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Total 1055 documents matching your query.

321. Re: [TenTec] Orion 2 HW Noise Blanker (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 29 Jan 2007 11:48:52 -0600
That's exactly how the Collins noise blankers worked for the KWM-2 and the S-line more than 40 years ago. They used a 40 MHz antenna for the noise receiver thinking mostly automotive ignition noise
/archives//html/TenTec/2007-01/msg00923.html (8,714 bytes)

322. Re: [TenTec] Orion II key click report (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 29 Jan 2007 12:26:10 -0600
How much drive power does the PA take? The Orion is a bit notorious for setting power only with the ALC while keeping drive up (no adjustment for drive in CW mode) which tends to make a sharp corner
/archives//html/TenTec/2007-01/msg00924.html (10,720 bytes)

323. Re: [TenTec] Orion 2 HW Noise Blanker (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 29 Jan 2007 15:56:53 -0600
Yah, I saw "noise xxxxxer" with separate antenna and thought noise blanker with 40 MHz noise input. Noise cancelers at the antenna work on the noise antenna capturing full strength noise but not much
/archives//html/TenTec/2007-01/msg00928.html (10,495 bytes)

324. Re: [TenTec] Orion II key click report (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 30 Jan 2007 11:11:19 -0600
I have grown to like the power tin oxide film, sometimes called flame proof. I've tested them operating glowing red without permanent damage to the resistors element, only to the coating and their su
/archives//html/TenTec/2007-01/msg00971.html (12,333 bytes)

325. Re: [TenTec] Orion/O2 Drift Problem-who is interested in a fix? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 30 Jan 2007 11:36:36 -0600
Using boards designed by CT1CMK, its no tougher stabilizing a 44.45 MHz oscillator than stabilizing a 10 MHz with GPS. Takes different boards slightly. I think they are available from a couple source
/archives//html/TenTec/2007-01/msg00972.html (11,431 bytes)

326. Re: [TenTec] Orion/O2 Drift Problem-who is interested in a fix? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 30 Jan 2007 12:13:02 -0600
With a transverter, the drift of the HF rig will be reproduced, neither expanded nor contracted. So if the transverter oscillator doesn't drift the transverted signal drifts that same 50 Hz as it did
/archives//html/TenTec/2007-01/msg00973.html (11,517 bytes)

327. Re: [TenTec] Orion/O2 Drift Problem-who is interested in a fix? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 31 Jan 2007 09:09:52 -0600
You DON'T WANT the ordinary VCO for this application. You want a VCXO, voltage controlled crystal oscillator which can have pretty good phase noise and you don't phase lock it, you adjust its frequen
/archives//html/TenTec/2007-01/msg01002.html (10,718 bytes)

328. Re: [TenTec] 75 Ohm twin velocity factor ? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sat, 03 Feb 2007 17:16:40 -0600
The fields around high impedance ladder line are mostly in air, so the velocity is high. The fields around the 72 ohm transmitting twin lead are mostly in dielectric, its very close spaced, so the ve
/archives//html/TenTec/2007-02/msg00056.html (8,383 bytes)

329. Re: [TenTec] Paragon I (585) Roofing Filter (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 04 Feb 2007 14:12:43 -0600
Are you sure the first oscillator does all the fine tuning? Sometimes with that architecture the first oscillator goes in 10 KHz steps and the finer tuning is in the second oscillator and so that low
/archives//html/TenTec/2007-02/msg00064.html (9,042 bytes)

330. Re: [TenTec] Tried out the Extreme Isolation headphones (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Thu, 08 Feb 2007 13:29:51 -0600
How do these RF wireless devices stand up to 1.5 KW SSB in the back yard? 73, Jerry, K0CQ _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contes
/archives//html/TenTec/2007-02/msg00103.html (7,901 bytes)

331. Re: [TenTec] (no subject) (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sat, 10 Feb 2007 22:29:51 -0600
Try the bandpass tuning with the filters you have. You will find you can crank it down to virtually nothing (but not with as steep skirts as the narrow filter would have) and it will do quit good at
/archives//html/TenTec/2007-02/msg00140.html (7,943 bytes)

332. Re: [TenTec] Opinions wanted please about getting a second qrp rig (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 12 Feb 2007 11:37:16 -0600
<SNIP> Far too many FT-100D lost the VHF/UHF front end from poor grounding and oscillation of the transistor. So far the FT-857D which tends to run about $699 on sale but new and about 600 used seems
/archives//html/TenTec/2007-02/msg00175.html (10,713 bytes)

333. Re: [TenTec] Price Check, TT Argonaut 509 (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 19 Feb 2007 11:15:34 -0600
Crystals and good vfos are inherently better at phase noise than synthesizers. Omni V and VI and the Orion synthesize at VHF and divide down which helps their phase noise over the Paragon and Yaecomw
/archives//html/TenTec/2007-02/msg00302.html (8,136 bytes)

334. Re: [TenTec] Omni V vs. TS850 (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 20 Feb 2007 23:16:57 -0600
The TS850 was the first Yaecomwood radio that put a lot of attention to receiver dynamic range. It doesn't hold a candle to a Corsair II or later Tentec but compared to the import radio world it was
/archives//html/TenTec/2007-02/msg00351.html (7,747 bytes)

335. Re: [TenTec] Paragon II question (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 21 Feb 2007 14:20:21 -0600
Yes, it did. And some AM mods for S-lines did that too. -- 73, Jerry, K0CQ, Technical Advisor to the CRA All content copyright Dr. Gerald N. Johnson, electrical engineer _____________________________
/archives//html/TenTec/2007-02/msg00361.html (8,389 bytes)

336. Re: [TenTec] Commercial CW License (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sat, 24 Feb 2007 13:21:53 -0600
Oh, that's simpler than it was 48 years ago when I got my 2nd and ship's radar endorsement. Then the experience had to be AT SEA under the command of a holder of the first. Coast station didn't count
/archives//html/TenTec/2007-02/msg00431.html (9,035 bytes)

337. Re: [TenTec] Commercial CW License (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 25 Feb 2007 23:05:45 -0600
When I took the 2nd exam in 1958, there was only one receiving test, the examiner's choice of 16 code groups or 20 plain language. Because of the 16 code groups they didn't allow credit for the Am Ex
/archives//html/TenTec/2007-02/msg00461.html (9,642 bytes)

338. Re: [TenTec] OM7 on 40m in Europe (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Thu, 01 Mar 2007 10:43:21 -0600
<SNIP> The name "roofing filter" is new. The concept of getting selectivity close as possible to the antenna was put forth in a QST article in the 1960s. However multiple conversion receivers have be
/archives//html/TenTec/2007-03/msg00007.html (11,044 bytes)

339. Re: [TenTec] OMNI V 500 hz. filter (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sat, 03 Mar 2007 17:32:12 -0600
There have been articles in QST, ARRL Handbooks, Ham Radio magazine, and MFJ has a book on the design of crystal ladder filters. A classic Filter Design Handbook by Zverev also allows designing to ma
/archives//html/TenTec/2007-03/msg00031.html (9,658 bytes)

340. Re: [TenTec] running cw with generator question (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sat, 03 Mar 2007 20:47:46 -0600
The Honda will run variable speed. Its designed that way, with a low voltage generator and an electronic inverter. If rapid current changes are a bother, change over to a 12 volt system with a batter
/archives//html/TenTec/2007-03/msg00036.html (9,337 bytes)

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