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1. Re: [TenTec] Schematic for 311 Band Data Decoder? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Thu, 18 Jun 2009 14:28:26 -0600
http://www.tentecwiki.org/webarchive/311/ Says its an inverter. Takes open collector lows from the Orion and pulls its outputs high using a surface mount 2N3906 PNP transistor on each line. Probably
/archives//html/TenTec/2009-06/msg00101.html (8,381 bytes)

2. Re: [TenTec] Schematic for 311 Band Data Decoder? More than you ever wanted to know. (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Thu, 18 Jun 2009 17:46:51 -0600
I've downloaded the 565, 566, and 420 manuals plus the data sheet for a UDN2982A and read the band connector data in the Tentec manuals. The outputs of the Orions is a low, one wire per band. Its ope
/archives//html/TenTec/2009-06/msg00103.html (9,792 bytes)

3. Re: [TenTec] Omni VI plus receiver problem (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sat, 27 Jun 2009 08:28:05 -0600
Contact and switch cleaning is MUCH more effective with a contact cleaner like DeoxIT from Cramolin than by mere abrasion. It just takes a fraction of a drop per contact and its not a good idea to so
/archives//html/TenTec/2009-06/msg00129.html (8,369 bytes)

4. Re: [TenTec] [TEN TEC] Centaur (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 29 Jun 2009 10:30:16 -0600
RF power takes big relays. Big relays have lots a mass in motion and it makes a bang when it hits the contacts and stops. Some relays make more noise than others, and the mounting can easily amplify
/archives//html/TenTec/2009-06/msg00146.html (9,363 bytes)

5. Re: [TenTec] Centaur (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 29 Jun 2009 10:36:33 -0600
Or working unless the path is particularly difficult. 100 watts can work the world. 73, Jerry, K0CQ _______________________________________________ TenTec mailing list TenTec@contesting.com http://li
/archives//html/TenTec/2009-06/msg00147.html (8,506 bytes)

6. Re: [TenTec] Centaur (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 29 Jun 2009 16:08:45 -0600
At your stage in learning you don't want the distraction of QSK. Not one bit. Turn QSK off, let the TR change twice per transmission (beginning and end). Then the noise won't bother you. I assure the
/archives//html/TenTec/2009-06/msg00153.html (10,478 bytes)

7. Re: [TenTec] [TEN TEC] Centaur (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 29 Jun 2009 17:01:41 -0600
Because you are using PTT or VOX with considerably delay that holds the rig in transmit for whole phrases, or longer. Not at a syllabic rate. 73, Jerry, K0CQ _________________________________________
/archives//html/TenTec/2009-06/msg00156.html (8,743 bytes)

8. Re: [TenTec] Centaur (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Tue, 30 Jun 2009 11:29:13 -0600
If the noise comes from dry bearings, sometimes they can be lubricated. Usually under the label is where the bearing is. Cut an X or slot in the middle and inject some fine oil, like sewing machine o
/archives//html/TenTec/2009-06/msg00183.html (8,653 bytes)

9. Re: [TenTec] Omni D unstable digital readout (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Tue, 30 Jun 2009 13:49:09 -0600
Counters in Corsair IIs have problems with dried out electrolytics bypassing and maybe coupling on the counter board. Their counter is a microprocessor chip, so also supplies the keyer function. I'd
/archives//html/TenTec/2009-06/msg00186.html (8,216 bytes)

10. Re: [TenTec] unstable Omni D display fix-problem found (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sat, 11 Jul 2009 20:40:00 -0600
What are the chips? 73, Jerry, K0CQ _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/tentec
/archives//html/TenTec/2009-07/msg00030.html (8,833 bytes)

11. Re: [TenTec] unstable Omni D display fix-problem found (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sun, 12 Jul 2009 11:38:53 -0600
Actually both are simply drivers, one open collector, the other open emitter. One for driving LED cathodes, the other driving LED anodes. Only drive. Jameco has 75492. Mouser has NTE75491, under $5 e
/archives//html/TenTec/2009-07/msg00035.html (11,615 bytes)

12. Re: [TenTec] Omni VI problems (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Wed, 15 Jul 2009 08:05:52 -0600
Lift the lid. Tighten all the board mounting screws. Check the microphone cable. See if it happens with the microphone disconnected. Just yesterday someone noted they found their hum came from a brok
/archives//html/TenTec/2009-07/msg00061.html (8,448 bytes)

13. Re: [TenTec] Circuit question - Omni VI type 563 (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 17 Jul 2009 15:05:47 -0600
The 1N4007 because of its high voltage rating is a PIN diode. That makes it a little bit better RF switching diode than a 1N4148 silicon high speed diode. It is very rugged which is an advantage, it
/archives//html/TenTec/2009-07/msg00071.html (8,910 bytes)

14. Re: [TenTec] Omni VI problems fixed (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 17 Jul 2009 15:11:40 -0600
Over the last 30 years, I expect that cure has fixed more than 25 radios, some here on my bench, my own radios, many on the air or via internet. Fact is squeezing the ground connection with plastic l
/archives//html/TenTec/2009-07/msg00072.html (9,579 bytes)

15. Re: [TenTec] Circuit question - Omni VI type 563 (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sun, 19 Jul 2009 10:29:19 -0600
If they are all in the receive line, most any PIN diode will work better than the 1N4007. Need only enough reverse bias capability to handle the transmit voltage. RF parts has a screen full of PIN di
/archives//html/TenTec/2009-07/msg00077.html (8,761 bytes)

16. Re: [TenTec] Collins group (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Tue, 18 Aug 2009 13:21:45 -0600
There is the Collins Radio Association, www.collinsra.com and the Collins Collector's Association www.collinsradio.org, both have mailing list reflectors. The 312B5 was expensive comparatively when n
/archives//html/TenTec/2009-08/msg00142.html (8,434 bytes)

17. Re: [TenTec] ALC - How does it work ? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Wed, 19 Aug 2009 15:09:17 -0600
Basically ALC (Automatic Level Control) detects RF output power or voltage and lowers the transmitter gain to keep the output power or voltage in a linear region of the amplifiers. Its like AGC on re
/archives//html/TenTec/2009-08/msg00156.html (9,368 bytes)

18. Re: [TenTec] Using David Clark phones (and boom mic) with Omni VI+? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Wed, 19 Aug 2009 17:06:17 -0600
A google search turned up the best price of $44.99 with free FedEx ground delivery at Sam Ash Music. So I ordered one. 73, Jerry, K0CQ _______________________________________________ TenTec mailing l
/archives//html/TenTec/2009-08/msg00157.html (8,742 bytes)

19. Re: [TenTec] ALC - How does it work ? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Thu, 20 Aug 2009 12:04:04 -0600
The trouble with a high SWR on a solid state transmitter is that the output matching is not adjustable to present the design load to the output transistors which can affect the longevity of the outpu
/archives//html/TenTec/2009-08/msg00162.html (8,562 bytes)

20. Re: [TenTec] Burghardt amateur center (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 21 Aug 2009 09:12:07 -0600
I drove by the store two weeks ago this evening. Looked bare, no antennas showing, grass growing through the cracks in the parking lot. I didn't bother checking on Saturday morning to see if there wa
/archives//html/TenTec/2009-08/msg00166.html (8,666 bytes)

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