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221. Re: [TenTec] Omni C question (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Tue, 11 May 2010 00:58:26 -0500
All the more reason to have some on hand because such parts tend to not be made anymore and so to go out of stock. Power supply issues as in dried out electrolytic bypass capacitors near the controll
/archives//html/TenTec/2010-05/msg00087.html (15,154 bytes)

222. Re: [TenTec] Omni VI cw signals (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 14 May 2010 09:19:51 -0500
There are also complaints of a chirp from the Omni VI. Typically heard only by other Omni VI users. It is a fact that the BFO crystal is shifted at key closure from receive to transmit. So it is hear
/archives//html/TenTec/2010-05/msg00125.html (9,446 bytes)

223. Re: [TenTec] Omni VI cw signals (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 17 May 2010 10:23:30 -0500
Dirty power supply connections can happen to every user. Perhaps a regular cleaning interval is indicated, something like every year or two. Accompanied by a drop of DeoxIT on the contact surfaces to
/archives//html/TenTec/2010-05/msg00165.html (12,894 bytes)

224. Re: [TenTec] Omni VI cw signals (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 17 May 2010 10:42:18 -0500
FT847 and FT857 are entirely different radios. The 857 and 897 are practically identical with the 897 package having room for an internal battery for portable use. The 857s I have do very well with s
/archives//html/TenTec/2010-05/msg00166.html (11,849 bytes)

225. Re: [TenTec] Airpax (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 17 May 2010 10:48:00 -0500
Comparing the time and current curves for a fuse and the specified circuit breaker, I concluded that a 15 amp ATC fuse from a reputable maker, like Buss, is as fast as the breaker rated at 20 amps. A
/archives//html/TenTec/2010-05/msg00167.html (10,226 bytes)

226. Re: [TenTec] Airpax (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 17 May 2010 10:52:10 -0500
Working with 1 KW solid state servo amps in about 1964, I came to a different conclusion. I concluded that the fastest silver element fuse was a reliable indicator that the protected transistor had a
/archives//html/TenTec/2010-05/msg00168.html (9,171 bytes)

227. Re: [TenTec] Airpax ID (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 17 May 2010 11:06:26 -0500
As I recall, the 1ELK1 and 1REC5 apply to mounting and finish colors, perhaps the presence of auxiliary indicating contacts. The critical parts are the 51 for time delay and the 20.0. Check the Airpa
/archives//html/TenTec/2010-05/msg00170.html (7,749 bytes)

228. Re: [TenTec] Omni VI cw signals (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 17 May 2010 11:19:50 -0500
Since the same BFO crystal is used for receive and for transmit and with full QSK, that crystal frequency has to be shifted 700 or 800 Hz, part of the unique to the radio characteristic may be from t
/archives//html/TenTec/2010-05/msg00171.html (10,577 bytes)

229. Re: [TenTec] TT 708 Microphone Wiring (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 21 May 2010 13:21:21 -0500
Doesn't the 708 come wired with an 8 pin connector? Tentec has an adapter from 8 pin to 4 pin. 73, Jerry, K0CQ _______________________________________________ TenTec mailing list TenTec@contesting.co
/archives//html/TenTec/2010-05/msg00234.html (7,651 bytes)

230. Re: [TenTec] TT 708 Microphone Wiring (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 21 May 2010 19:56:16 -0500
Here's my wild guess, working without data. I suspect there are four wires in the cable, colored black, white, red, and green. I suspect black is ground for PTT, and white is PTT. Red is audio and gr
/archives//html/TenTec/2010-05/msg00243.html (9,383 bytes)

231. Re: [TenTec] TT 708 Microphone Wiring (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sat, 22 May 2010 10:28:17 -0500
Well, I guessed one wire color out of four correctly. Now the question is why TT doesn't have this data on line? 73, Jerry, K0CQ _______________________________________________ TenTec mailing list Te
/archives//html/TenTec/2010-05/msg00258.html (8,851 bytes)

232. Re: [TenTec] wither CW? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 24 May 2010 17:39:43 -0500
My top straight key speed was once 29 wpm. I've not tested for that again, but I sent an hour at a time at 22 wpm giving my dad code practice and I keep up with FD contacts with a straight key at 25
/archives//html/TenTec/2010-05/msg00304.html (13,003 bytes)

233. Re: [TenTec] wither CW (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Wed, 26 May 2010 16:00:45 -0500
In the old days, you had better learn on a straight key because you had to pass a sending test with the FCC's straight key. It took a medical exemption to take the sending test any other way. I think
/archives//html/TenTec/2010-05/msg00403.html (10,205 bytes)

234. Re: [TenTec] headsets (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Wed, 26 May 2010 17:01:37 -0500
You want to find CW contacts with lots of noise, explore those from microwave EME. There a signal out of the noise a couple dB gets a 599 report! There are many posted on line. Look for stations like
/archives//html/TenTec/2010-05/msg00407.html (9,888 bytes)

235. Re: [TenTec] Ten-Tec 411 Centaur Amp Problem (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Thu, 27 May 2010 13:47:36 -0500
That would tend to indicate the cathode circuit tuning is out of whack on 40 meters, whether it just needs tuning or some parts have change value, is what you have to find next. 73, Jerry, K0CQ _____
/archives//html/TenTec/2010-05/msg00437.html (13,816 bytes)

236. Re: [TenTec] Ten-Tec 411 Centaur Amp Problem (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Thu, 27 May 2010 15:02:35 -0500
In the trouble shooting section it says if the input SWR is high, the input board is loose, meaning its lost some or all of its grounds. Seems to me that's always a good thing to check, then there's
/archives//html/TenTec/2010-05/msg00446.html (11,029 bytes)

237. Re: [TenTec] Omni C (Model 546C) front end... (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Thu, 27 May 2010 15:04:52 -0500
What happened to it? Lightning? Stuck TR switch? Mouse? I don't have the circuit handy but its likely a fairly common style of construction for Tentec. Very likely another input coil from another ban
/archives//html/TenTec/2010-05/msg00447.html (8,967 bytes)

238. Re: [TenTec] Paragon - easy to work on? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Thu, 27 May 2010 16:16:40 -0500
For regular sized pots, look for the RV4 types, for minatures look for RV6 types at Mouser and Digi-Key. Cramolin makes a special cleaner for pots saying DeoxIT may soften the carbon layer. I've not
/archives//html/TenTec/2010-05/msg00448.html (11,016 bytes)

239. Re: [TenTec] Omni C (Model 546C) front end... (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Thu, 27 May 2010 17:11:09 -0500
RF coils don't go bad often, and then its one of the causes I mentioned, lightning or transmit power and then it usually shows up with smoke residue in the vicinity. I nearly always expect the transi
/archives//html/TenTec/2010-05/msg00450.html (10,233 bytes)

240. Re: [TenTec] Ten-Tec 411 Centaur Amp Problem (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Thu, 27 May 2010 18:21:55 -0500
There is no input bandswitch. There are no bandswitching relays. There is a low pass filter and a resistor. The stock lowpass in the manual cuts off to prevent use at 11 and 10 meters. The 10 meter o
/archives//html/TenTec/2010-05/msg00452.html (17,222 bytes)

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