take over a frequency the way one or two stations with 5-calls have attempted on 3870, but it has been tried by them in the past on other frequencies, even SSB net frequencies. There is little point in further discussing the issue, but if you were the gentlemen you suggest others emulate, you would heed your own words and find another spot outside the window. 73 de Bill, ab6mt [EMAIL PROTECTED] __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] the post about amfone.net post last week...
Well stated, except for the AM window which does exist. Further the ARRL has announced 3870 as the West Coast Calling Frequency. I do notice that it is hard to find on the present web site. Only one question. You seem to be very concerned about AM operation on 3970. Why haven't we ever heard you operate on 3870? 73 de Bill, ab6mt [EMAIL PROTECTED] - Original Message - From: "ars.w5omr" <[EMAIL PROTECTED]> To: "Discussion of AM Radio in the Amateur Service" Sent: Wednesday, April 18, 2007 1:15 PM Subject: Re: [AMRadio] the post about amfone.net post last week... > A.R.S. - W5AMI wrote: > > Thanks Todd, you're a good guy and I know all of us around here think > > the same way. > > Todd? Todd Who? That Damn Yankee? > > ;-) > > just TEASIN'... ;-) Good natured ribbing is sometimes ok... sometimes > people get carried away with it. > > I agree with you guys... what's happening here is a 'generalization' > that everyone who bothers the West Coast AM'ers on 3.870 have gotta be > from the ArkLaTex area, and goodness gracious and God bless us, the only > purpose in our lives seems to be to bother the AM'ers on 3.870 on the > West Coast. > > What a load of crap. > > W1GFH and the rest of the Left Coasters also whine that 3.870 is the 'AM > Calling Frequency' of the west coast. 'Not so' as decreed by the ARRL. > The League specifically says that 3.885Mc is the AM Calling frequency of > 75m. There is not now, nor has there ever been an operating 'window' > where only AM is found. > > Bottom line; if the Frequency is in Use, don't USE it! Regardless of > Mode! You wouldn't find an AM operator cranking up within 3kHz of an > existing AM conversation, would you? So, why would the Left Coasters > move to 3.872Mc, and operate there, knowing there's a QSO on 3.870 SSB? > > That goes for both the SSB'ers on 3.870, and the West Coast AM'ers. If > the West Coast guys hear SSB on 3.870, then they should move. > > On the same hand, if the 3.870 guys in Ark/La/Tex hear someone on/around > 3.870, -they- should make arrangements to find a 'clearer' frequency. > NO ONE OWNS A FREQUENCY! We're educated, adult, licensed Ham Radio > operators that -know- how to be gentleman, aren't we? > > Why do some -insist- on not ACTING like it? > > -- > 73 = Best Regards, > -Geoff/W5OMR(/m5 New Orleans) > > > __ > AMRadio mailing list > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Partner Website: http://www.amfone.net > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > To unsubscribe, send an email to [EMAIL PROTECTED] with > the word unsubscribe in the message body. __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] SX-99 Mute
Put a t/r relay in the antenna, and switch the speaker. Remember to switch in a resistor load in place of the speaker. I think the SX-99 has 500 ohm and 8 ohm outputs, you might bridge a 680 ohm resistor across the receiver's high impedance terminals. You should be feeding the receiver's 300 ohm balanced antenna input with a balun. You will enjoy a noticeable reduction in noise and increase in spurious signal rejection. 73 de Bill, ab6mt [EMAIL PROTECTED] - Original Message - From: "Bob Peters" <[EMAIL PROTECTED]> To: "AM" ; "Boatanchors" <[EMAIL PROTECTED]> Sent: Monday, April 16, 2007 2:03 PM Subject: [AMRadio] SX-99 Mute Hay guys does the SX-99 have anyway to mute??? I do not see anything in the manual for a mute... Suggestions??? Very Best 73's Bob W1PE The Voice of Mesquite www.w1pe.com __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body. __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Eimac 15E
Hmm.. now it seems to be: http://www.cnjradio.net/tubedb/read.cgi?tube=15E Bill - Original Message - From: "Geoff/W5OMR" <[EMAIL PROTECTED]> To: "Discussion of AM Radio in the Amateur Service" Sent: Sunday, April 15, 2007 6:24 PM Subject: Re: [AMRadio] Eimac 15E > Bill Smith wrote: > > Try http://www.cnjradio.cn/radio.net/tubedb/read.cgi?tube=15E > > > > Ought to make a neat AM radio transmitter. :-) > > > > that link is broken... > > > Subject: [AMRadio] Eimac 15E > > > > > > Anyone know where I can get a complete spec sheet for the Eimac 15E? > > Didn't find a complete spec sheet on it, but did find this... > > Eimac JAN-CIM-15E > Pat Jankowiak writes : /The 15E put out a 5KW pulse at 600 MHz for use > in dive WWII bomber radar. > (see image at http://www.electricstuff.co.uk/00302001.JPG) > > note: Patrick used to be a regular contributor to the AM Reflector) > > -- > 73 = Best Regards, > -Geoff/W5OMR > > / > __ > AMRadio mailing list > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Partner Website: http://www.amfone.net > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > To unsubscribe, send an email to [EMAIL PROTECTED] with > the word unsubscribe in the message body. __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Eimac 15E
Try http://www.cnjradio.cn/radio.net/tubedb/read.cgi?tube=15E Ought to make a neat AM radio transmitter. :-) 73 de Bill, ab6mt [EMAIL PROTECTED] - Original Message - From: "Barrie Smith" <[EMAIL PROTECTED]> To: "Discussion of AM Radio" Sent: Sunday, April 15, 2007 4:42 PM Subject: [AMRadio] Eimac 15E Anyone know where I can get a complete spec sheet for the Eimac 15E? It's a physically small, glass triode, used (I'm told) as an output tube in aircraft radar. Evidently, a long time age. All connections are pins. Two out the bottom are filament, one out the top is the grid, and the plate comes out the side. Certainly a different configuration. I have some specs. The max plate voltage is 2000 volts. The filament voltage is 5.6 volts, which I suspect, since, if it's a radar tube, designed for pulse-service, Eimac often used a higher-than-normal voltage for that use. Anyway, I've got an urge to build something and that tube is so (dare I say) cute that I'd like to build a semi-QRP CW rig around it. Barrie, W7ALW, DN36au, QRV 6M, 432 & 1296 EME __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body. __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Source of very nice inductor and variometer for ATN
What a horrible thing to do to a RA1000. :-( Better to put up a tuned antenna, and restore the RA1000 to service. :-) 73 de Bill, AB6MT [EMAIL PROTECTED] - Original Message - From: "John Lyles" <[EMAIL PROTECTED]> To: Sent: Wednesday, April 11, 2007 4:32 PM Subject: [AMRadio] Source of very nice inductor and variometer for ATN > A classic balanced line antenna tuning network can be built from the output components of a Raytheon RA1000 1 kW transmitter. It was one of the few that used push pull 833As in the RF, and had a symmetric tank with a huge inductor having a small motorized variometer (link coil) in the center for the antenna connection, and a split variable capacitor. The inductor was for AM band, so it has enough L to work down to 160 as well. Keep an eye open for RA1000s getting dumped, not too many left. > 73 > John > K5PRO > __ > AMRadio mailing list > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Partner Website: http://www.amfone.net > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > To unsubscribe, send an email to [EMAIL PROTECTED] with > the word unsubscribe in the message body. __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] AM vs SSB???
