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381. Re: [TenTec] Omni VI Opt 1 or Omni VI + ? (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Fri, 20 Apr 2007 18:56:53 -0600; Noise blankers work on STRONG noise like ignition and power line noise, but not on lighting static or most switch noise. Some DSP NR does work on those other noises. 73, Jerry, K0CQ _________________; /archives//html/TenTec/2007-04/msg00359.html (8,968 bytes)
382. Re: [TenTec] Omni VI Pass Band Tuning CW Narrow (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Fri, 20 Apr 2007 19:14:41 -0600; The pass band tuning does NOT adjust the 6.3 MHz filters. It moves the 9 to 6.3 MHz offset oscillator which changes the effective frequency of the fixed frequency 6.3 MHz filter. After the 6.3 MHz fi; /archives//html/TenTec/2007-04/msg00360.html (11,531 bytes)
383. Re: [TenTec] RF gets into computer (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Sun, 22 Apr 2007 10:33:19 -0600; Seeing the problem cured with the dummy load points to the antenna. You need to either reduce power or move the antenna. You are getting plenty of RF exposure that close to the antenna as the compute; /archives//html/TenTec/2007-04/msg00390.html (9,237 bytes)
384. Re: [TenTec] RF gets into computer (ADT Alarm System) (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Sun, 22 Apr 2007 11:34:07 -0600; Moving the 40 meter antenna may help, but it sounds as if the alarm wiring needs some RF filtering with bypass capacitors and toroids or RF chokes. Its probably some wire in the alarm system is nearl; /archives//html/TenTec/2007-04/msg00393.html (8,414 bytes)
385. Re: [TenTec] RF gets into computer (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Sun, 22 Apr 2007 11:39:02 -0600; Antenna at 15' I call close. If the feed line is radiating that makes it worse and even with a balun at the antenna, if the feed line isn't at right angles to the antenna RF will be coupled to the ou; /archives//html/TenTec/2007-04/msg00394.html (11,981 bytes)
386. Re: [TenTec] Slaving radios (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Sun, 22 Apr 2007 11:54:12 -0600; The rules, RS-232 say 50'. Those rules also limit the drive current to more limit the distance to that 50'. I had a commercial modem once that for RF filtering had a .01 across the signal lines. An R; /archives//html/TenTec/2007-04/msg00399.html (9,988 bytes)
387. Re: [TenTec] RF gets into computer (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Mon, 23 Apr 2007 13:09:13 -0600; For RF filtering, ferrite with a much higher permeability (and loss at HF) is preferred to what one would use for a transformer core at the same frequency. Essentially the higher the permeability the; /archives//html/TenTec/2007-04/msg00410.html (10,844 bytes)
388. Re: [TenTec] V2.060b Release Comments (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Wed, 25 Apr 2007 11:52:31 -0600; Perhaps the difference noted comes from differences in headphone impedances and sensitivity. Probably the TX/RX click comes from that mode switching and is fixed in voltage amplitude. If that is the; /archives//html/TenTec/2007-04/msg00460.html (9,686 bytes)
389. Re: [TenTec] transverters (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Sun, 29 Apr 2007 09:58:31 -0600; SSB is from Sweden, DEMI from New Jersey, but moving to Florida, not taking any orders until June. Also look for Kuhn Electronics, DB6NT from Germany. All good products available in various versions; /archives//html/TenTec/2007-04/msg00587.html (8,293 bytes)
390. Re: [TenTec] transverters (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Sun, 29 Apr 2007 11:21:40 -0600; Yes, I see that. Now who makes transverters in Sweden? Parabolic? 73, Jerry, K0CQ _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com; /archives//html/TenTec/2007-04/msg00589.html (8,122 bytes)
391. Re: [TenTec] transverters (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Sun, 29 Apr 2007 17:48:17 -0600; Yah, the Tentec transverters set a price no one else has met in a long time, but are sometimes lower power and lower sensitivity. I have a 2m to 6m transverter that would work better with hard keying; /archives//html/TenTec/2007-04/msg00596.html (8,375 bytes)
392. Re: [TenTec] Omni 6 (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Thu, 17 May 2007 19:02:30 -0600; Believe it. The grounding through the board mounting screws goes bad with age. The plastic of the board does what its name says, it flows under pressure and relieves that pressure and so some of the; /archives//html/TenTec/2007-05/msg00249.html (8,924 bytes)
393. Re: [TenTec] Omni VII meter. (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Sat, 19 May 2007 01:10:02 -0600; Casual observation from afar would hint its showing that for the result of dividing 0 by 0. Perhaps the SWR indication needs to have more hang but to be inhibited until there is signal or to be total; /archives//html/TenTec/2007-05/msg00266.html (8,937 bytes)
394. Re: [TenTec] Omni VII meter. (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Sat, 19 May 2007 01:10:45 -0600; Casual observation from afar would hint its showing that for the result of dividing 0 by 0. Perhaps the SWR indication needs to have more hang but to be inhibited until there is signal or to be total; /archives//html/TenTec/2007-05/msg00267.html (8,761 bytes)
395. Re: [TenTec] When did Ten-tec switch to Schottky diode ring mixers? (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Sun, 20 May 2007 20:48:43 -0600; The bipolar RF (and first IF) stage uses transformer feedback with a three winding transformer. Its a circuit developed for the output stages of cable TV distribution amplifiers where acceptable inte; /archives//html/TenTec/2007-05/msg00297.html (11,018 bytes)
396. Re: [TenTec] (Orion) firmware update with serial port-less computer (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Mon, 21 May 2007 08:20:11 -0600; Jameco and probably JDR Microdevices carry 4 port RS-232 serial cards, probably generic bus and surely PCI bus these days. Should drop in and come with suitable drivers. USB can be stacked with a hub; /archives//html/TenTec/2007-05/msg00307.html (9,621 bytes)
397. Re: [TenTec] When did Ten-tec switch to Schottky diode ring mixers? (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Mon, 21 May 2007 20:22:11 -0600; Perhaps I mis-wrote. Its not really an optional preamp but the entire RF stage that is unhooked connecting the antenna directly to the mixer. Some might consider that the normal RF stage, not a pream; /archives//html/TenTec/2007-05/msg00318.html (10,314 bytes)
398. Re: [TenTec] Orion XVTR RF output (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Tue, 22 May 2007 17:46:48 -0600; Primarily ALC is to protect the internal PA, to limit the drive so the intermod is acceptable. A secondary effect is to correct the analog transmitter gain for variations from band to band that ordin; /archives//html/TenTec/2007-05/msg00332.html (10,439 bytes)
399. Re: [TenTec] Receive 17m on Omni ,Tritons, etc. (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Thu, 24 May 2007 11:58:08 -0600; That's how 17m is done in the Corsair II with the annoyance that the natural sideband is lower, contrary to common usage. 72, Jerry, K0CQ _______________________________________________ TenTec mailin; /archives//html/TenTec/2007-05/msg00372.html (10,159 bytes)
400. Re: [TenTec] Receive 17m on Omni ,Tritons, etc. (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Thu, 24 May 2007 18:26:22 -0600; The 5 MHz VFO and 9 MHz IF was chosen long ago in the late 40s or early 50s for phasing rigs. The 5.3-7 MHz command set tuned down and using it for a VFO worked well because it was very stable. With; /archives//html/TenTec/2007-05/msg00378.html (10,109 bytes)

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