- 141. Re: [TenTec] Orion II - Tech Topics (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Tue, 08 Aug 2006 10:37:25 -0500
- Yes, it works, so long as you don't mind not having any real selectivity until after it, and don't mind the extra mixer noise and limited dynamic range because if you put selectivity in that first IF
- /archives//html/TenTec/2006-08/msg00334.html (9,118 bytes)
- 142. Re: [TenTec] ALL CAPS? (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Tue, 08 Aug 2006 12:27:46 -0500
- Actually there was a 6 bit code called TTS that did include case but could be printed on a Baudot printer as all upper case. In Baudot the most significant bit is sent first, but the added bit in TTS
- /archives//html/TenTec/2006-08/msg00347.html (11,936 bytes)
- 143. Re: [TenTec] ALL CAPS? (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Tue, 08 Aug 2006 15:23:56 -0500
- It doesn't any more than ALL CAPs thread does, but it give more insight into ALL CAPs vs upper/lower case in teletype and wire circuits. Most of which happened when Al was a kid. -- 73, Jerry, K0CQ,
- /archives//html/TenTec/2006-08/msg00361.html (8,485 bytes)
- 144. Re: [TenTec] ALL CAPS? (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Tue, 08 Aug 2006 15:31:40 -0500
- --... -...- -.--.- -- 73, Jerry, K0CQ, All content copyright Dr. Gerald N. Johnson, electrical engineer _______________________________________________ TenTec mailing list TenTec@contesting.com http:
- /archives//html/TenTec/2006-08/msg00362.html (8,707 bytes)
- 145. Re: [TenTec] Orion II - Tech Topics (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Tue, 08 Aug 2006 15:34:40 -0500
- The improved reference phase will probably be masked by the PLL phase noise anyway. My local standard does a part in 100 million per week, and order of magnitude better short term, and its been doing
- /archives//html/TenTec/2006-08/msg00363.html (9,989 bytes)
- 146. Re: [TenTec] Orion II - Tech Topics (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Tue, 08 Aug 2006 15:37:59 -0500
- I did 1 part per million once with a 75S-3B on 40 meters in an FMT. That was with 1 KHz dial divisions. Now at VHF and microwave I find most rigs are precisely inaccurate and so don't run a 50 Hz fil
- /archives//html/TenTec/2006-08/msg00364.html (9,831 bytes)
- 147. Re: [TenTec] Orion II - Tech Topics (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Tue, 08 Aug 2006 15:41:42 -0500
- Are you SURE its not your ear that's tuning 20 Hz off. Have you analyzed the bass voice harmonics to be certain they come out of your speaker at 3 x the fundamental, not 3 x +/- 20 Hz? Nope. The 2m m
- /archives//html/TenTec/2006-08/msg00365.html (9,902 bytes)
- 148. Re: [TenTec] Orion II - Tech Topics (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Tue, 08 Aug 2006 15:42:45 -0500
- So cover the last three digits with black tape. Or adjust the software to read only to the nearest KHz. -- 73, Jerry, K0CQ, All content copyright Dr. Gerald N. Johnson, electrical engineer __________
- /archives//html/TenTec/2006-08/msg00366.html (9,106 bytes)
- 149. Re: [TenTec] Orion II - Tech Topics (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Tue, 08 Aug 2006 16:18:19 -0500
- But all current amateur practice is the hetrodyning transverter with multipliers only in the LO stages, using an HF or VHF transceiver for IF and for transmit signal. That way it works for all modes
- /archives//html/TenTec/2006-08/msg00370.html (11,674 bytes)
- 150. Re: [TenTec] Yep -- Omni VII (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Sat, 12 Aug 2006 09:10:16 -0500
- Though there might be. The broad front ends can be prone to 2nd order intermod that the tuned front ends don't show. Tuning the SW BC bands there are stations elbow to elbow and sometimes overlapping
- /archives//html/TenTec/2006-08/msg00435.html (11,826 bytes)
- 151. Re: [TenTec] Paragon II and SWR meter reading (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Tue, 15 Aug 2006 13:54:28 -0500
- Cascading SWR meters is a lot like carrying two watches. With one you could be sure of the time or the reading, but two are never going to agree. Each SWR meter shows what it sees at its output. But
- /archives//html/TenTec/2006-08/msg00477.html (10,692 bytes)
- 152. Re: [TenTec] Want to buy = small audio amp (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Tue, 15 Aug 2006 13:59:45 -0500
- Radio shack used to sell a speaker with amplifier built in that might do the purpose. As I recall it had an LM-386 IC and ran on 9 volts. I stashed one on my test equipment shelf to use for an audio
- /archives//html/TenTec/2006-08/msg00478.html (8,130 bytes)
- 153. Re: [TenTec] Thanks for help with small amplifier (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Tue, 15 Aug 2006 14:15:21 -0500
- But most ham receivers have more than a watt of output already. Perhaps you need a lower impedance speaker to get more power, like 4 ohms instead of 16 ohms, or a speaker autotransformer which might
- /archives//html/TenTec/2006-08/msg00479.html (8,240 bytes)
- 154. Re: [TenTec] Orion II - Tech Topics (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Tue, 15 Aug 2006 14:29:02 -0500
- The one place a ham might need better proven accuracy and stability is in MARS and CAP programs that now demand the volunteer's equipment meet current excessively tight federal standards where a 20 H
- /archives//html/TenTec/2006-08/msg00480.html (13,732 bytes)
- 155. Re: [TenTec] Argosy I "Thump" (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Wed, 16 Aug 2006 10:19:03 -0500
- The fundamental cause of thump in analogue Tentec radios is that the AGC is derived from audio sometimes after some audio filtration. In any case the audio wave rises more slowly than the IF wave and
- /archives//html/TenTec/2006-08/msg00488.html (8,099 bytes)
- 156. Re: [TenTec] Argosy I "Thump" (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Wed, 16 Aug 2006 20:28:11 -0500
- Backing off on the RF gain (not the IF gain) can minimize the excess signal power stored in the filter to make the thump. At least that works in my Corsair II. You need to keep enough gain to handle
- /archives//html/TenTec/2006-08/msg00498.html (8,885 bytes)
- 157. Re: [TenTec] "End of an Era" (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Thu, 17 Aug 2006 21:06:16 -0500
- Actually the Collins A line did that to those other makers, the S-line just made Collins rigs almost affordable. Collins already offers such a receiver. Has for several years, covers DC to a few GHz.
- /archives//html/TenTec/2006-08/msg00525.html (9,305 bytes)
- 158. Re: [TenTec] Argosy I "Thump" (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Fri, 18 Aug 2006 12:37:06 -0500
- Sure an attenuator will work. It isn't as conveniently variable, but with the typical TenTec provisions for a separate receive antenna, and external antenna relay could allow the relay to be outside
- /archives//html/TenTec/2006-08/msg00539.html (9,296 bytes)
- 159. Re: [TenTec] "End of an Era" (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Sat, 19 Aug 2006 09:55:39 -0500
- Its kind of hard to run a mouse driven radio when you can't SEE the screen because of loss of vision or loss of monitor. But the less fortunate can feel their way around the knobs on an analog radio.
- /archives//html/TenTec/2006-08/msg00573.html (8,167 bytes)
- 160. Re: [TenTec] "End of an Era" (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Sat, 19 Aug 2006 12:16:54 -0500
- But, if like my dad K0CPN (now silent key), the ham isn't computer conversant the computer isn't a helper. Its a road block. And can that screen reading program handle the complex graphics of the sim
- /archives//html/TenTec/2006-08/msg00579.html (9,356 bytes)
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