Do you mean 45 watts carrier? (180 watts /4). You might get away with this power level at the peak of the sunspot cycle. Otherwise, the transmitter would be suitable as a driver for a linear amplifier. It sounds like a fun project. 73 de Bill, AB6MT [EMAIL PROTECTED] - Original Message - From: "Bob Macklin" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]>; "AM Radio" Sent: Thursday, April 05, 2007 8:52 AM Subject: [AMRadio] AM vs SSB??? What is the difference between 180W PEP AM and 180W PEP SSB? I don't see any. To me the difference is in the demodulator. Ask this question because I have access to a BASKETCASE HW-101. This particular unit has already been used to salvage parts. I have been thinking about rebuilding what's left of it to an AM transmitter using possibly Controled Carrier similar to the DX-60. I could possible get this done by the time the solar cycle improves. Finding a DX-100 or Apache class transmitter seems out of my reach at this time. But my feeling is I could make the HW-101 conversion for less than $200 and I can do it over a period of time. Like at $50/mo! I am a RETIRED SENIOR on FIXED INCOME! Not enough money for hobbies, but LOTS of TIME! Bob Macklin K5MYJ Near Seattle, Wa "Real Radios Glow In The Dark" __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body. __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] AM Forum
- Original Message - From: "A.R.S. - W5AMI" <[EMAIL PROTECTED]> To: "Discussion of AM Radio in the Amateur Service" Sent: Monday, April 02, 2007 11:09 PM Subject: Re: [AMRadio] AM Forum > On 4/2/07, Bill Smith <[EMAIL PROTECTED]> wrote: > > First of all, from what can be heard, the group isn't large, in spite of > > what they would like it to be. It would appear there are 1 or 2 stations > > with others that follow on. The offenders apparently run a tremendous > > amount of power. They are also apparently unusually if not oddly committed, > > as they can be found there 365 days a year. > > > > Second of all, they have taken the belated courtesy of moving at least > > slightly off frequency (perhaps 1kHz) during the AMI net. At calmer > > moments they move off the frequency altogether. That should give you and > > other AM operators the opportunity to check in. It would be very welcome if > > you would operate AM on the AM calling frequency before they get started to > > remind them that they have moved in on a very active AM frequency, or > > suggest to them that they really are interfering. I am, however, afraid any > > attempt at the latter would only reinforce their intent. > > > > I understand 3870 has been a popular AM frequency for approximately 25 > > years, well before the SSB guys in TX took up their roost. I know they were > > not active when I first participated in AM fifteen years ago. In any event > > 3870 is currently identified by the ARRL as the West Coast AM call in > > frequency. It would be a pleasure to think they would be gentlemen enough > > to find a meeting place outside the AM window. > > > > Bill, > > I guess I don't get it. First of all, what does any of this have to > do with the original topic posted? If you have to ask > > Second, what would you have us "5 landers" do? Fight your battles for > you guys in 6 Land? This SSB group is a lot bigger than the 2 or 3 > you suggest, and I for one am not going to lay a carrier on them just > because I can! > There seem to be only one or two, not two or three. I don't think I need to repeat myself, please re-read the post, above. > What exactly are you asking or suggesting "us 5 landers" do for you? > There are groups of 6 and 7 landers that get in between 3880 and 3890 > daily on SSB. Do you think we would suggest you "6 landers" just take > care of that for us? Do you really suggest this is a personal affront? 3870 is in the AM window, and 3870 is recognized by the ARRL as the West Coast Call-In frequency. We would welcome your activity. > > Maybe I'm missing the big point here... > There isn't any "big point." The little point is 3870 is a popular AM frequency in an AM window between 3870 and 3885. 73 de Bill, AB6MT [EMAIL PROTECTED] > 73 > w5ami > __ > AMRadio mailing list > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Partner Website: http://www.amfone.net > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > To unsubscribe, send an email to [EMAIL PROTECTED] with > the word unsubscribe in the message body. __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] AM Forum
- Original Message - From: "A.R.S. - W5AMI" <[EMAIL PROTECTED]> To: "Discussion of AM Radio in the Amateur Service" Sent: Monday, April 02, 2007 8:18 PM Subject: Re: [AMRadio] AM Forum > On 4/2/07, Bill Smith <[EMAIL PROTECTED]> wrote: > > I for one would like to see 5-land AM activity on 3870. We seem to have a > > very active, if few in number, contingent of SSB operator(s) on the West > > Coast Calling Frequency. Where are AM operators? There is only one station > > from Oklahoma who checks in regularly to the West Coast AMI net, Wednesday's > > at 8:00pm, 7:00pm Central Time. He also participates in groups that form on > > other nights of the week. > > > > If there are > 100 stations operating AM in Texas, why none on 3870? > > > Bill, > > There is a large SSB group in Texas on 3870 every night, all night > long. I have checked into the AMI net on 3870 myself, but only when > the band went long and the SSB guys in TX couldn't hear me, and I > couldn't hear them. The time your AMI starts is prime time for this > Texas SSB group, and I would be breaking rules if I jumped in on AM > right on top of them to check in. First of all, from what can be heard, the group isn't large, in spite of what they would like it to be. It would appear there are 1 or 2 stations with others that follow on. The offenders apparently run a tremendous amount of power. They are also apparently unusually if not oddly committed, as they can be found there 365 days a year. Second of all, they have taken the belated courtesy of moving at least slightly off frequency (perhaps 1kHz) during the AMI net. At calmer moments they move off the frequency altogether. That should give you and other AM operators the opportunity to check in. It would be very welcome if you would operate AM on the AM calling frequency before they get started to remind them that they have moved in on a very active AM frequency, or suggest to them that they really are interfering. I am, however, afraid any attempt at the latter would only reinforce their intent. I understand 3870 has been a popular AM frequency for approximately 25 years, well before the SSB guys in TX took up their roost. I know they were not active when I first participated in AM fifteen years ago. In any event 3870 is currently identified by the ARRL as the West Coast AM call in frequency. It would be a pleasure to think they would be gentlemen enough to find a meeting place outside the AM window. 73 de Bill, AB6MT [EMAIL PROTECTED] __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] AM Forum
I for one would like to see 5-land AM activity on 3870. We seem to have a very active, if few in number, contingent of SSB operator(s) on the West Coast Calling Frequency. Where are AM operators? There is only one station from Oklahoma who checks in regularly to the West Coast AMI net, Wednesday's at 8:00pm, 7:00pm Central Time. He also participates in groups that form on other nights of the week. If there are > 100 stations operating AM in Texas, why none on 3870? 73 de Bill, AB6MT [EMAIL PROTECTED] - Original Message - From: "Jim Wilhite" <[EMAIL PROTECTED]> To: "Discussion of AM Radio in the Amateur Service" Sent: Monday, April 02, 2007 7:37 PM Subject: Re: [AMRadio] AM Forum > Good question Bill. I don't see many from the West coast > participating even though there are several members out > there. > > I don't believe anyone sets the border, as you put it, but > most posts from anywhere outside of the group is mostly > ignored. Technical questions have limited participation if > they originate from anywhere South of Virginia. > > There was a member of that board who did not have a license > that posted for quite a while. He was a friend of someone > back in the area in question and had moved to California. > First question, what is a guy with no license doing posting > on a ham board? Second question why would the majority of > posting members respond to even his personal posts when they > barely will answer anything most of us South of Virginia and > West of the Mississippi put up? > > Jim > W5JO > > > > > > > > Frankly, it is hard to tell from where a post originates. > > Doubt there is > > even the least effort to ignore a post only because of its > > geographic > > source. For example, who sets the borders of posts to > > ignore? Further, who > > sets the borders of responses to watch? > > > > Nonsense! > > > > Belton? Deerfield? How about the West Coast? GUD? > > > > 73 de Bill, AB6MT > > [EMAIL PROTECTED] > > > > > __ > AMRadio mailing list > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Partner Website: http://www.amfone.net > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > To unsubscribe, send an email to [EMAIL PROTECTED] with > the word unsubscribe in the message body. __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] AM Forum
Frankly, it is hard to tell from where a post originates. Doubt there is even the least effort to ignore a post only because of its geographic source. For example, who sets the borders of posts to ignore? Further, who sets the borders of responses to watch? Nonsense! Belton? Deerfield? How about the West Coast? GUD? 73 de Bill, AB6MT [EMAIL PROTECTED] - Original Message - From: "Jim Wilhite" <[EMAIL PROTECTED]> To: "Discussion of AM Radio in the Amateur Service" Sent: Monday, April 02, 2007 4:15 PM Subject: Re: [AMRadio] AM Forum > Mike, ever check the responses to posts from 5 Land. Might > as well be invisible. Who cares about Deerfield Belton > is coming up and no one up there cares. > > Jim > W5JO > > > > > As the show states, "Pardon the Interruption" but who is > > being ignored on > > the AM Fone list?? > > Mod-U-Lator, > > Mike(y) > > W3SLK > > > __ > AMRadio mailing list > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Partner Website: http://www.amfone.net > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > To unsubscribe, send an email to [EMAIL PROTECTED] with > the word unsubscribe in the message body. __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Motor revisited
Make that BT-20-A - Original Message - From: "Bill Smith" <[EMAIL PROTECTED]> To: "Discussion of AM Radio in the Amateur Service" Sent: Monday, April 02, 2007 12:29 PM Subject: Re: [AMRadio] Motor revisited > > - Original Message - > From: "Rick Brashear" <[EMAIL PROTECTED]> > To: "'Discussion of AM Radio in the Amateur Service'" > > > > I have been unable to find a 2 RPM Synchron motor for the timing delay on > > the old GE BT-20-A I am bringing back to life. I can find plenty 1 RPM, > > however. Other than taking a full minute to allow B+ to be activated > > instead of 30 seconds, I can see no reason why it wouldn't serve the same > > purpose. I sometimes overlook the obvious, can any of you guys see > reason > > why this would not work? > > > > Thanks, > > Rick/K5IZ > > The manual states a delay of 30 seconds delay due to the operation of 1K1. > Perhaps the motor has been changed in the BA-10A here, but the measured > delay is 1 minute. The motor looks original (can't read the speed without > disassembling the unit). > > Never noticed the additional delay here, other than normal impatience. > > If you replace the motor, make sure it has either the correct gearing or an > extended shaft. It doesn't look like a generic motor to me. > > Bill > > __ > AMRadio mailing list > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Partner Website: http://www.amfone.net > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > To unsubscribe, send an email to [EMAIL PROTECTED] with > the word unsubscribe in the message body. __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Motor revisited
- Original Message - From: "Rick Brashear" <[EMAIL PROTECTED]> To: "'Discussion of AM Radio in the Amateur Service'" > I have been unable to find a 2 RPM Synchron motor for the timing delay on > the old GE BT-20-A I am bringing back to life. I can find plenty 1 RPM, > however. Other than taking a full minute to allow B+ to be activated > instead of 30 seconds, I can see no reason why it wouldn't serve the same > purpose. I sometimes overlook the obvious, can any of you guys see reason > why this would not work? > > Thanks, > Rick/K5IZ The manual states a delay of 30 seconds delay due to the operation of 1K1. Perhaps the motor has been changed in the BA-10A here, but the measured delay is 1 minute. The motor looks original (can't read the speed without disassembling the unit). Never noticed the additional delay here, other than normal impatience. If you replace the motor, make sure it has either the correct gearing or an extended shaft. It doesn't look like a generic motor to me. Bill __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] More electricity
