Re: [AMRadio] 220 volt AC Power Question
This does not meet the code. A ground wire can never be used to carry load. Also, your ground wire is probably bare. A neutral conductor must be insulated. Darrell, WA5VGO At 07:09 PM 10/30/2006 -0600, you wrote: Hi all, I am building an amplifier that has a combination of 220 volt and 120 volt transformers. The HV plate supply is 220V, and the rest is 120V. I will be keying the plate supply. My 220V outlet has phase, phase, and ground. There is NO neutral. The outlet is not a GFCI outlet so ground current will work, BUT. The BUT here is whether this is legal with the National Electric Code? Before you say NO, consider the electric clothes dryer. These all run off 220V, and have 3 prong power cords. I have heard that in some dryers there are 120 volt loads (lights, and timer) as well as 220V (heater and motor). If this is true, then my approach must be OK so long as my power switch uses a DPST switch and (double fuses)to insure everything is off when it is in the OFF position. Comments please... BTW, I do have a 240/120 autotransformer of suitable size (VA rating), but space does not permit it's use. Jim JKO -- No virus found in this outgoing message. Checked by AVG Free Edition. __ 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] Phone band expansion
How do you find time for ham radio? I figure a guy of your caliber would be
too busy with more important things. Like solving world hunger or finding a
cure for cancer.
At 09:23 PM 10/13/2006 -0400, you wrote:
Anytime sport
- Original Message - From: "Darrell, WA5VGO" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio in the Amateur Service"
Sent: Friday, October 13, 2006 9:19 PM
Subject: Re: [AMRadio] Phone band expansion
Your a great guy, Bob. It's good to know I can go to you for ALL the answers.
Darrell, WA5VGO
At 07:35 PM 10/13/2006 -0400, you wrote:
Plus, if he had half a brain, he would have upgraded to an Extra back in
the late 60's, early 70's. It's sour grapes. I agree that a pre
no-code Extra is more valuable than post no code but he missed the
boat. My feeling is that my 20WPM Extra will always be worth more(to me
at least) than a no code Extra. I've always felt that no code extras
should sign /nc when in the Extra part of the bands.
Bob W6TR
- Original Message - From: "Donald Sanders" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio in the Amateur Service"
Sent: Friday, October 13, 2006 6:56 PM
Subject: Re: [AMRadio] Phone band expansion
Because with your 1968 Advanced you cannot go to the Extra Only
Frequencies.
Healthfully yours,
Don W4BWS
- Original Message - From: "Darrell, WA5VGO" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio in the Amateur Service"
Sent: Friday, October 13, 2006 5:27 PM
Subject: Re: [AMRadio] Phone band expansion
> On that subject, I can't
>>understand why the Advanced hams don't go down and pass the Extra
written
>>exam, especially since the code requirements have been
eliminated. >>My,
>>it's so easy to get on radio these days.
>>
>>Bob W6TR
Why would I want to downgrade from my 1968 advanced to the new extra?
Darrell, WA5VGO
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Re: [AMRadio] Phone band expansion
Your a great guy, Bob. It's good to know I can go to you for ALL the answers. Darrell, WA5VGO At 07:35 PM 10/13/2006 -0400, you wrote: Plus, if he had half a brain, he would have upgraded to an Extra back in the late 60's, early 70's. It's sour grapes. I agree that a pre no-code Extra is more valuable than post no code but he missed the boat. My feeling is that my 20WPM Extra will always be worth more(to me at least) than a no code Extra. I've always felt that no code extras should sign /nc when in the Extra part of the bands. Bob W6TR - Original Message - From: "Donald Sanders" <[EMAIL PROTECTED]> To: "Discussion of AM Radio in the Amateur Service" Sent: Friday, October 13, 2006 6:56 PM Subject: Re: [AMRadio] Phone band expansion Because with your 1968 Advanced you cannot go to the Extra Only Frequencies. Healthfully yours, Don W4BWS - Original Message - From: "Darrell, WA5VGO" <[EMAIL PROTECTED]> To: "Discussion of AM Radio in the Amateur Service" Sent: Friday, October 13, 2006 5:27 PM Subject: Re: [AMRadio] Phone band expansion > On that subject, I can't >>understand why the Advanced hams don't go down and pass the Extra written >>exam, especially since the code requirements have been eliminated. My, >>it's so easy to get on radio these days. >> >>Bob W6TR Why would I want to downgrade from my 1968 advanced to the new extra? Darrell, WA5VGO __ 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 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] Phone band expansion
On that subject, I can't understand why the Advanced hams don't go down and pass the Extra written exam, especially since the code requirements have been eliminated. My, it's so easy to get on radio these days. Bob W6TR Why would I want to downgrade from my 1968 advanced to the new extra? Darrell, WA5VGO __ 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] AM on 3970?
