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1. Re: [TenTec] Speaking of Headphones (Orion) (score: 1)
Author: "geraldj" <geraldj@storm.weather.net>
Date: Thu, 16 Mar 2006 10:14:58 -0600
A 600 ohm load on a circuit made for 16 to 32 ohm loads won't damage anything. Back in the tube days, it might have but not with solid state output stages. It might lead to greater distortion from ha
/archives//html/TenTec/2006-03/msg00776.html (9,961 bytes)

2. Re: [TenTec] Further Orion Sub Receiver (score: 1)
Author: "geraldj" <geraldj@storm.weather.net>
Date: Fri, 17 Mar 2006 16:43:49 -0600
When the detector is seeing a volt or two of signal, its way above the square law region. -- 73, Jerry, K0CQ, All content copyright Dr. Gerald N. Johnson, electrical engineer ________________________
/archives//html/TenTec/2006-03/msg00860.html (9,719 bytes)

3. Re: [TenTec] RF Getting back into Rig Problem (score: 1)
Author: "geraldj" <geraldj@storm.weather.net>
Date: Mon, 20 Mar 2006 11:55:25 -0600
Off center fed antennas are particularly poor about putting RF down the outside of the coax. That's because the two halves of the antenna being different lengths are coupled to the feed line unequall
/archives//html/TenTec/2006-03/msg00948.html (8,139 bytes)

4. Re: [TenTec] Pegasus mic input is Hi-Z, unbalanced! (score: 1)
Author: "geraldj" <geraldj@storm.weather.net>
Date: Tue, 21 Mar 2006 14:55:56 -0600
10K is NOT HIGH impedance. Its moderate impedance at the best. 1 MEG is HIGH impedance. Some vintage Kenwoods take 50K as "high" impedance. So long as the NOISE of the audio stages and the gain of th
/archives//html/TenTec/2006-03/msg00970.html (8,788 bytes)

5. Re: [TenTec] Questions about NR i.e. Orion (score: 1)
Author: "geraldj" <geraldj@storm.weather.net>
Date: Wed, 22 Mar 2006 13:45:17 -0600
<SNIP> NOT AT ALL! All the good NR techniques use the high correlation of a desired signal and the relative lack of correlation of noise to discriminate between the two. At least that's what the book
/archives//html/TenTec/2006-03/msg01003.html (11,824 bytes)

6. Re: [TenTec] Questions about NR i.e. Orion (score: 1)
Author: "geraldj" <geraldj@storm.weather.net>
Date: Fri, 24 Mar 2006 02:42:14 -0600
as the sole means of improving the ability to recover information from noise. I feel this misses the point that I am exploring. In his 1948 landmark paper, Claude Shannon extends the work of Nyquist
/archives//html/TenTec/2006-03/msg01053.html (10,811 bytes)

7. Re: [TenTec] Questions about NR i.e. Orion (score: 1)
Author: "geraldj" <geraldj@storm.weather.net>
Date: Sat, 25 Mar 2006 10:38:50 -0600
will take at least 5 times the speed of a square cornered filter and a Bessel will do better than that. The DSP filters in common use do far better than similar analog filters because the DSP filters
/archives//html/TenTec/2006-03/msg01093.html (10,521 bytes)

8. Re: [TenTec] Corsair II problem question? (score: 1)
Author: "geraldj" <geraldj@storm.weather.net>
Date: Sat, 25 Mar 2006 19:21:00 -0600
Sounds like a typical dirty switch contact or connector problem in a vintage radio. Each contact on the mode switch needs a quarter drop of DeoxIT from a Cramolin dropper bottle. Not a spray, a contr
/archives//html/TenTec/2006-03/msg01111.html (8,168 bytes)

9. Re: [TenTec] Questions about NR i.e. Orion (score: 1)
Author: "geraldj" <geraldj@storm.weather.net>
Date: Sun, 26 Mar 2006 09:54:38 -0600
Not quite what I said. The Bessel filter will pass the components of that 200 Hz signal that fit in its pass band without adding the artifacts of ringing. And that Bessel filter will pass most of tha
/archives//html/TenTec/2006-03/msg01134.html (10,149 bytes)