Did you practice this exercise just before a test? :-} - Original Message - From: "D. Chester" <[EMAIL PROTECTED]> To: Sent: Friday, March 30, 2007 10:27 PM Subject: [AMRadio] More electricity > In high school we used to play a variation of "chicken" using a telephone > magneto. Several people would join hands in a circle, except for two who > would each grab one hand onto a wire attached to one of the terminals of the > magneto. Then an "assistant" would start cranking the magneto - slowly at > first, then faster and faster until someone let go. The first person to let > go was the "chicken". That person would drop out, and the rest of the group > would reassemble and try again, and again, each time eliminating one person. > The last person remaining was the winner. > > Don k4kyv > > __ > AMRadio mailing list > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Partner Website: http://www.amfone.net > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > To unsubscribe, send an email to [EMAIL PROTECTED] with > the word unsubscribe in the message body. __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Timer Motor
- Original Message - From: "Rick Brashear" <[EMAIL PROTECTED]> To: "'Discussion of AM Radio in the Amateur Service'" Sent: Friday, March 30, 2007 5:31 PM Subject: [AMRadio] Timer Motor > Does anyone know of a source for Synchron timer motors? I'm in need of a > Model 610, 3 watt, 2 RPM with CW rotation. Google found some 1 RPM as did > eBay, but no 2 RPM. > Thanks, > Rick Hi Rick, I've fixed two of the delay assemblies, one in a BC-10 and the other in a XT-1A. I had more trouble with the one-way clutch. In both cases, cleaning eventually did the trick, using WD-40, STP Silicon Spray, etc. The Telechron motor movement is all gears inside. If it is stalling, you might try applying solvent around the opening for the gear, and if it runs, let it run for a while to see if you can get the gears to mix up the goo. In the extreme, (last chance) you can drill a very small hole in the case (am not sure where, and don't let the drill penetrate the body of the mechanism) and apply a small amount of light machine oil through the hole. There should be hints on how to rescue the motor on the web. Bill __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] More electricity
- Original Message - From: <[EMAIL PROTECTED]> To: "Discussion of AM Radio in the Amateur Service" > When I was in High School Voc.Tech. in the late 60's we used to charge up a good axial H.V. electrolytic with the leads wrapped around the ends and say catch, to an unspecting classmate. > We also did the,... hold on to two can lytics with the cans connected to the cap tester, a big CDE, and see how high the leakage test voltage would get before letting go. > > Betcha I'm not the only one with these type memories ;) > > Bill, > KB3DKS/1 One wonders how many people have been left with a deep sense of awe and fear due their unfortunate early contact with electricity. Seems this was something of a very wide practice. Maybe that is why there aren't any electric shops left in High Schools. ;^) Bill __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] electricity
- Original Message - From: "John Lawson" <[EMAIL PROTECTED]> .>Back in the day - there were batteries available for 'photoflash' > applications 450 terminal volts. > > "here, taste this big 9-v battery" FLASH! :^0 __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] electricity
- Original Message - From: "VJB" <[EMAIL PROTECTED]> > Man, with all the warnings on here about voltage, it's > enough to make me quit licking 9V batteries as a test. . Definitely bad taste. __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] RCA Console
Hi Rick, I don't recall seeing any. RCA made custom equipment, and control consoles for transmitters above 5 Kw. They were not remote control but were designed for emplacement in front of the large transmitters. Don't know if they made a panel for the 1R. That doesn't mean much, as only have limited information. Have seen one panel with a Gates label and worked with a similar panel made by Rust (to control a 1MX), but don't know who actually made it. The Rust unit used GE meters, and the Gates used Weston meters. Bill - Original Message - From: "Rick Brashear" <[EMAIL PROTECTED]> To: "'Discussion of AM Radio in the Amateur Service'" Sent: Monday, March 26, 2007 4:07 PM Subject: RE: [AMRadio] RCA Console Thanks Bill for the information. My BT was a typo and should have been BTA, sorry, I got trigger happy. That is very interesting about the history of broadcasting. I guess I am asking more about the BTA 1R2. Several of it's functions are wired in such a way to allow for remote operation. Not everything, but enough to make it reasonably easy. On/Off, power level, crystal, etc. are all included. I am just wondering if RCA or another manufacturer made a console capable of handling the options already built in to the BTA series? Rick By BA series you must mean the BTA- for AM transmitters and BTF- for FM transmitters. Consoles were identified... __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body. __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] RCA Console
- Original Message - From: "Rick Brashear" <[EMAIL PROTECTED]> > When the mighty RCA BT series were in regular use, was there a particular > broadcast console that would take advantage of all the remote capabilities > of the transmitter? > Rick/K5IZ By BA series you must mean the BTA- for AM transmitters and BTF- for FM transmitters. Consoles were identified by another series, for example BC-, or by their numbers such as the 76-A, B and C. In the earliest years when this equipment was state of the art, the FCC required a transmitter engineer to be at the transmitter site during all hours of broadcast. He was required to possess a First Class Radiotelephone license, and as part of his duties, he took meter readings every 1/2 hour and adjusted the transmitter to maintain frequency and power output. Many stations of that era did not broadcast twenty-four hours a day, in fact most signed off at or before midnight. As a custom, all stations signed off and signed on by proudly playing the Star Spangled Banner. As a consequence, many studios were co-located at the transmitter site, and station operators were put though a one-weekend wonder course to obtain a First Class license. Later on, in the late 50's, rules were relaxed somewhat and unattended transmitters could be monitored by station metering at a remote studio. Transmitter control and meter readings were still required each 1/2 hour. By 1961, operators possessing a Third Class license were permitted to operate the station and turn on and off the transmitter. Meter readings were still required, and a First Class licensed engineer was required to work on the transmitter. Many transmitter designs of this era were not designed to by operate remote control. Many had thermal-controlled overload circuit-breaker switches and some contained fuses. Tuning was accomplished by front panel controls. Further, the FCC restricted transmitter equipment by certification; a transmitter had to be type-accepted or specially certified to broadcast and no electrical changes or equipment modifications were permitted. Accordingly, companies such as Rust created rube-goldberg attachments which could be bolted on the front of a transmitter such as a RCA BTA-1MX to enable remote control. They included big ugly motor driven articulated arms which could grasp the lever of a circuit breaker and toggle the breaker on or off. The transmitter's metering circuits were tapped (but could not be broken) to provide remote meter readings. Stepper switches, synchronized between the transmitter site and the remote studio, were used to select metering circuits for remote display. Additional motor driven devices were bolted onto the front of the transmitter to allow plate tuning or increase and decrease in power output. With these modifications, the transmitter was rendered as almost unrecognizable. If a fuse failed, an engineer had to travel to the transmitter site and replace it. Later design transmitters such as the Bauer 707 provided integral remote control capabilities. 73 de Bill, AB6MT [EMAIL PROTECTED] __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] 4-400 first made when?
- Original Message - From: <[EMAIL PROTECTED]> To: Sent: Friday, March 23, 2007 1:09 PM Subject: Re: [AMRadio] 4-400 first made when? > Brad and the group, > > My posting said 20Jno such animal to my knowledge. My > age is allowing the thoughts of the 20V2 and the 300J to run together. > I should have said, "the transmitter was a Collins 300J and the upgrade > made it a 20V-2." Now I feel better. I'm reasonably sure we changed > some iron but thats been a long time ago. We did add a Rube Goldberg > designed homebrew solenoid arrangement that allowed use of the power > cutback switch. The station ran 1kw day, and .25kw night. The > transmitter was remotely controlled and if I remember correctly, the > R/C unit was made by RUST, Corp.. I'd suggest getting a schematic of > the 20V-2 and comparing it with the 300J to make your restoration a bit > easier. > > Funny, I can still remember the Ep , Ip and I (ant) plus the antenna > resistance. 1500v, .225a, .73a and 470 ohms. (.25kw readings) > For the 1kw power setting they were 3100v, .455ma, 1.49a and 470 ohms. > I must have read those meters hundreds of times. We were always wary > of an FCC visit. And we had one or two while I was CE. > > Those were the days. Brad, if you were close by I'd volunteer to > assist in bringing the old transmitter back to life. They were > excellent pieces of gear. > > Gud luck es 73 > > Chuck > W4MIL It is funny.. I have a terrible memory for names, can't remember a name 3 seconds after I have heard it. But the 550A-1 meter readings (3870 KHz) are, from memory: Ep, Ip, I(ant) and antenna resistance: 2000v, .225a, 2.6a and 50 ohms (375 watt reading). For the 1kw power setting they are 3000v, .500a (nominal), 4.9a and 50 ohms (1kw). Naturally, the transmitter is run at the 375 watt level. They are excellent transmitters. Interestingly, the transmitter runs with filaments on most of the time it is on at all, but the 4-400's have actually improved with use. They were 80%'ers but now put out better than full power. Guess they like Amateur AM service. If I keep running them, think they'll reach 130%? ;-) 73 de Bill, ab6mt [EMAIL PROTECTED] __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] 4-400 first made when?
- Original Message - From: "John Lawson" <[EMAIL PROTECTED]> To: Sent: Friday, March 23, 2007 7:16 AM Subject: [AMRadio] 4-400 first made when? >In doing some research - I notice that the 4-400 seems to be a fairly > late arrival, at least as far as RCA is concerned. It's in none of my > HB-3s, not in my 1962 TT5, but is in the 1975 TT5 manual. Since my > transmitting tube library has this 12-year gap, I'm assuming RCA began to > produce the device sometime after 1964... does anyone have better info on > the history and development of this very 'popular' power tube? > >Thanks in advance for any enlightenment! > Okay - over and out... > > Cheers > > John > KB6SCO > DM09fg Hi John, Eimac, known then as Eitel-McCullough, as well as a number of other tube manufactures faced a dilemma at the end of WWII. Millions of tubes had been manufactured and were glutting the market. Tube manufactures, who had a good run during the war, faced a consumer market when the war ended. With all the surplus tubes available they had to develop a new market to survive. That is why (and when) the air-cooled tube family of power tubes was introduced. 4-65, 4-250, 4-400, 4-1000 were only some of the models of the new designs. Unfortunately, some companies, such as Heinz and Kaufman were trapped by accepting late contracts from the military. The contracts kept the business alive for a short time after the war ended, but when the contracts ran out, H&K found themselves out of the consumer market. They never could catch up. Bill __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Tube Data
Try: http://www.datasheets.electron-tube.net/sheets/084/3/3B24WA.pdf 73 de Bill, ab6mt [EMAIL PROTECTED] - Original Message - From: "Rick Brashear" <[EMAIL PROTECTED]> To: "'Discussion of AM Radio in the Amateur Service'" Sent: Sunday, March 11, 2007 5:24 PM Subject: RE: [AMRadio] Tube Data > Oops! Sorry, I meant 371B. > Rick > > -Original Message- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Rick Brashear > Sent: Sunday, March 11, 2007 8:23 PM > To: AMRadio@mailman.qth.net > Subject: [AMRadio] Tube Data > > I thought I had a manual for every tube I'd ever need, but I can't see to > fond any info on a 571B rectifier. Anyone have the specs? > Thanks, > Rick > > __ > AMRadio mailing list > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Partner Website: http://www.amfone.net > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > To unsubscribe, send an email to [EMAIL PROTECTED] with > the word unsubscribe in the message body. > > __ > AMRadio mailing list > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Partner Website: http://www.amfone.net > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > To unsubscribe, send an email to [EMAIL PROTECTED] with > the word unsubscribe in the message body. __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] new antenna (again).
