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241. Re: [TenTec] (no subject) (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 28 May 2010 19:15:57 -0500
WE members of the list can't do that but if you click on the bottom link it will tell YOU how YOU can leave. 73, Jerry, K0CQ _______________________________________________ TenTec mailing list TenTec
/archives//html/TenTec/2010-05/msg00478.html (7,861 bytes)

242. Re: [TenTec] Extra class CW Sending Test (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sat, 29 May 2010 15:20:32 -0500
The FCC administered test changed as time passed. When I took my exams in 1955 to 1958 (novice with a VE, general, 2nd telegraphy, and extra) sending was required. Though in 1956 when my dad took his
/archives//html/TenTec/2010-05/msg00497.html (10,776 bytes)

243. Re: [TenTec] Ten-Tec 411 Centaur Amp Problem (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Wed, 02 Jun 2010 14:46:39 -0500
Within the past few years, tests of Collins linears has not found the effects on linearity claimed for that magic length of coax. Even with the same transmitters and linears used decades ago. The 30S
/archives//html/TenTec/2010-06/msg00017.html (11,911 bytes)

244. Re: [TenTec] Fw: Ten-Tec 411 Centaur Amp Problem (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Wed, 02 Jun 2010 14:48:31 -0500
A single 811 usually has a cathode Z of about 200 ohms, so three in parallel would be 67 ohms and put that in parallel with 150 ohms makes 50 ohms. The low pass filter has the only reactive component
/archives//html/TenTec/2010-06/msg00018.html (8,593 bytes)

245. Re: [TenTec] Ten-Tec 411 Centaur Amp Problem (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Wed, 02 Jun 2010 14:51:40 -0500
If its not been opened up, then it has the 15 meter low pass filter on the input board just like the schematic shows. I still think the problem is with that filter or its connections to make a tuned
/archives//html/TenTec/2010-06/msg00020.html (10,051 bytes)

246. Re: [TenTec] Ten-Tec 411 Centaur Amp Problem (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Wed, 02 Jun 2010 14:55:29 -0500
Art Collins did NOT design the 30S-1. At the time it was designed he had upwards of 15,000 employees. He stuck his fingers in the design group but he only approved or disapproved of designs he didn't
/archives//html/TenTec/2010-06/msg00021.html (9,975 bytes)

247. Re: [TenTec] Ten-Tec 411 Centaur Amp Problem (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Wed, 02 Jun 2010 14:56:53 -0500
And so the driver and the PA don't interact so much. Remember all the plate current flows in the cathode too (plus grid current) so the input and the output tuned circuits are in series with the tube
/archives//html/TenTec/2010-06/msg00022.html (9,017 bytes)

248. Re: [TenTec] Ten-Tec 411 Centaur Amp Problem S-O-L-V-E-D (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sat, 05 Jun 2010 13:43:12 -0500
I presume that TenTec has an FCC approved mod given out only to licensed hams that substitutes a different filter or your jumper. That series tuned trap in the present filter is probably resonant at
/archives//html/TenTec/2010-06/msg00085.html (8,962 bytes)

249. Re: [TenTec] Centurion 422B (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Tue, 08 Jun 2010 20:42:31 -0500
Dust. Needs vacuuming. 73, Jerry, K0CQ _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/tentec
/archives//html/TenTec/2010-06/msg00116.html (7,176 bytes)

250. Re: [TenTec] Centurion 422B (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Wed, 09 Jun 2010 21:29:22 -0500
One time fixing a BC transmitter where the rectifier bases were arcing over after a lightning transient came in on the power line, I chipped off the aluminum from the 872 ceramic and the ceramic sock
/archives//html/TenTec/2010-06/msg00128.html (10,229 bytes)

251. Re: [TenTec] Orion 2 Firmware 2.044A Released (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 11 Jun 2010 12:14:53 -0500
The best monitor for output and modulation is an oscilloscope. With it, you can see carrier level changes and overmodulation, both upward and downward. The 100 watt linear will start to clip upward m
/archives//html/TenTec/2010-06/msg00160.html (15,537 bytes)

252. Re: [TenTec] Orion 2 Firmware 2.044A PTT (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sat, 12 Jun 2010 08:53:13 -0500
If the carrier stays at 14.5 watts, the peaks can only be 58 watts for full modulation. As a practical manner, the difference between 80 watts and 100 watts can only be measured locally, not at any d
/archives//html/TenTec/2010-06/msg00175.html (16,638 bytes)

253. Re: [TenTec] Orion 2 Firmware 2.044A PTT (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sat, 12 Jun 2010 12:00:29 -0500
While a bit more than 100% positive modulation is possible, it comes with distortion of the modulating waveform, and when hams (in the long) past have invented schemes for 200% or greater positive mo
/archives//html/TenTec/2010-06/msg00186.html (10,173 bytes)

254. Re: [TenTec] Titan 425 Fan (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sat, 12 Jun 2010 12:12:09 -0500
It should be practical to fix a motor. If the bearings are bronze, likely a drop of sewing machine oil will lubricate them. If ball bearing, getting the oil in is more difficult. If ball bearings mos
/archives//html/TenTec/2010-06/msg00187.html (8,874 bytes)

255. Re: [TenTec] re Orion AM ALC (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sat, 12 Jun 2010 20:59:35 -0500
Now you are delivering distorted audio to the modulator, probably with some DC offset that isn't supported by capacitor or transformer coupled audio stages. To get asymmetrical modulation without ove
/archives//html/TenTec/2010-06/msg00194.html (7,877 bytes)

256. Re: [TenTec] Orion AM ALC (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sun, 13 Jun 2010 13:13:01 -0500
When you average an audio signal amplified with an AC amplifier, e.g. capacitor or transformer coupled there is no DC component. It probably is symmetrical about that average value. So when it gets t
/archives//html/TenTec/2010-06/msg00204.html (10,684 bytes)

257. Re: [TenTec] Orion AM ALC (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 14 Jun 2010 09:14:58 -0500
http://www.arrl.org/files/file/Technology/pdf/5610027.pdf And I recall its author loosing his license by insisting ultra modulation met the FCC rules, probably 57 or '58. My general was dated October
/archives//html/TenTec/2010-06/msg00211.html (13,877 bytes)

258. Re: [TenTec] Orion AM ALC (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Wed, 16 Jun 2010 22:05:47 -0500
Normally in high level modulation the PA has to produce a peak power 4 times the carrier power, that's accomplished by doubling the supply voltage in a plate modulator. That works IF the tubes can ta
/archives//html/TenTec/2010-06/msg00237.html (12,136 bytes)

259. Re: [TenTec] TL or TH 304's (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 18 Jun 2010 11:50:59 -0500
Yes, because the 304T was essentially the guts of four 75T in one envelope. The filaments were oversized for the plate to make them very good pulse tubes and their original purpose was pulse modulati
/archives//html/TenTec/2010-06/msg00301.html (12,708 bytes)

260. Re: [TenTec] microphone for Corsair (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 18 Jun 2010 16:33:52 -0500
RS stocks that connector, under CB microphone connector. CB/Ham Mic Plug | Catalog #: 274-001 They say Thompson Plaza is the closest to your zip code. 73, Jerry, K0CQ ________________________________
/archives//html/TenTec/2010-06/msg00303.html (8,171 bytes)

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