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1. Re: [TenTec] Omni VII Query (score: 1)
Author: "geraldj" <geraldj@storm.weather.net>
Date: Thu, 10 Dec 2009 02:49:20 -0600
In a radio communications circuit with a logarithmic signal strength display, 10% is less than 1/2 dB and the meter increments are typically 1 S unit of 6 dB, that 1/2 dB error is not detectable. And
/archives//html/TenTec/2009-12/msg00077.html (11,255 bytes)

2. Re: [TenTec] Colliins SWR Bridge (score: 1)
Author: "geraldj" <geraldj@storm.weather.net>
Date: Sun, 13 Dec 2009 01:15:58 -0600
Yes. 73, Jerry, K0CQ
/archives//html/TenTec/2009-12/msg00102.html (9,206 bytes)

3. Re: [TenTec] Distortion SSB Omni VII (score: 1)
Author: "geraldj" <geraldj@storm.weather.net>
Date: Sat, 21 Nov 2009 19:14:46 -0600
The one I bought says it needs phantom power or using the battery box that came with it. I've not used it to transmit, just to receive and it did well for that over a couple days of microwave operati
/archives//html/TenTec/2009-11/msg00221.html (10,391 bytes)

4. Re: [TenTec] Reverse Current Protection (score: 1)
Author: "geraldj" <geraldj@storm.weather.net>
Date: Thu, 26 Nov 2009 17:15:52 -0600
There are a some reliable, and yet energy efficient techniques. If you can stand voltage drop, a simple series silicon diode is effective. If you can't stand voltage drop and want to keep it simple,
/archives//html/TenTec/2009-11/msg00316.html (8,415 bytes)

5. Re: [TenTec] OMNI D BFO problem (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sat, 06 Jun 2009 20:27:32 -0600
Not so. With the 9 MHz IF and the 5 MHz VFO the BFO remains on the same side for all N and is on LSB for 80 and 40 and on USB for 20 without changing the BFO. There won't be an LSB signals on 20, nor
/archives//html/TenTec/2009-06/msg00014.html (10,038 bytes)

6. Re: [TenTec] Help with gel cell battery and solar charging system.... (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 07 Jun 2009 20:27:29 -0600
There is a ham made product for getting 13.8 volts out of a 12 volt lead acid battery, surely its not noisy. Whether it would handle an Orion II at full transmit, I don't know. Fully wet cells are th
/archives//html/TenTec/2009-06/msg00021.html (13,456 bytes)

7. Re: [TenTec] Isolation of diode T/R Switch on Corsair (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 07 Jun 2009 20:42:42 -0600
Mismatches in probe compensation won't affect taking ratios, but might affect absolute voltages on the receiver port. And when you are at 40+ dB attenuation at 28 MHz stray coupling and imperfect sh
/archives//html/TenTec/2009-06/msg00022.html (11,156 bytes)

8. Re: [TenTec] Kinda OT (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 08 Jun 2009 11:01:31 -0600
Except that at 20 amps the .15 ohm resistor drops 3 volts while the 1 ohm resistor drops 20 volts. Look at www.mouser.com for a .15 ohm 50 watt resistor. Else you need about 7 1 ohm 7 watt resistors
/archives//html/TenTec/2009-06/msg00030.html (8,607 bytes)

9. Re: [TenTec] Kinda OT (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 08 Jun 2009 15:28:30 -0600
Maybe, except the reason for the resistor is probably to make power transistors share the load for thermal balance and the metal in a fuse is likely to not be very temperature stable. 73, Jerry, K0CQ
/archives//html/TenTec/2009-06/msg00032.html (9,489 bytes)

10. Re: [TenTec] Isolation of diode T/R Switch on Corsair (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 09 Jun 2009 10:13:02 -0600
Its possible to measure that here, but I have other projects in line first. Did you check the resistors for drift in value? A pin diode's resistance (and that's critical in shunt mode) depends a grea
/archives//html/TenTec/2009-06/msg00034.html (10,264 bytes)

11. [TenTec] [Fwd: Ten Tec archives] (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Thu, 11 Jun 2009 11:09:07 -0600
-- Forwarded Message -- I have only Corsair II data and there are no diodes on the counter board, but a gang of diodes could have been used in the Corsair to convert band data to binary for the proce
/archives//html/TenTec/2009-06/msg00038.html (9,590 bytes)

12. Re: [TenTec] Changing 1208 transverter to 10M IF? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 15 Jun 2009 09:27:04 -0600
Yes, getting rid of the harmonics of 22 and 28 at 44 and 56 MHz at the transverter output. That's why TenTec didn't sell a 28 to 50 they made it 14 to 50 to move the harmonics further away from 50. O
/archives//html/TenTec/2009-06/msg00075.html (8,024 bytes)

13. Re: [TenTec] Changing 1208 transverter to 10M IF? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 15 Jun 2009 22:03:34 -0600
Those harmonics are a problem in any 28 to 50 MHz transverter, why some use 14 to 28 to reduce the problems, especially with the 2nd harmonic of the crystal. Down East Microwave, DB6NT, and Elecraft
/archives//html/TenTec/2009-06/msg00078.html (9,214 bytes)

14. Re: [TenTec] OT: cleaners, etc (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Thu, 30 Apr 2009 21:36:42 -0600
Crystals. Look at a sheet of hot dipped galvanized tin. Lots of crystal shows there. The crystals are hard enough to break through the thin aluminum oxide to make good connections. Sure you can make
/archives//html/TenTec/2009-05/msg00000.html (9,290 bytes)

15. Re: [TenTec] OT: cleaners, etc (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 01 May 2009 00:40:17 -0600
That's our point. That is not all SS and it will rust rapidly out in the weather. The point is all SS clamps ARE available and do weather better. Sources that I know of include McMaster-Carr, Heartla
/archives//html/TenTec/2009-05/msg00009.html (8,772 bytes)

16. Re: [TenTec] parts not SS (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 01 May 2009 00:47:04 -0600
There is Scotch 33 (or 88) and there is black tape from the western Pacific rim. The two are totally different. The tape peeling and pulling back is a function of how its been treated. When its stret
/archives//html/TenTec/2009-05/msg00010.html (10,925 bytes)

17. Re: [TenTec] Argonaut II digital interfacing? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 08 May 2009 15:09:45 -0600
I believe the FT-817 has the same amp interface as the FT-857. The interface on the FT-857 has 4 bit digital binary data for band and a wire for PTT on an 8 pin mini din connector. I need to check fo
/archives//html/TenTec/2009-05/msg00047.html (9,404 bytes)

18. Re: [TenTec] Argonaut II digital interfacing? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 10 May 2009 01:50:32 -0600
with the FT-817. It uses logic to detect 26 to 28 MHz drive and so to lock out use on CB. Which ought to mean it could detect drive and bandswitch itself, but apparently it requires using the front p
/archives//html/TenTec/2009-05/msg00057.html (9,702 bytes)

19. Re: [TenTec] OMNI D (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 12 May 2009 07:29:17 -0600
Generally Tentecs always transmit with the basic 9 MHz SSB filter. If you change that one from the stock filter, you will change the transmit audio bandpass. 73, Jerry, K0CQ
/archives//html/TenTec/2009-05/msg00062.html (8,485 bytes)

20. Re: [TenTec] Corsair II low receive (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 17 May 2009 12:01:21 -0600
D1 and D2 on the LPF-TR board 80869. My book doesn't have the parts list, does any? Also check Q2, a 2N6514. a transistor used to shunt the receive signal, driven by +T. 73, Jerry, K0CQ
/archives//html/TenTec/2009-05/msg00155.html (8,574 bytes)

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