- Original Message - From: "Brett gazdzinski" <[EMAIL PROTECTED]> To: "'Discussion of AM Radio in the Amateur Service'" Sent: Saturday, March 10, 2007 4:46 PM Subject: RE: [AMRadio] new antenna (again). > Yes, I worked on it most of today, the 80 meter > portion was ok for the most part, the 40 meter section was acting > crazy, and kept getting tangled up with the 80 meter part. This form of antenna is a bit unwieldy. The 40 meter element must be located below the 80 meter element. It helps if you have separate guy lines for the two elements. It also helps if you match the tenson in the wires, but the antenna can still twist. Once it is up, however, it is stable. > SWR at 7290 was 5 to 1. That is bad. > I added lengths to the end of the 40 meter part but > it just acted nuts, the 80 and 40 meter segments were interacting.. The 80 meter element should behave as a regular dipole, but the 40 meter element (and any highter band elements) will interact. Typically the shorter elements should be cut about 10% longer than the formula. To tune a dipole, start with the 468/frequency formula. Cut the wire a little long. Install the antenna an measure the frequency with the lowest SWR. Use this frequency and the known length of the antenna to calculate a new constant. New constant = length * measured-frequency. Then use the new constant and the design frequency to calculate a new length. Cut the antenna to the new length and repeat. It shouldn't take more than one or two tries to obtain resonance at the desired frequency. You may not achieve perfect 1:1 SWR on the shorter elements, and the SWR bandwith of the shorter elements will be much smaller. However, an antenna tuner can be used to clean up the mismatch, and the antenna will work very well. One way to reduce interaction is to separate the 80 and 40 meter elements. In the extreme, and If you have room, separate the 80 and 40 elements horizontally 90-degrees from each other (as in the form of a cross). > > > I gave up and took it down, cut the 40 meter section off, > and changed to open wire line feeder from the antenna to rooftop. You made a different antenna. It is no longer a classic dipole. A dipole is two extended wires of resonant lenght. It has a feedpoint impedance that varies between 40-120 ohms depending upon height above ground. > > So I had 60 foot each side and about 40 feet of open wire line, > and the heath kit antenna tuner arced at high power > under modulation on 80 meters. Low antenna resistance. High degree of mismatch between the feedline and the radiating wire. The antenna is likely hard to tune and problaby will have poor performance. > > I tried adding 30 feet of open wire line, no improvement. > I then cut the antenna down to 50 feet each side, with 40 feet of > open wire line (roughly G5RV lengths) and it works fine again. The feedline is not acting as feedline but acting like it is part of the antenna. There could be signal cancellation. > > I will have to think about what to try next. > > Brett > N2DTS > > > > > > -Original Message- > > From: [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED] On Behalf Of Bill Smith > > Sent: Saturday, March 10, 2007 12:26 AM > > To: Discussion of AM Radio in the Amateur Service > > Subject: Re: [AMRadio] new antenna (again). > > > > Hi Brad, > > > > It sounds like you had the ideal antenna to begin with. > > There is nothing > > wrong if the antenna is a bit "long." Short antennas' > > radiation reisistance > > takes a nose dive. > > > > I've used a similar antenna for years and have enjoyed great > > performance. > > > > 73 de Bill, ab6mt > > [EMAIL PROTECTED] > > > > > > - Original Message - > > From: "Brett gazdzinski" <[EMAIL PROTECTED]> > > To: "'Discussion of AM Radio in the Amateur Service'" > > > > Sent: Friday, March 09, 2007 6:26 PM > > Subject: RE: [AMRadio] new antenna (again). > > > > > > > > > > I took down the alpha delta dx-dd and the homebrew G5RV, and put > > > up an 80 and 40 meter dipole fed with the same coax. > > > > > > Keeping them from twisting up was a chore, what with them getting > > > snagged in the smaller trees on the way up. > > > > > > Anyway, I got it up and put the 756 pro into it, and tuned > > > across 80 and 40 meters, resonance was at 3750 and 7176, about > > > 1.2 to 1 swr, and broad banded... > > > > > > So I cut a foot off each end of each dipole, and got > > > 3887 and
Re: [AMRadio] new antenna (again).
- Original Message - From: "Brett gazdzinski" <[EMAIL PROTECTED]> To: "'Discussion of AM Radio in the Amateur Service'" Sent: Saturday, March 10, 2007 4:57 PM Subject: RE: [AMRadio] new antenna (again). > Bill, > > The ARRL antenna book as lengths to use, but only on balanced > antennas and tuners. They say grounding one side > introduces to many variables, its cut and try with coax. The formulas in the ARRL antenna book (and from various other sources) specifiy antenna length based upon an ideal antenna in infinate space. In practical antennas, ground effect is probably the largest influence, but surrounding structures can also have an impact. Grounding one side of the antenna changes the antenna pattern slightly, but with all the other influences on the antenna, unbalancing the dipole probably has little if any overall impact. The main effect is RF current can travel down (and radiate from) the outside of the coaxial cable. It can generally be discounted, or you can install ferrite beads over the coax at the antenna feed point. You will find this described as a "current balun" in the literature. In amateur service, where operations cover a wide frequency range, antennas are not necessarily operated at their resonant frequency. Antenna tuners are used to match the transmitter to the load (which is the antenna and feed line), but the antenna may still be operating off-resonance. When the antenna is operated off-resonance, it no longer presents a resistive load to the feed line, SWR increases and the feed line radiates. While it is very important to couple RF from the transmitter to the antenna, "high" SWR (within limits) is not necessarily a bad thing. The goal is to set up the antenna and feed line as a system to couple energy to the atmosphere. It is very important to raise the antenna to its full operating position when you make SWR measurements. The SWR of a wire antenna will change with height, especially when the antenna is less than 1/4 wave height above ground. 73 de Bill, ab6mt [wrong Bill] > > As it is, with the G5RV, I have only about 30 feet of RG214 coax > in line, so high swr will not cost me much. > > If I was to ADD coax to get away from a high voltage point, that > is only going to increase the loss in the coax. > > At least that's the way I see it... > > Brett > N2DTS > > > > > Brett, > > Heard you thursday loud and clear in northwestern Mass. > > > > When I had my station setup down in PA my dipole was a > > similiar 75/40 double wire from a single coax with half the > > 75 flattop along the roof peak and then zigged down to a > > garage roof and zagged back up to a window ledge. > > The 40 was flat on top at an angle and a single slope to the > > other corner of the garage roof. > > Did have some rf in the shack being under the wire but it > > was no closer than 25 feet at any point. > > > > The problem with single feed coax to a dual 40/75 wire is > > that the coax length does not work out for both bands. > > Somewhere I found a chart or formula for figuring this out > > and there is one length that is close. > > Resonance was checked with the wire as run then I added a > > piece and checked again but found removing a similiar length > > got it about in for 75 with 1.5 or so SWR with 40 just a bit worse. > > > > Does anyone here know where that coax length table was? > > Might have been an Antenna Hndbk or regular Handbk or online.. > > > > Bill, KB3DKS/1 > > > > __ > > AMRadio mailing list > > List Home: http://mailman.qth.net/mailman/listinfo/amradio > > Partner Website: http://www.amfone.net > > Help: http://mailman.qth.net/mmfaq.html > > Post: mailto:AMRadio@mailman.qth.net > > To unsubscribe, send an email to [EMAIL PROTECTED] with > > the word unsubscribe in the message body. > > > > __ > AMRadio mailing list > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Partner Website: http://www.amfone.net > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > To unsubscribe, send an email to [EMAIL PROTECTED] with > the word unsubscribe in the message body. __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] new antenna (again).
Hi Brad, It sounds like you had the ideal antenna to begin with. There is nothing wrong if the antenna is a bit "long." Short antennas' radiation reisistance takes a nose dive. I've used a similar antenna for years and have enjoyed great performance. 73 de Bill, ab6mt [EMAIL PROTECTED] - Original Message - From: "Brett gazdzinski" <[EMAIL PROTECTED]> To: "'Discussion of AM Radio in the Amateur Service'" Sent: Friday, March 09, 2007 6:26 PM Subject: RE: [AMRadio] new antenna (again). > > I took down the alpha delta dx-dd and the homebrew G5RV, and put > up an 80 and 40 meter dipole fed with the same coax. > > Keeping them from twisting up was a chore, what with them getting > snagged in the smaller trees on the way up. > > Anyway, I got it up and put the 756 pro into it, and tuned > across 80 and 40 meters, resonance was at 3750 and 7176, about > 1.2 to 1 swr, and broad banded... > > So I cut a foot off each end of each dipole, and got > 3887 and 7500! > Quite a jump from 7176 to 7500! > > Tomorrow I will lower it and solder on some pig tails to > the 40 meter section that I can trim without redoing the > entire antenna. > > Seems to work well, on receive anyway, and I will like > changing bands without changing antenna's or using a tuner. > > The 80 meter section goes through the trees and bends down > a little, but I used insulated wire. > > Brett > N2DTS > > > __ > AMRadio mailing list > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Partner Website: http://www.amfone.net > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > To unsubscribe, send an email to [EMAIL PROTECTED] with > the word unsubscribe in the message body. __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Antenna experiments...
