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181. Re: [TenTec] Omni VI frequency error - problem solved (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 05 Sep 2008 07:38:10 -0600
CHU on 7335 has pretty good accuracy. There may still be a British, continental or Russian version of WWV or WWVH on 5, 10, and 15 MHz with super transmitted accuracy but on HF it takes a month of av
/archives//html/TenTec/2008-09/msg00051.html (12,454 bytes)

182. Re: [TenTec] Omni VI frequency error - problem solved (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 05 Sep 2008 14:12:10 -0600
That's exactly how its done. HF propagation isn't much better than that if you average doing the same time every day for a month. If the crystal trimmer had finer resolution you might be able to get
/archives//html/TenTec/2008-09/msg00056.html (10,111 bytes)

183. Re: [TenTec] Orion 2 and Xlog keyer (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 05 Sep 2008 18:37:20 -0600
So now you hav to build the transistor interface which isn't part of the computer or radio ports. Probably needs a NPN transistor with emitter grounded, collector to the radio key jack and base throu
/archives//html/TenTec/2008-09/msg00061.html (10,505 bytes)

184. Re: [TenTec] Orion 2 and Xlog keyer (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 05 Sep 2008 20:02:11 -0600
It is necessary to build. Probably $3 in connectors, plus 50 cents in parts. 73, Jerry, K0CQ.
/archives//html/TenTec/2008-09/msg00066.html (10,593 bytes)

185. Re: [TenTec] Aux Antenna on Omni VI/opt-3 (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 09 Sep 2008 16:32:48 -0600
The auxiliary antenna input will work just the same. Its a simple connection opened by the switch to let the receiver use a different antenna than when transmitting. Most often used for 160 and 80 me
/archives//html/TenTec/2008-09/msg00123.html (8,924 bytes)

186. Re: [TenTec] PTO adjustment (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 14 Sep 2008 17:21:42 -0600
Belleville washers are coned a bit and often used for very stiff springs. Look at www.mcmaster.com catalog number 93497A120 for a metric Belleville washer suitable for 3mm and #4 or #5 screws.. Look
/archives//html/TenTec/2008-09/msg00179.html (8,698 bytes)

187. Re: [TenTec] Delta 580/corsair 560 (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 15 Sep 2008 11:06:01 -0600
It should. It should have even the same part number for both applications. I don't know what the VFO might be worth, 500 Hz CW filter may be worth $60 or so. It may fit every Tentec through the Orion
/archives//html/TenTec/2008-09/msg00195.html (8,295 bytes)

188. Re: [TenTec] rcw (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 16 Sep 2008 00:08:39 -0600
That LSB preference was copied from ICOM (as are the radio digital control codes). But there is an application that makes the use of LSB for CW obnoxious. Because of that I have a Corsair II (which d
/archives//html/TenTec/2008-09/msg00207.html (10,193 bytes)

189. Re: [TenTec] 546c advice (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 17 Sep 2008 15:38:41 -0600
17 Meters is 18 MHz. The IF is 9 MHz. The mixing scheme in that vintage Omni mixed the PTO to 9 MHz. Mixers put out lots of second harmonic, especially from the LO input. It probably was stronger tha
/archives//html/TenTec/2008-09/msg00220.html (8,604 bytes)

190. Re: [TenTec] What am I missing here? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 26 Sep 2008 19:39:22 -0600
Icoms have a really bad habit for VHF operation. They shift to LSB for CW. Many a QSO on 6m and up is done mixed mode running SSB and CW on the same frequency, or modes are switched rapidly at both e
/archives//html/TenTec/2008-09/msg00322.html (8,707 bytes)

191. Re: [TenTec] What am I missing here? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sat, 27 Sep 2008 10:21:58 -0600
Yes, if its there, but the user I talked to on 2m last week didn't know of it and I wasn't the first to mention the problem to him. I have other problems with Icom so I don't know and I won't know fr
/archives//html/TenTec/2008-09/msg00324.html (8,704 bytes)

192. Re: [TenTec] 527 6N2 Radio Deviation (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 01 Aug 2008 20:38:50 -0600
There is no indicator in the radio for FM modulation. What works best is to have some one listen with the narrowest FM receiver (likely a repeater but possibly a rice box) that needs to copy it and b
/archives//html/TenTec/2008-08/msg00007.html (8,579 bytes)

193. Re: [TenTec] 527 6N2 Radio Deviation (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 01 Aug 2008 20:48:35 -0600
That makes no sense at ALL. The RF power output should be the same with modulation or no modulation at all. And should be quite significant, e.g. full CW key down power level. Maybe it means that cra
/archives//html/TenTec/2008-08/msg00009.html (8,227 bytes)

194. Re: [TenTec] pilot light bulbs (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 03 Aug 2008 16:33:01 -0600
LEDs may disappoint you very much. Tungsten lamps put out light in all directions but through the base, LEDs put out a narrow beam out the front only, they are hard to get spread light with installin
/archives//html/TenTec/2008-08/msg00031.html (9,129 bytes)

195. Re: [TenTec] pilot light bulbs (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 04 Aug 2008 10:02:04 -0600
A GE tungsten lamp book that I have gives these rules of thumb. Lowering the supply voltage by 5% reduces the light output by 10% while doubling the lamp life. Conversely, raising the voltage by 5% i
/archives//html/TenTec/2008-08/msg00041.html (10,642 bytes)

196. Re: [TenTec] pilot light bulbs (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 04 Aug 2008 15:18:51 -0600
I prefer a resistor to a gaggle of diodes. The status lites panel on an 821A-1 transmitter contained 41 or 42 lamps, all running 28 volts. Takes at least 4 diodes to make a useful drop for each lamp,
/archives//html/TenTec/2008-08/msg00047.html (10,298 bytes)

197. Re: [TenTec] pilot light bulbs (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 04 Aug 2008 16:11:23 -0600
Those are EXACTLY the trade offs I wrote about. Longer life less light output (and MSCP IS Mean Spherical Candle Power, e.g. in all directions) for the same electrical power. The longer lived lamp wi
/archives//html/TenTec/2008-08/msg00051.html (11,416 bytes)

198. Re: [TenTec] pilot light bulbs (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 04 Aug 2008 17:09:38 -0600
But I also think that reducing the turn on surge current by 60+% that the resistor accomplishes compared to the 10% reduction of the diodes also significantly enhances lamp life. 73, Jerry, K0CQ
/archives//html/TenTec/2008-08/msg00052.html (10,042 bytes)

199. Re: [TenTec] OT: a neat way to make a rotatable dipole (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 05 Aug 2008 08:46:16 -0600
I propose a test. On a short tube, assemble the same number of toroids. e.g. just the choke, no radiators. Measure the impedance. Wide SWR bandwidth makes me suspicious there's considerable resistive
/archives//html/TenTec/2008-08/msg00058.html (8,247 bytes)

200. Re: [TenTec] Soviet Product Obsolescence (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sat, 09 Aug 2008 20:44:57 -0600
I think the passive components will survive the EMP as good as the tubes and far better than early solid state. Today's solid state (FET) devices and circuits have a better chance of surviving than t
/archives//html/TenTec/2008-08/msg00128.html (10,269 bytes)

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