10. Re: [TenTec] Corsair Questions (score: 1)
Author: "geraldj" <geraldj@storm.weather.net>
Date: Sun, 26 Mar 2006 09:55:58 -0600
They are about and for sale on occasion. I have one I'm working on getting ready to sell. A Corsair II with CW filter. The Corsair II uses Ulrich Rohde's favorite transformer (Anzac) circuit for RF s
/archives//html/TenTec/2006-03/msg01135.html (10,097 bytes)

11. Re: [TenTec] Problem with Triton IV receive (score: 1)
Author: "geraldj" <geraldj@storm.weather.net>
Date: Sun, 26 Mar 2006 10:02:36 -0600
the > same and s meter reading is the same as the good Triton, but receive is way down from > > the good one. Suggestions on where to start? Also the block diagram is missing from my > manual.- Danny
/archives//html/TenTec/2006-03/msg01138.html (7,442 bytes)

12. Re: [TenTec] Corsair dying on TX- help, hints, please (score: 1)
Author: "geraldj" <geraldj@storm.weather.net>
Date: Mon, 27 Mar 2006 17:21:30 -0600
checking the board mounting screws and grounding. Tighten them. Screws through a PCB loose their pressure over time because the plastic relieves the applied pressure and the shock and vibration of sh
/archives//html/TenTec/2006-03/msg01223.html (9,380 bytes)

13. Re: [TenTec] RF choke across Pegasus input? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Thu, 30 Mar 2006 20:49:40 -0600
Actually 100 uh at 4 MHz is only 2K. On a 50K input it could cut some RF and enhance RF where the input C resonated the choke. On the other hand that choke surely has a series resonance and would be
/archives//html/TenTec/2006-03/msg01322.html (9,186 bytes)

14. Re: [TenTec] battery life (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 31 Mar 2006 10:47:17 -0600
For good battery life as a regulator the power supply needs to have more precise regulation than running alone, though it can have a significantly lower current capability than running the radio alon
/archives//html/TenTec/2006-03/msg01343.html (9,680 bytes)

15. Re: [TenTec] Orion II AT tuner question (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 31 Mar 2006 21:14:33 -0600
-- 73, Jerry, K0CQ, All content copyright Dr. Gerald N. Johnson, electrical engineer _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.
/archives//html/TenTec/2006-03/msg01386.html (9,966 bytes)

16. Re: [TenTec] Orion II AT tuner question (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 31 Mar 2006 21:55:10 -0600
There are cases where a matched antenna is a benefit, where the receiver noise isn't so good. Most users of 10m antennas already build them pretty well matched, because matching at the transmitter en
/archives//html/TenTec/2006-03/msg01390.html (10,394 bytes)

17. Re: [TenTec] Orion II AT tuner question (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sat, 01 Apr 2006 08:51:20 -0600
Some receivers have no attenuator. Those that do have only one. Under some condition that can be too much attenuation and under other conditions not enough. And sometimes the attenuation is more than
/archives//html/TenTec/2006-04/msg00007.html (11,971 bytes)

18. Re: [TenTec] Problem: Please confirm Orion II Radios (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 04 Apr 2006 08:37:28 -0500
More likely Windoze CE if one would believe the Microsoft one page flier I received yesterday proposing it for embedded systems. -- 73, Jerry, K0CQ, All content copyright Dr. Gerald N. Johnson, elect
/archives//html/TenTec/2006-04/msg00121.html (10,337 bytes)

19. Re: [TenTec] The Bug (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 05 Apr 2006 10:26:30 -0500
The measured RED curve is how a COMMUNICATIONS radio should roll off. Those broadcast rumbling basso profundo fundamentals don't help communications a bit and waste a lot of the available peak output
/archives//html/TenTec/2006-04/msg00174.html (9,473 bytes)

20. Re: [TenTec] The Bug (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 05 Apr 2006 11:05:35 -0500
If the mic gain in the radio isn't AT the connector but is after a stage or two of audio, that first stage can be easily over driven by the external equalizer leading to distorted audio that radio se
/archives//html/TenTec/2006-04/msg00180.html (10,807 bytes)

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