Hi Brett, Generally, you can bend an antenna all over the place as long as you = keep the center straight and in the air. Don't bend the ends more than = 90 degrees or you will introduce cancellation with the other part of the = antenna. Bends introduce all sorts of funny patterns, but overall the = antenna will work better than shorter antennas with coils. If you can, = keep the antenna somewhat symmetrical (bends on both ends). =20 Another way to take three or so feet off each end (that is, shorten the = antenna) is to attach a copper toilet bowl float at each end of the = antenna. The floats act as giant capacitors. Sometimes a delta-loop will fit where a dipole won't. They are great = antennas. For 80 meters, the sides of the triangle need to be about 90' = each. Good stringing! 73 de Bill, AB6MT [EMAIL PROTECTED] - Original Message - From: Brett gazdzinski To: 'Discussion of AM Radio in the Amateur Service' Sent: Saturday, March 03, 2007 4:50 PM Subject: RE: [AMRadio] Antenna experiments... I received my new alpha delta dx-dd antenna, its for 80 and 40 meters, is about 82 feet long, has 2 coils at about 35 feet from center, and then about 3 or 4 feet of wire to the end insulator. The way they get it to work is to make the coils have a lot of inductance to separate the 40 meter from the 80 meter section, but that makes the 80 meter section very short. On 40 meters, it worked like a 40 meter resonant dipole, and you can get the swr down very low, on 80 meters, you can get the swr down, but I think it works like a 40 meter dipole on 80 meters Band conditions have been poor, I heard nothing on 40 meters so I tuned in chu which is real far away and comes in on the vertical antenna well, the home made g5rv well, and the dx-dd a little less well. Noise on the dx-dd seems high on both 40 and 80, but it's a little lower then the g5rv and its over the house. On 80 meters, the home brew g5rv is tops, the butternut vertical seems worthless, and the dx-dd between the two. I got the dx-dd mostly as an experiment, to see how the home made g5rv compared noise wise to another antenna. Now that its warming up outside, I can do more antenna experiments... What would happen if I made the g5rv about 120 feet long by passing the wire through the trees and down, instead of ending it at an insulator at the tree? With about 35 feet of open wire line, then into coax, would the swr be low on 80 without a tuner? Brett N2DTS __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body. __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Knobs
Just for the record, the fan-shaped knobs mentioned below are not fan-shaped, but apparently circular, or cone-shaped. Centralab used to make a flat, fan-shaped knob for their lever switches. I don't know if they are still available, or in what colors. They, and the oval-shaped knobs were readily available in red, white and black. Bill - Original Message - From: Bill Smith To: Discussion of AM Radio in the Amateur Service Sent: Friday, March 02, 2007 6:38 PM Subject: Re: [AMRadio] Knobs Mouser Part No. 690-5149A black, oval Mouser Part No. 690-SSKW white, fan shaped Mouser Part No. 690-SSKB black, fan shaped I didn't realize they still had the fan shaped knobs also. My catalog is a bit old, hope they still stock them. Antique Electronics Supply carries many Fender parts, they may have them also. 73 de Bill, AB6MT [EMAIL PROTECTED] - Original Message - From: Rick Brashear To: Discussion of AM Radio in the Amateur Service Sent: Friday, March 02, 2007 6:01 PM Subject: Re: [AMRadio] Knobs Thanks, Bill. I'll go over there and check it out. I was in vintage mode and didn't even think they might still be around. I had another gent remind me they are used on the Fender Tele. I kept thinking I had seen some around here some where and I had, but they're on my Tele! Sometimes I can't see the forest for the trees. Thanks a million. Rick/K5IZ Bill Smith wrote: >They are still available new from Mouser Electronics. They were Centralab >knobs, but think now are offered by another company. > >They aren't $0.25 anymore, either. > >Bill > > > > __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body. __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body. __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Knobs
Mouser Part No. 690-5149A black, oval Mouser Part No. 690-SSKW white, fan shaped Mouser Part No. 690-SSKB black, fan shaped I didn't realize they still had the fan shaped knobs also. My catalog is a bit old, hope they still stock them. Antique Electronics Supply carries many Fender parts, they may have them also. 73 de Bill, AB6MT [EMAIL PROTECTED] - Original Message - From: Rick Brashear To: Discussion of AM Radio in the Amateur Service Sent: Friday, March 02, 2007 6:01 PM Subject: Re: [AMRadio] Knobs Thanks, Bill. I'll go over there and check it out. I was in vintage mode and didn't even think they might still be around. I had another gent remind me they are used on the Fender Tele. I kept thinking I had seen some around here some where and I had, but they're on my Tele! Sometimes I can't see the forest for the trees. Thanks a million. Rick/K5IZ Bill Smith wrote: >They are still available new from Mouser Electronics. They were Centralab >knobs, but think now are offered by another company. > >They aren't $0.25 anymore, either. > >Bill > > > > __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body. __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Knobs
They are still available new from Mouser Electronics. They were Centralab knobs, but think now are offered by another company. They aren't $0.25 anymore, either. Bill - Original Message - From: Rick Brashear To: AMRadio@mailman.qth.net Sent: Friday, March 02, 2007 5:31 PM Subject: [AMRadio] Knobs Would anyone happen to have a surplus of knobs for lever type switches? Not the long, round ones, but the square type. I have a couple of pictures of it at the link below. They go on a Gates Studioette console. http://amfone.net/Amforum/index.php?board=34.0 Thanks, Rick/K5IZ __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body. __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Low modulation Gates BC-1T
Hmm... you may have shorted turns in the modulation transformer, but it is difficult to know without terminating the secondary with a resistive load, and measuring the power output. I would assume the transformer is the correct part and hasn't been subsituted somewhere along the way. Frustrating! 73 de Bill, AB6MT [EMAIL PROTECTED] - Original Message - From: [EMAIL PROTECTED] To: amradio@mailman.qth.net Sent: Sunday, February 25, 2007 12:34 PM Subject: Re: [AMRadio] Low modulation Gates BC-1T I just confirmed that the grids of the 833s are indeed being fed 180 degrees from each other. One signal had more RF from the driver (only low B+ was on) than the other, but otherwise all seemed normal. Steve ** AOL now offers free email to everyone. Find out more about what's free from AOL at http://www.aol.com. __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body. __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Low modulation
I still suspect a phasing problem, perhaps a double error. For example, the feedback may not be crossed correctly at the input transformer, and to compensate, the output transformer could be wired out of phase. Do you have a dual-trace oscilloscope and can you look at phasing throughout the modulator stages? Another thought is to temporarily disable one half of the push-pull circuitry, perhaps by removing tubes. If you get more output from one-half the circuit, it would verify a phasing problem. Wonder also if you have a large power resistor (200 w) of 2500-5000 ohms you can temporarly substitute across the secondary of the output transformer. Any modulation should heat it up fairly quickly and would proove the function of the modulator circuit. Bill - Original Message - From: [EMAIL PROTECTED] To: amradio@mailman.qth.net Sent: Saturday, February 24, 2007 7:59 PM Subject: Re: [AMRadio] Low modulation My Gates BC-1T still resists my troubleshooting efforts. For the mod reactor I substituted a big power transformer's secondary which measured 45 H - no difference. I temporarily substituted a 1 uF 4000v cap for the 2 uF @ 3 kVon the low end of the modulation xfmr secondary - no difference, still very low mod yet the 833s are working reasonably hard. I then used that big transformer to bench test the mod transformer as per Don's suggestions. I applied its output, 60 Hz 2700 VAC, to the primary of the mod xfmr, then secondary, then each half of the secondary - in all cases I got what I expected on the other end (and no tripped breaker or other bad sign). Then I put it all together again and gave it one more try. I hit the go button and heard a low level, high-pitched squeal and saw a wisp of smoke rise from the back side of the mod transformer. I dropped the plates back off immediately. The squeak made me suspect that I'd accidentally swapped the feedback lines at the mod xfmr primary, and indeed I had. This led me to inspect the transformer's backside a bit more closely. There is a terminal exiting each set of windings with a jumper between. I'd noticed before that the terminals were at the extreme ends of "slots" in the outer cover. Now the terminals were no longer at the end, but about 1/3 of the way back across the slot. The windings had shifted? I bet there were not slots there originally, but something made the windings shift before and cut the slots. And the stress of my feedback error had shifted them back part of the way. In spite of its reasonable behavior in my bench tests, I think I need a mod transformer. Any thoughts or other suggestions? Steve WD8DAS ** AOL now offers free email to everyone. Find out more about what's free from AOL at http://www.aol.com. __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body. __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Low modulation
I notice from the schematic, that there is also a tertiary winding which is fed to the the driver stage. Seems a long shot, but could it be out of phase? Also, what are you using to measure the capacitor. A digital capacitance meter will mask a poor power factor. In other words, the cap could still be open. Can you substitute another? Bill - Original Message - From: [EMAIL PROTECTED] To: amradio@mailman.qth.net Sent: Monday, February 19, 2007 3:38 PM Subject: Re: [AMRadio] Low modulation [EMAIL PROTECTED] writes: > Mod Reactor shorted? Ohms-out OK on a Simpson 260, but perhaps a problem under higher voltage? > The cap to ground off the bottom of the Mod secondary good? It measures the expected 4 uF value. Bob wrote: >Does that thing use feedback? Yes, and I've tried it with the feedback ladder disconnected - no difference. >How about running solid tone for maybe five minutes. >And then look for something that's overly warm. Good thought - thanks. Steve WD8DAS __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body. __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Capacitors