No doubt you are hearing myself and Ronnie, K5WLT. We meet most Sundays on 3970 to avoid all of the congestion in the AM window. We both run 807 rigs with about 35 watts of carrier. 73, Darrell, WA5VGO At 09:29 AM 10/1/2006 -0500, you wrote: It's about 9:20 AM central time on Sunday morning as I write this. I'm normally not around the rig at this time. However, twice on Sundays when I have been here, I have found an AM qso on 3970. The signals are too weak into my Mississippi qth for me to pick out specific calls in order to determine where this activity is coming from. If you are part of that group, please know that you are at least being detected by someone whose ears perk up whenever an AM signal is located. Mike Duke, K5XU American Council of Blind Radio Amateurs __ 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] Xfmr
Can someone tell me what an "A 2920" transformer is or who manufactured it? It is supposed to be an audio (inner stage) transformer in a modulator. It shouldn't be critical. In almost any case, a 1:2 or 1:3 will work perfectly. Just make sure that the current rating on the primary winding is adequate. Are you sure it's an interstage transformer and not a driver transformer? 73, Darrell, WA5VGO __ 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] Modulator design needed
The Apache does use a driver transformer. A triode connected 12BY7 is transformer coupled to the grids of the EL34's. For AB1 operation, look at any of the hi-fi type tubes (EL34, KT88, 6550, 8417, etc). Most will deliver plenty of power without grid current. Another good choice is the 6146. 807's don't do very well in AB1. They just can't deliver the power of many other tubes. 73, Darrell, WA5VGO
Re: [AMRadio] Rubber Feet
Lots of good suggestions for finding a source for rubber feet. John Lawson was certainly right about McMaster Carr. They have a good selection, and the prices are reasonable. Thanks for all the suggestions. 73, Darrell, WA5VGO
[AMRadio] Rubber Feet
What company has a good selection of rubber feet with screw mounting? All of the usual suppliers seem to have a very limited selection of mostly tiny self adhesive ones. 73, Darrell, WA5VGO
Re: [AMRadio] R-388 PTO info needed
I had the same problem several years ago. I found an open resistor in the PTO. Check the voltages on the two PTO tubes. You'll find the problem. 73, Darrell, WA5VGO At 04:47 PM 12/25/2005 -0500, you wrote: Further to my Xmas Eve Scrooge Radio Post - I have discovered that no signals of any kind appear on the PTO output cable when isolated from the mixer tube, and injecting the correct frequency into that pin of the mixer (from my bench oscillator) restores the radio to operation. So, of course, the PTO has quit, and the tubes (AFAIK) are good - but next I'll replace them with a couple that test out at better than 70% Gm - somehow I think that's not going to be the Problem. If anyone within the sound of my keyboard has any experience actually repairing this series of PTO - it's a Collins 70E-15 ser. M1751 - I'm trying to guage whether I should spend the time to dredge it out and fix it - or (since the front panel needs to be refinished) I would be better served by just bundling it off to someone and letting an expert refurb the radio. I do plan to keep it, it's my Fave Reciever - for Ham and SWL - Also: if you have a quote to perform the above, lemme know ASAP - I'm 'motivated' as they say in Real Estate. Cheers and Best of the Season! John KB6SCO __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb
RE: [AMRadio] Pi-Net vs Link Couple
Triodes are great for grounded grid, but for class C, why fight neutralization? Use a power grid tube. Sure you need a screen supply, but consider the paybacks. No neutralization; at least on the lower frequencies, and low drive requirements. I realize modulating it is a little trickier, but I've never had the Eimac system of placing a reactor in the screen supply to fail to do the trick. Darrell, WA5VGO
Re: [AMRadio] Power Resistor
It probably won't be cheap, but this guy probably has any resistor you need. http://minresistors.com/ 73, Darrell, WA5VGO
Re: [AMRadio] AM Amps
Got to be CW, RTTY, etc. With AM you would either melt the tube down or splatter all over the band. 73, Darrell, WA5VGO At 04:49 PM 1/13/2005 -0500, you wrote: How do you reduce the drive for AM? I take it that is how you operate CW? 73 Gary K4FMX James M. Walker wrote: Hum, 4-1000A G.G. amplifier, 3000 VDC plate, 700 MA Plate I, 500 MA Grid I, with 125 Watts out of DX-100 running apprx 2100 W input and dissipating 670 watts plate = approximately 1430 watts output! While the carrier level into 50 ohm dummy load is 1400 watts measured and a really NICE orange glow! This is with a 200 cfm blower, air system socket and chimney. Jim WB2FCN
RE: [AMRadio] AM Amps
Jim, If anyone believes that they don't need a good earth ground on their equipment, I'd be glad to set them straight. Darrell, WA5VGO At 06:07 PM 1/12/2005 -0600, you wrote: Darrell, That amp you built with the 4-1000 was a "killer" in more ways than one! Time for a confession.. Regards, Jim WD5JKO -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Darrell, WA5VGO Sent: Tuesday, January 11, 2005 6:04 PM To: Discussion of AM Radio Subject: Re: [AMRadio] AM Amps At 04:21 PM 1/11/2005 -0500, you wrote: >In a message dated 1/11/05 12:14:43 PM, [EMAIL PROTECTED] writes: > > > > well all I can say is it works.. works well as a matter of fact, and has > > been for 6 years :) > > I typically run between 350 and 400 watts of carrier every day. It looks > > great on the scope. Modulation envelope is perfect. 100% modulation. In 6 > > years Ive only lost one tube, and I accidently broke that one. > > > > > >I have to agree with Gary. You're seeing 1600 watts PEP and 400W of carrier >OUT with a pair of GG 813s??? Does not compute! Just curious, are you >talking about 400W INPUT power to the linear under carrier only condx >maybe? If >so, this would work out to about 133W carrier OUT and each 813 dissipating >about 133W which would make more sense. > >Dennis D. W7QHO >Glendale, CA I'm with Dennis and Gary. To run a linear amplifier at 375 watts of carrier and 100% modulation, you will need around 800 watts of plate dissipation. For a short time a number of years ago, I tried running an AF-68 and a 4-1000A linear amplifier. I could never get more than around 450 watts of carrier and stay linearI didn't need a heater in the shack either. 73, Darrell, WA5VGO 73, Darrell, WA5VGO __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net -- No virus found in this incoming message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 265.6.10 - Release Date: 1/10/2005 -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 265.6.11 - Release Date: 1/12/2005 __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net
Re: [AMRadio] AM Amps
At 04:21 PM 1/11/2005 -0500, you wrote: In a message dated 1/11/05 12:14:43 PM, [EMAIL PROTECTED] writes: > well all I can say is it works.. works well as a matter of fact, and has > been for 6 years :) > I typically run between 350 and 400 watts of carrier every day. It looks > great on the scope. Modulation envelope is perfect. 100% modulation. In 6 > years Ive only lost one tube, and I accidently broke that one. > > I have to agree with Gary. You're seeing 1600 watts PEP and 400W of carrier OUT with a pair of GG 813s??? Does not compute! Just curious, are you talking about 400W INPUT power to the linear under carrier only condx maybe? If so, this would work out to about 133W carrier OUT and each 813 dissipating about 133W which would make more sense. Dennis D. W7QHO Glendale, CA I'm with Dennis and Gary. To run a linear amplifier at 375 watts of carrier and 100% modulation, you will need around 800 watts of plate dissipation. For a short time a number of years ago, I tried running an AF-68 and a 4-1000A linear amplifier. I could never get more than around 450 watts of carrier and stay linearI didn't need a heater in the shack either. 73, Darrell, WA5VGO 73, Darrell, WA5VGO
Re: [AMRadio] Pix of BPL hardware on utility poles in Cincinnati
That's odd, I thought the Chairman and three of the five commissioners were appointed by Bush. 73, Darrell, WA5VGO At 03:20 PM 7/23/2004 +, you wrote: Excellent!!! It must be realized that the people withing the commission that are pushing BPL are in-fact Clinton 'hang-ons'... Bush didn't 'clean house' like he should have... Go to my domain for links on how loved kerry is... http://vincewerber.org/ Have a good day and a better tomorrow 73 vince ka1iic
Re: [AMRadio] 6 Meter AM Rig.. Gonset G76?
Jim, You got me curious. I had never tried my G-76 on 6 meters. I fired up the transmitter and could only get about 12 watts output. This was with about 90 watts input. I didn't go any farther. At least with my G-76, I've got to concur with you. The 6DQ5 was very "distressed". 73, Darrell, WA5VGO At 10:00 AM 6/8/2003 -0700, Jim candela wrote: My question to the group is "is the G76 a viable six meter rig?" I recall a very distressed 6DQ5...
[AMRadio] AM Bulletin Board
Well, some wise guy has foul up the AM Bulletin board. All I did was go to the bulletin board and now every time I open it, a porno site also opens up. It is getting past my fire wall. Does anyone know how to get rid of the problem? Thanks, Darrell, WA5VGO
Re: [AMRadio] re: Ranger driving Thunderbolt
This sounds like a good plan. Simply reducing the loading on the 6146 will probably cause excessive screen grid dissipation. Darrell, WA5VGO At 05:19 PM 4/7/2003 -0400, you wrote: The way I reduce power out on my Ranger to drive an amp is not exactly the right way, but it works very well. I know of several other people using the very same method, reduce the screen voltage. I reduce my normal screen voltage with a variable resistor controlling a transistor. Turn the screen voltage up and load the Ranger as normal and then adjust the screen voltage until the desired power out is obtained. Power out is adjustable from full power down to 5 watts or so, I normally run my Ranger at 10 watts to drive an amp. The Ranger is capable of a lot of positive modulation peaks running like this. I have observed no ill affects from doing this, your mileage may vary. Mike / WN3B
