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Total 1055 documents matching your query.

181. Re: [TenTec] Centurion Amplifier - 110 volt? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 25 Sep 2006 23:13:54 -0500
A ground rod is acceptable at the secondary panel. It is not acceptable as a substitute for the ground wire carried from the main panel and kept isolated from the neutral in the secondary panel. A th
/archives//html/TenTec/2006-09/msg00592.html (14,486 bytes)

182. Re: [TenTec] Titan 425 Reflected Power (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 25 Sep 2006 23:26:19 -0500
The directional coupler in the Titan is out of calibration or is not capable of proper calibration because it has too poor a directivity. So that it shows a match for a mismatched load. You should NO
/archives//html/TenTec/2006-09/msg00593.html (11,650 bytes)

183. Re: [TenTec] Centurion Amplifier - 110 volt? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 26 Sep 2006 10:01:39 -0500
But its not under carpet. Unless the tower owner is under something that falls. There are some records showing a few are hurt and killed. -- 73, Jerry, K0CQ, All content copyright Dr. Gerald N. Johns
/archives//html/TenTec/2006-09/msg00603.html (9,664 bytes)

184. Re: [TenTec] Centurion Amplifier - 110 volt? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 26 Sep 2006 13:11:37 -0500
Its not necessary to run the most direct yet hidden path to meet the code. It would be perfectly legitimate to run conduit on the surface of the finished ceiling and walls to minimize finish rework.
/archives//html/TenTec/2006-09/msg00611.html (10,844 bytes)

185. Re: [TenTec] Centurion Amplifier - 110 volt? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 26 Sep 2006 13:13:31 -0500
Higher voltage demands better insulation but otherwise the rules are the same unless the output of the power supply is power limited to a few watts, which is not the case for a KW amplifier. -- 73, J
/archives//html/TenTec/2006-09/msg00612.html (9,363 bytes)

186. Re: [TenTec] Centurion Amplifier - 110 volt? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 27 Sep 2006 10:51:40 -0500
Last I noticed, the NEC rules for RADIO STATIONS didn't limit themselves to amateur only, but specified antenna and feed line conductor sizes mostly. Which the antenna handbooks mention but ignore. T
/archives//html/TenTec/2006-09/msg00628.html (10,703 bytes)

187. Re: [TenTec] Centurion Amplifier - 110 volt? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 27 Sep 2006 12:12:03 -0500
Getting 13.8 volts over a 50' path at enough current to run a solid state KW PA would be tough. To keep the voltage drop to 0.2 volts at 100 amps would take a wire resistance under 0.002 ohms. For 10
/archives//html/TenTec/2006-09/msg00631.html (10,939 bytes)

188. Re: [TenTec] Omni VI+ Keying Question (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 01 Oct 2006 17:30:55 -0600
My guess is that thee PA keying relay has been quieted with a match stick holding it closed. Remove the match stick. -- 73, Jerry, K0CQ, All content copyright Dr. Gerald N. Johnson, electrical engine
/archives//html/TenTec/2006-10/msg00025.html (8,395 bytes)

189. Re: [TenTec] #218 filter (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 03 Oct 2006 12:09:14 -0600
Another technique that works is to use spectrum analyzer software on a PC with sound card and let it display the noise spectrum of the received audio with the noise of a dead band at the receiver ant
/archives//html/TenTec/2006-10/msg00076.html (9,587 bytes)

190. Re: [TenTec] Centurion Amp Woes (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 08 Oct 2006 11:15:28 -0600
There was a previous amplifier sold as a Heathkit and a commercial maker. It had a similar failure mode, wreck the middle of the high voltage winding or the plate transformer while sitting at idle. T
/archives//html/TenTec/2006-10/msg00193.html (10,895 bytes)

191. Re: [TenTec] Centurion Amp Woes (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 08 Oct 2006 16:18:11 -0600
Sometimes tube filaments are supplied with current limited transformers to reduce the inrush. Lamp inrush current can be 16 times operating current, that's why a thin filament seems to nearly always
/archives//html/TenTec/2006-10/msg00202.html (12,301 bytes)

192. Re: [TenTec] Centurion Amp Woes (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 08 Oct 2006 16:36:00 -0600
That resistor also helps limit inrush current. Measuring 5 volts AC accurately to a couple percent is not a trivial problem, many multimeters have poor AC accuracy that gets worse at low voltages. To
/archives//html/TenTec/2006-10/msg00203.html (10,872 bytes)

193. Re: [TenTec] Questions on Corsair II (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 08 Oct 2006 19:36:29 -0600
It took me three hours. The parts in mine were worn so the rebuild kit was a necessity. Work over a tray with turned up edges (like a cafeteria tray) and no gaps, else you will be in need of small st
/archives//html/TenTec/2006-10/msg00220.html (9,614 bytes)

194. Re: [TenTec] Centurion Amp Woes (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 08 Oct 2006 19:50:27 -0600
The thoriated tungsten filament isn't all that much different from the filament in a light bulb except it doesn't get run quite as hot and has thorium mixed in with the tungsten before the filament i
/archives//html/TenTec/2006-10/msg00221.html (14,617 bytes)

195. Re: [TenTec] Questions on Corsair II (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 08 Oct 2006 21:08:15 -0600
The plot thickens! 73, Jerry, K0CQ _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/tentec
/archives//html/TenTec/2006-10/msg00236.html (8,060 bytes)

196. Re: [TenTec] Questions on Corsair II (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 09 Oct 2006 20:55:40 -0600
If its a PTO problem it comes from either lubrication or a wear problem. With age the grease gets lumpy. The slug is spring loaded and that tends to move the screw around the lumps. And it also makes
/archives//html/TenTec/2006-10/msg00276.html (10,273 bytes)

197. Re: [TenTec] Argonaut V and an amplifier (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 10 Oct 2006 17:17:43 -0600
The rules I downloaded in August still require 50 watts drive. And some were pure class C planning on the AM carrier for any bias towards linearity. Most were severe splatter and harmonic creators. W
/archives//html/TenTec/2006-10/msg00297.html (10,229 bytes)

198. Re: [TenTec] Argonaut V and an amplifier (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 10 Oct 2006 17:25:31 -0600
I think you might find better efficiency if the amplifier was tuned with normal drive levels and those tuning capacitor positions were used for the low drive condition. At least for the loading. As f
/archives//html/TenTec/2006-10/msg00298.html (11,923 bytes)

199. Re: [TenTec] Argonaut V and an amplifier (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 11 Oct 2006 10:37:18 -0600
News to me. Maybe Breune, Pappenfous and Shoenike got it all wrong in their tome on SSB 45 years ago.... Generally one does never change the bias in the PA (though we did modulate the grid bias in th
/archives//html/TenTec/2006-10/msg00318.html (10,741 bytes)

200. Re: [TenTec] o i PROBLEM (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Thu, 12 Oct 2006 10:20:36 -0600
One way in most radios of achieving that breadth of signal is to have the noise blanker on way too strong so it chops holes in all signals and splatters them all over. Perhaps the analogue AGC has fa
/archives//html/TenTec/2006-10/msg00340.html (9,003 bytes)

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