According to Hoyle (was he a ham?) use ceramic capacitors for bypass in the front end of the receiver (RF, oscillator and mixer stages) and use tubulars for bypass and coupling in the IF, bfo, audio and other low frequency stages. I've used tubulars throughout, too, and they work fine. I am sure ceramics would also, just can't bring myself to put those flimsy things throughout an old receiver. In fact, I've taken them out when found as replacements. Long ago, heard that the inductance inherent in tubular capacitors was factored-in when designing RF coils, but I seriously doubt it. When replacing components, use the original gound points and component placement. 73 de Bill, AB6MT [EMAIL PROTECTED] - Original Message - From: Rick Brashear To: AMRadio@mailman.qth.net Sent: Friday, December 29, 2006 8:15 PM Subject: [AMRadio] Capacitors What type of capacitors I should use to replace the paper Astron and West-Cap capacitors in the rf strip on the sp-600? I have a good stock of new Sprague Orange Drops or I can use ceramic disk. I don't want to have to do this again. Of course, at my age, it's doubtful that will happen! Thanks... Rick/K5IZ __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net
[AMRadio] 80 Meters Wide Open Tonight (Tues. Dec. 26)
Bill, at K6BW, Novato CA worked Brent, W1IA, Derry NH Coast - to - Coast AM on 3870! Great signals both ways. Bill was using a Collins 550-A1 Broadcast Transmitter, 80 meter sloper; Brent was using a 300w class-E homebrew transmitter, dipole antenna. Thank you for the contact, Brent! Happy New Year 73 de Bill, AB6MT [EMAIL PROTECTED] __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net
Re: [AMRadio] RCA Transmitter Rescue trip report
Hi John, You might enjoy the following: http://webpages.charter.net/wd4tc/photo.htm What a beautiful transmitter! 73 de Bill, AB6MT [EMAIL PROTECTED] - Original Message - From: John Lawson To: amradio@mailman.qth.net Sent: Sunday, December 24, 2006 9:21 PM Subject: [AMRadio] RCA Transmitter Rescue trip report Hope everyone is enjoying a Holiday according to your own happy definition thereof... Friday morning at 6:30AM I set out in a rental truck from Carson City - drove thru the remnants of a fairly major storm - snow, ice, rain, wind - anyway I arrived mid-afternoon at a fairly remote transmitter site in Northern California and de-installed a nice Bauer 707. Loaded same in the truck, departed for Los Angeles 450 miles to the south. Arrived in ElLay at my hotel just at 12:00 midnight. Saturday morning, 7:30AM - met up with Mike KO6NM, from whom I mooched breakfast at The Famous Denny's. Thence to Mike's QTH, where a great deal of unloading took place. Acting as Santa, Mike had gotten for me a venerable RCA BTA-1MX transmitter, and diverse other oddments, pieces of esoteric audio gear, fiddly bits, crap he didn't want lying around anymore (but was too cheap to throw out) etc., etc., etc. An incredible amount of loading, tying down, breeze-shooting and talk-festing ensued. Thence from "La Casa EnnEmm" out to the far western reaches of Los Angeles civilization, there to load a Collins 20-V2 cabinet for a certain Brad, KB7FQR, here in NoNev. We did so, and lashed it to the truck in a most professional-seeming manner. After making pleasant and cultured parting noises, at around 2 PM I pointed the truck's blunt prow roughly northward and beat feet back for Carson City... some 8 hours in the distance. Arrived at the rural QTH of KB7FQR about 10:30 PM, tied a rope to the 20-V2 cabinet and pulled it off the back of the Vehicle, on-the-fly as it were. Well, no, I lied - we used the lift-gate. I arrived back here at KB6SCO around 11:30 PM. Today, up betimes (a la Pepys) about 8:00 AM, and, fortified with two (2) over-sized cups of fresh-ground French Roast, I essayed to reverse the Loading Process. Brad, KB7FQR, arrived about 11:00 to provide assistance, good humor, moral support, and even derision and ridicule where appropriate. We evacuated the entire truck in short order - and we enlisted the able-bodied assistance of a curious neighbor to help us stand the BTA-1MX back up on it's base in the shack, as it had been loaded in a horizontal aspect, riding on a 4-wheel mover's dolley. After The Unloading, and using the convenient Truck/Lift Gate to take various [big, heavy] items from the now-very-crowded shack out to my storage spaces - I drove it back up the Biggest Little City (Reno) and retrieved my car, and drove back to Carson City, bringing the Great Rescue Trip Saga to a pleasantly-exhausted close. NOW: to install the Iron, install the Active Devices (a bunch of 807s and four 833s) and see how the Old Girl has fared thru her Hibernation. The usual list of tasks must be taken care of to reverse the ravages of time, and pressed-for-time transmitter engineers. The most egregious 'damage' being that Miscreant or Miscreants Unknown have drilled into the lower logo strip and installed a couple of 1/4-20 capscrews into the door assembly GA!! Probably have to have another one made - it's hideous looking. The lovely RCA "Filament Voltage" meter has been replaced with an equally-lovely, but wrong, AC Voltmeter of 0-300. The device apparently took a more-or-less direct lightning hit at some point in it's life, as the RF Power Meter and sender is missing, the plate tank and output circuits all look a lot newer than the rest of the unit, and it looks like someone's been practicing their welding on the top, near where the Transmission LIne exits. And so begins the Journey of Getting the Transmitter on the Air - and specifically 80 Meter AM Fone. My enormous thanks and gratitude to Mike KO6NM, Dan, Doug, Brad, and Scott for all the help these last two days. Now where's that solderin' iron of mine...? Cheers and Best of the Season to All!! John KB6SCO DM09fg __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net
Re: [AMRadio] RCA Transmitter Rescue trip report
Hi John, You might enjoy the following: http://webpages.charter.net/wd4tc/photo.htm What a beautiful transmitter! 73 de Bill, AB6MT [EMAIL PROTECTED] - Original Message - From: John Lawson To: amradio@mailman.qth.net Sent: Sunday, December 24, 2006 9:21 PM Subject: [AMRadio] RCA Transmitter Rescue trip report Hope everyone is enjoying a Holiday according to your own happy definition thereof... Friday morning at 6:30AM I set out in a rental truck from Carson City - drove thru the remnants of a fairly major storm - snow, ice, rain, wind - anyway I arrived mid-afternoon at a fairly remote transmitter site in Northern California and de-installed a nice Bauer 707. Loaded same in the truck, departed for Los Angeles 450 miles to the south. Arrived in ElLay at my hotel just at 12:00 midnight. Saturday morning, 7:30AM - met up with Mike KO6NM, from whom I mooched breakfast at The Famous Denny's. Thence to Mike's QTH, where a great deal of unloading took place. Acting as Santa, Mike had gotten for me a venerable RCA BTA-1MX transmitter, and diverse other oddments, pieces of esoteric audio gear, fiddly bits, crap he didn't want lying around anymore (but was too cheap to throw out) etc., etc., etc. An incredible amount of loading, tying down, breeze-shooting and talk-festing ensued. Thence from "La Casa EnnEmm" out to the far western reaches of Los Angeles civilization, there to load a Collins 20-V2 cabinet for a certain Brad, KB7FQR, here in NoNev. We did so, and lashed it to the truck in a most professional-seeming manner. After making pleasant and cultured parting noises, at around 2 PM I pointed the truck's blunt prow roughly northward and beat feet back for Carson City... some 8 hours in the distance. Arrived at the rural QTH of KB7FQR about 10:30 PM, tied a rope to the 20-V2 cabinet and pulled it off the back of the Vehicle, on-the-fly as it were. Well, no, I lied - we used the lift-gate. I arrived back here at KB6SCO around 11:30 PM. Today, up betimes (a la Pepys) about 8:00 AM, and, fortified with two (2) over-sized cups of fresh-ground French Roast, I essayed to reverse the Loading Process. Brad, KB7FQR, arrived about 11:00 to provide assistance, good humor, moral support, and even derision and ridicule where appropriate. We evacuated the entire truck in short order - and we enlisted the able-bodied assistance of a curious neighbor to help us stand the BTA-1MX back up on it's base in the shack, as it had been loaded in a horizontal aspect, riding on a 4-wheel mover's dolley. After The Unloading, and using the convenient Truck/Lift Gate to take various [big, heavy] items from the now-very-crowded shack out to my storage spaces - I drove it back up the Biggest Little City (Reno) and retrieved my car, and drove back to Carson City, bringing the Great Rescue Trip Saga to a pleasantly-exhausted close. NOW: to install the Iron, install the Active Devices (a bunch of 807s and four 833s) and see how the Old Girl has fared thru her Hibernation. The usual list of tasks must be taken care of to reverse the ravages of time, and pressed-for-time transmitter engineers. The most egregious 'damage' being that Miscreant or Miscreants Unknown have drilled into the lower logo strip and installed a couple of 1/4-20 capscrews into the door assembly GA!! Probably have to have another one made - it's hideous looking. The lovely RCA "Filament Voltage" meter has been replaced with an equally-lovely, but wrong, AC Voltmeter of 0-300. The device apparently took a more-or-less direct lightning hit at some point in it's life, as the RF Power Meter and sender is missing, the plate tank and output circuits all look a lot newer than the rest of the unit, and it looks like someone's been practicing their welding on the top, near where the Transmission LIne exits. And so begins the Journey of Getting the Transmitter on the Air - and specifically 80 Meter AM Fone. My enormous thanks and gratitude to Mike KO6NM, Dan, Doug, Brad, and Scott for all the help these last two days. Now where's that solderin' iron of mine...? Cheers and Best of the Season to All!! John KB6SCO DM09fg __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net
Re: [AMRadio] HV Wire
I don't have personal experience (and don't want any), but have heard horror stories regarding the use of coaxial cable as high voltage wire. Short answer: Don't do it! Use fresh cable designed for the purpose. If you are willing to experiment with a potentially lethal configuration, at least route the wire away from any exposed surfaces. If it does let go at least it won't be through you. 73 de Bill, AB6MT [EMAIL PROTECTED] - Original Message - From: Jack Schmidling To: Discussion of AM Radio in the Amateur Service Sent: Thursday, December 21, 2006 8:39 PM Subject: Re: [AMRadio] HV Wire Jim Candela wrote: > BTW, RG-8 or RG-214 (neither foam) are routinely used in industry for > up to 40 Kv without failure. What is this ref to "foam" all about? If RG-8 is good to 40 kv, one would think RG-58 would be adequate for a few KV, no? And a lot easier to work with. js -- PHOTO OF THE WEEK: http://schmidling.com/pow.htm Astronomy, Beer, Cheese, Fiber,Gems, Sausage,Silver http://schmidling.com __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net
Re: [AMRadio] HV Wire
Neon Sign HV wire also works, if you can obtain same from a neon sign company. 73 de Bill, AB6MT [EMAIL PROTECTED] - Original Message - From: A.R.S. - W5AMI To: Discussion of AM Radio in the Amateur Service Sent: Thursday, December 21, 2006 8:17 AM Subject: Re: [AMRadio] HV Wire On 12/21/06, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > copper or metal core automotive spark plug or ignition wire works for me > also RF parts have high voltage wire in their stock > Dean That's what I use. Got a whole roll of it years back. Got to make sure you get a solid core however, most the new stuff isn't. You can special order it from most auto parts stores like Crow Burlingame, etc., if they don't stock it. __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net
Re: [AMRadio] BT-20A
Cabinet dimensions are 2' 1-1/4" deep, 2' 6-1/4" wide, 6' 3" high. 73 de Bill, AB6MT [EMAIL PROTECTED] - Original Message - From: Rick Brashear To: AMRadio@mailman.qth.net Sent: Tuesday, December 19, 2006 1:14 PM Subject: [AMRadio] BT-20A I have conflicting reports as to the dimensions of the GE BT-20A broadcast transmitter. I have one on the way and I was told at first it was about 31" X 31" X 6', but now the shipper is telling me it's way bigger than that. He claims it is about 41" X 42" X 6'5". Can someone shed a little light on this for me? I may have my hopes all pumped up for nothing sine there is no way I can get the latter in the shack. What do you say, Paul, can you give me an estimate? Steve, anyone? Rick/K5IZ __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net
Re: [AMRadio] No Code Pros and Cons
- Original Message - From: Gary Schafer . For all those that think that the code is a big part of being a knowledgeable ham keep this in mind: In the past in the military electronics schools a person that "washed out" of the electronics classes was sent to be a high speed CW operator. 73 Gary K4FMX That's right.. to learn the basics. 73 de Bill, AB6MT [EMAIL PROTECTED] __ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net
Re: [AMRadio] Going to start parting out an Apache
Good Riddance! Nobody wants crummy 100 watt transmitters on the air anyway. Why don't you just take a sledge hammer to it and quietly put it out of its misery? You must love Hallicrafters, CRAF-T-BOB, why don't you take out a few along with the Heathkit. It'll make the remaining all that more valuable. Maybe you can sell the solder. Fin-d-Cine Bill, AB6MT - Original Message - From: <[EMAIL PROTECTED]> To: "AM Radio" Sent: Wednesday, August 21, 2002 1:00 PM Subject: [AMRadio] Going to start parting out an Apache > Folks, > > I have an unrestored Heathkit TX-1 Apache. > > Going to start removing the transformers and parting it out. No > reasonable takers to date, thinning out the "herd" so to speak. > > I understand many are the same as used in the DX-100. > > Bob - N0DGN Craf-T-Bob (Because I love Hallicrafters!) > R-390A EAC '67, R-390A Collins '52, BC-610I, BC-939B, > and BC-614E > > ___ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio
Re: [AMRadio] Fw: A rumor about ARRL
What are the objectives that lead to this motion? 73 de Bill, AB6MT [EMAIL PROTECTED] - Original Message - From: "WILHITE, JIM" <[EMAIL PROTECTED]> To: "AMRadio" Sent: Thursday, August 15, 2002 7:24 AM Subject: [AMRadio] Fw: A rumor about ARRL I took the time to send a message to one of the directors mentioned in K1ZZ's message and here is his reply. I don't want to alarm people but now is the time to influence the direction of this proposal. I am hopeful the directors will listen to us. I think it gives a little insight into why the subject has arisen. Best we be on our toes. 73 Jim de W5JPW - Original Message - From: Tom Frenaye Sent: Wednesday, August 14, 2002 5:32 PM To: WILHITE, JIM Cc: Walt Stinson Subject: Re: A rumor about ARRL At 06:30 PM 8/14/2002 -0400, you wrote: >Although I am not in your district, I wish to express my feelings that this can be a good thing or a bad thing depending on its proposal. I agree!! Quite a number of things have to be worked out before we go forward to the FCC. Any action won't be for many months (at least)! >The rumor has stated that the maximum bandwidth be limited to 3.5 KHz. If this rumor is true, I want you to know I am deeply opposed and will file comments with the FCC as will many other members of the ARRL who are involved with AM operation. > >Can you substantiate this rumor please? Nope, can't substantiate it... Setting specific limits on maximum bandwidth was not discussed at the Board meeting as far as I recall. Just a rumor, something the Internet and some users like to start! But, now that the issue has been raised, are there limits to the bandwidth of different emission types that ought to be in our goals? The FCC often speaks to "good engineering practice" and I believe they would not like to hear a 5 khz wide SSB or RTTY signal, for example. -- Tom --- StripMime Report -- processed MIME parts --- multipart/alternative text/plain (text body -- kept) text/html The reason this message is shown is because the post was in HTML or had an attachment. Attachments are not allowed. Please post in Plain-Text only.--- ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio
Re: [AMRadio] A rumor about limiting bandwidth
We have a substantial hobby in exploration, restoration and use of vintage analog equipment and, IHMO, there isn't any reasonable excuse for arbitrarily terminating this interest. I don't know what has been discussed on other reflectors, but giving the ARRL the benefit of the doubt, there are issues that may not have anything to do with AM per-se. For example, there is likely pressure building to provide relaxed amateur licensing to accommodate the communications needs for a Homeland Security program. Separately, the present split of voice/CW may not be optimum on 80 meters, and requests, for example, have been made by some AM'ers to provide for unfettered space. Or, a bandwidth regulation change might be related to addressing the international stipulation that skill in CW remain a license requirement. One can speculate that early experiments in digital transmission might initially use a wide bandwidth; with subsequent development directed toward a reduction in bandwidth requirement, but regulation shouldn't hamper this opportunity. Perhaps the ARRL is thinking of a bandplan with several bandwidth allocations. One could be very narrow to accommodate CW and narrowband digital modes, another could be set for SSB, and/or shared for wide open experimentation in digital transmission and AM. Though not at the state of the art, PWM is one of very few voice digital modes with any "in the field" development interest on the part of amateurs. 73 de Bill, AB6MT [EMAIL PROTECTED] - Original Message - From: "WILHITE, JIM" <[EMAIL PROTECTED]> To: "AMRadio" Sent: Wednesday, August 14, 2002 3:01 PM Subject: [AMRadio] A rumor about limiting bandwidth Recently on another reflector I read a rumor about the ARRL proposing a maximum bandwidth limitation on subbands of 3.5 Kcy. I sent the following message to the Executive Director of the ARRL and here is his answer. I post for you consumption. Is it time to get involved with the directors? 73 Jim de W5JPW -Original Message- From: WILHITE, JIM [mailto:[EMAIL PROTECTED] Sent: Wednesday, August 14, 2002 1:34 PM To: [EMAIL PROTECTED] Subject: Rumors Hi Dave: Another rumor has surfaced about the ARRL being supportive of limiting the bandwidth of signals. The rumor is 3.5 kHz for wideband signals. If this is true, I want you to know how adamantly I am opposed to the proposal. In a time when frequency allocations are increasing and band usage is much more congenial, I find it hard to believe that anyone would support this kind of proposal. The rumor is that the ARRL is prepared to sumit a notice of proposed rulemaking concerning this issue. Can you please tell me if that is the case and is the notice being prepared? Tnx and 73 Jim Wilhite member # 0008432524 de W5JPW Well, Jim, all I can tell you is that the ARRL opposed a 3.5-kHz bandwidth limitation the last time it was proposed, by the FCC in 1976 (Docket 20777), and I don't know anything that's changed in the meantime to alter that position. Probably what set this off was Minute 64 of the July 2002 Board Meeting which reads in its entirety: 64. On motion of Mr. Frenaye, seconded by Mr. Stinson, it was VOTED that at the next practical opportunity the ARRL shall petition the FCC to revise Part 97 to regulate subbands by signal bandwidth instead of by mode. The Board has given us no instruction as to what the petition should propose with regard to bandwidth. Absent instructions to the contrary, what we draft (nothing's been done on this as of now) will not propose new restrictions. But it's certainly true that in going from a regulatory regime based on mode of emission to one based on bandwidth there are bound to be consequences, intended and otherwise, that will have to be considered very carefully. 73, David Sumner, K1ZZ --- StripMime Report -- processed MIME parts --- multipart/alternative text/plain (text body -- kept) text/html The reason this message is shown is because the post was in HTML or had an attachment. Attachments are not allowed. Please post in Plain-Text only.--- ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio
Re: [AMRadio] Trade nos Stancor A-3894 poly-pedance 125 watt modulation xfmr
Hi, Bob I have a 6000 volt ct transformer, with a 120v tapped hi/lo primary. Should be good for at least an amp. Weighs 53 pounds. I can send a pix if you are interested. Not looking for a trade, though, am trying to lighten the load around here. I'd take $75 plus shipping. 73 de Bill, AB6MT [EMAIL PROTECTED] - Original Message - From: "Bob Login" <[EMAIL PROTECTED]> To: Sent: Friday, August 09, 2002 2:40 PM Subject: [AMRadio] Trade nos Stancor A-3894 poly-pedance 125 watt modulation xfmr > Hi, Possibly someone out there needs this new in the box modulation xfmr? > It will match from 2000-20,000 ohms in both primary and secondary with max > audio power at > 125 watts ... 225Ma on both primary & secondary. Never used in original box. > > I built a new rig pair of 4-400a's modulated by triode connected 813's. The > plate power xfmr a very old > Thordason 6000vct shorted out. I'm looking for a replacement that will be > able to go 3000-3500 at 500Ma. > So a 1500v at 1 amp in a doubler would work as will 2500-3000v at 500Ma or > 6000vct at 500Ma.what do you have? > Used ok > 73 Bob, AA8A > > ___ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio
Re: [AMRadio] UTC S-21 specification
"UTC Special Series transformers are specifically designed for amateur and popular-priced PA service. These units are finished in a rich, commercial type medum gray enamel. A recessed terminal strip is provided, permitting above chassis or breadboard wiring in addition to standard chassis type." S-21 Universal Modulation, Any Class B primary, Any Class C secondary, 110 watts G7 Case, sold for $21 in 1963. (From Elmar/Masters Catalog) Must say, the input and output impedance rating appears rather strange. No turns radios or impedance specified, nor current ratings. G7 Case: 4-5/8 x 4-5/8 x 5-1/2" 8 lbs. Perhaps someone else has better detail. 73 de Bill, AB6MT [EMAIL PROTECTED] - Original Message - From: "Mark Foltarz" <[EMAIL PROTECTED]> To: Sent: Thursday, July 25, 2002 6:58 PM Subject: [AMRadio] UTC S-21 specification > Hello Group, > > Does any one happen to have the specs for a UTC S-21 ? > > TNX > DE KA4JVY > Mark > > __ > Do You Yahoo!? > Yahoo! Health - Feel better, live better > http://health.yahoo.com > ___ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio
Re: [AMRadio] Audio response and Long distant QSO's (was: Suggestions Please)
The simple answer is because Amateur Radio is a hobby and because some stations want to sound very good, and the operators work very hard on their station and they do sound very good. PWM has great promise, but why does this design or use of big iron have any factor in this discussion? Why don't you ask the operator about his signal, or if that is too bothersome, why not adjust your receiver so that it will ignore that part of the audio spectrum? - Original Message - From: "Jeff Edmonson" <[EMAIL PROTECTED]> > > Charlie, (and Bill and others) the whole point is, why are some hams trying > to sound better than most broadcast stations? > > If you listen to most broadcast stations, there's some distortion there that > you'd hope you'd never see on your Ham station, but those stations are > TRYING to pass frequencies lower than 50hZ - in fact, they're trying to > pass as low as 30hZ and that requires some BIG iron, UNLESS you're > using PWM/PDM. > > Methinks most mic equalizers could use some tweaking, and some rolling > off of the bass. > > 73 = Best Regards, > -=Jeff/W5OMR=- > > ___ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio
Re: [AMRadio] Audio response and Long distant QSO's (was: Suggestions Please)
Hi, Jeff You bring up an interesting point. First of all, I am still attempting to understand why it is absolutely necessary to provide substantial pre-emphasis to AM audio above the broadcast band (usually a 7-12DB peak at 2.5 kHz). A microphone, transmitter and receiver, all when used together will sound beautiful on the commercial AM band will sound muddy and muffled if the same equipment is operated at 160 meters. Signal-to-noise might be a factor, unless the signal is local and fully quieting, and even then pre-emphasis appears to be necessary. Commercial shortwave stations pre-emphasize their signals. The popularity of the D-104 which has this very pre-emphasis built-in, are popular even on the CB band. When I purchased my Kenwood TS-440 (well before interest in AM), my first wish was to optimize the set for weak-signal operation and I set about to find a 1.8 or 2 KHz filter to fill in the unused M1 Selectivity switch position. Much to my surprise and disbelief, I was introduced to the notion that a filter of this bandwidth would be next to useless for long distance audio recovery because it would chop off so much of the audio bandpass that very little audio information would be available for noggin processing. This has indeed turned out to be the case, and in fact instead of filling in the unused selectivity position with a narrower filter, I actually obtained a wider filter, think 2.8 KHz (one supplied with the Kenwood TS-830) and literally widened the receiver. The result has been excellent as the same filter is used for transmit and audio reports have been very complimentary. I almost never use the original 2.3 filter that was supplied with the receiver and only in special circumstances have I found it any more effective than the wider filter. It is usually worse. Further, I have listened to AM signals from across the country, and usually not with the TS-440. I will agree a few have been so bassy that they can be difficult to understand, but overall signals with "50 to 5KHz" modulation are overall so much easier to hear through noise that one wonders where the notion of "communications quality" came from. There are some signals that are so well processed (and frequency limited), and where the noise just happens to be strong in a different part of the audio spectrum, or the voice characteristic of the operator happens to overcome noise that such weak signals cut through. Overall, in my experience, a full-fidelity signal will be heard in most cases where a "communications quality" signal is torn up by noise and fading. This goes for the receiver as well. The SX-62 is very wide, and the audio capture from an am signal is obvious when compared with the TS-440. I don't dislike the '440 at all, and use it all the time, but have observed that even the wider positions of the Collins R-390 will allow better understanding of a voice buried in noise. Maybe it is just my noggin, but Mike Dorrough, K06NM would talk here about "power bandwidth," and Rich Measures, AG6K would talk about "information bandwidth." Another interesting experiment is to adjust the variable bandwidth control of a SB-200/BC-779 series Hammerlund receiver and listen as the received signal jumps out of the noise when the bandwidth control has been adjusted to an optimum. The adjustment varies greatly with every station, which indicates to me that the signal to noise ratio varies with more than simple amplitude with every station. No doubt received noise rarely has a flat power bandwidth across the audio spectrum. In short, audio needs to be pre-emphasized on short wave (don't know why), and the transmitter and receiver should be matched to the same information bandwidth. Then, within reason, the more information transmitted means more information is available to the receiver and can offer an advantage to sustain a communications path. In my experience, presence of lows has made the difference of whether or not a station can be understood. Of course if communications is the first priority in a weak signal environment, then use of the SSB mode offers a tremendous advantage. Use of AM involves other factors such as audio quality, ease of receiver tuning, application of and restoration of vintage equipment, and use of homebrew equipment, all of which go way beyond simply establishing a radio contact. Often on-air correspondence differs in character from SSB contacts, both in duration and depth of information. I just slipped on the soap. 73 de Bill, AB6MT [EMAIL PROTECTED] - Original Message - From: "Jeff Edmonson" <[EMAIL PROTECTED]> To: Sent: Wednesday, July 24, 2002 4:24 PM Subject: [AMRadio] Audio response and Long distant QSO's (was: Suggestions Please) > > > : If you have to ask, then you are probably using too much. If you are > : listening, you probably aren't using enough. If all you think about is > : comparing AM to SSB, then you are just looking for a silly argument. > > Trust me, Bill, t
Re: [AMRadio] Suggestions Please
If you have to ask, then you are probably using too much. If you are listening, you probably aren't using enough. If all you think about is comparing AM to SSB, then you are just looking for a silly argument. 73 de Bill, AB6MT [EMAIL PROTECTED] - Original Message - From: "Jeff Edmonson" <[EMAIL PROTECTED]> To: Sent: Wednesday, July 24, 2002 3:34 PM Subject: Re: [AMRadio] Suggestions Please > : Thanks for the info, John. > : > : I'll look through some of my old handbooks for ideas. I suspect you're > : right: hi fi wasn't what they had in mind for that rig! > > Why should our AM transmitters of today be considered "hi-fi"? > I mean, audio is nice and all, and we're getting a helluva lot more > than what can be heard on SSB and if we're only using from 200 > to 3.5kHz, we're using plenty more audio spectrum than our SSB > counterparts. > > but, running a rig, with an audio response of 50hZ to 5kHz? Where > does the "excessive" line stop? > > 73 = Best Regards, > -=Jeff/W5OMR=- > > ___ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio
Re: [AMRadio] Thordarson 6699/Heaven help the neighbors
Speaking of transformers, I have a 6KV CT 1A, 120 Volt hi/lo tapped primary, 52lb coaster for a 250 watt rig. 73 de Bill, AB6MT [EMAIL PROTECTED] - Original Message - From: "Jeff Edmonson" <[EMAIL PROTECTED]> To: Sent: Tuesday, July 23, 2002 10:31 PM Subject: Re: [AMRadio] Thordarson 6699/Heaven help the neighbors > While folks is looking for transformers, I could use a 5 volt > transformer for a pair of 872's. What are they, 7.5amps > each? 15amps total needed. > > 73 = Best Regards, > -=Jeff/W5OMR=- > > Subject: Re: [AMRadio] Thordarson 6699/Heaven help the neighbors > > > : ok John - I'll look, once in a while one gets lucky. Good luck and thanks > : again., Scott > > > ___ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio
Re: [AMRadio] Suggestions Please
They are supposed to work quite well, and are deceptively small. Probably torroidal. Have some also, but no plans at present. 73 de Bill, AB6MT [EMAIL PROTECTED] - Original Message - From: <[EMAIL PROTECTED]> To: Sent: Wednesday, July 24, 2002 12:57 PM Subject: Re: [AMRadio] Suggestions Please > > Hello all, > > Related to this thread -- I have several ART-13 mod. transformers: P-P 811s > to 813 final. They don't look like they have a lot of core cross section. > Still, it might be fun to build something up using one. Has anyone had > good results with this mod iron? I don't expect a high powered rig; just > somehting different from my DX-100 or Viking II. I thought I'd build up > the modulator, get that working, then move onto an RF deck. > > Any thoughts? > > Thanks and 73, > > Ed N3CMI > > > ___ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio
Re: [AMRadio] Antenna question... simple but I've never used a very long wire...
Long Wire: (1) Don't make it too long (4-5 wavelegnths on the lowest desired frequency). (2) Include a Good Ground (whoops, more blisters on ur fingers, sorry 'bout that). (3) Y'ull need a good tuner. Did you see the recent article in QST? MFJ? Naw, except for their big'n and you only use 100w. (4) Keep it high (5) Depending on what you are wishing to use it for, you might be better off with a resonant antenna. (6) Loops have a lil gain, work great. (7) Don' end-feed it, put a littl on the en (see 'Antennas for All Locations' by Moxin) an weed it wid twn weedr. (8) aW, Shucks, put up a loop, or a Curtin, or sumptun like tat, an 'ul be rely hapy. 73 de Bill, AB6MT [EMAIL PROTECTED] - Original Message - From: "I've got blisters on my fingers!" <[EMAIL PROTECTED]> To: Sent: Tuesday, July 09, 2002 5:55 PM Subject: [AMRadio] Antenna question... simple but I've never used a very long wire... > Hi all... > > I want to set up a long wire antenna for standby purposes... > > I am considering a 500 foot end fed type... > > What I need to know (I've read the handbook but...) is 'real' information > that deals with the loading of one of these on 75m and the practical tuner > that could be used... > > 'practical' information welcome hi hi... > > 73 > Vince > ka1iic > > > ___ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio
