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1. [AMPS] Feedback path 3-500Z (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 2 Oct 2000 07:14:18 +0100; Not everyone, Tom. 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesti; /archives//html/Amps/2000-10/msg00013.html (7,632 bytes)
2. [AMPS] Feedback path 3-500Z (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 2 Oct 2000 07:35:18 +0100; How does one see that on a spectrum analyser? Because it's not a continuous signal in the time domain, it's not the thing to look for with a spectrum analyser. Remember too, that a spectrum analyser,; /archives//html/Amps/2000-10/msg00016.html (8,084 bytes)
3. [AMPS] Feedback path 3-500Z (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 2 Oct 2000 07:46:42 -0400; Peter replied: People who haven't thought clearly about what a spectrum analyzer does often misuse or misinterpret them. If you read the "information" on the spectrum analyzer "proof", you'll see du; /archives//html/Amps/2000-10/msg00024.html (8,992 bytes)
4. [AMPS] Feedback path 3-500Z (score: 1): Author: 2@vc.net (measures); Date: Mon, 2 Oct 2000 04:59:21 -0700; With an approx. 30pps tuning pulser, one sees a virtually continuous signal. Only turkeys look for damped wave ringing without pulsing the anode current. . end - Rich..., 805.386.3734, www.vcnet.com; /archives//html/Amps/2000-10/msg00028.html (8,415 bytes)
5. [AMPS] Feedback path 3-500Z (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 2 Oct 2000 13:00:09 +0100; So what spec an settings were used (dispersion, bandwidth, sweep time etc?) 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests:; /archives//html/Amps/2000-10/msg00030.html (8,283 bytes)
6. [AMPS] Feedback path 3-500Z (score: 1): Author: Uwe.Egen@t-online.de (Uwe Egen); Date: Mon, 2 Oct 2000 14:03:34 +0200; Peter Chadwick schrieb: Hi Peter, I have seen c. 120 MHz ringing at my own home made project. Yes, the spectrum analyzer does not look all time at 120 MHz. The analyzer is mostly free running but som; /archives//html/Amps/2000-10/msg00031.html (9,324 bytes)
7. [AMPS] Feedback path 3-500Z (score: 1): Author: 2@vc.net (measures); Date: Mon, 2 Oct 2000 05:11:25 -0700; No one reportedly saw such blips. They saw damped wave ringing -- not regeneration. end - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submiss; /archives//html/Amps/2000-10/msg00032.html (9,087 bytes)
8. [AMPS] Feedback path 3-500Z (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 2 Oct 2000 13:12:43 +0100; How do you know with a frequency domain instrument that it is damped ringing? Wouldn't an oscilloscope (maybe with a high pass filter to get rid of fundamental overload be the correct instrument to u; /archives//html/Amps/2000-10/msg00033.html (8,488 bytes)
9. [AMPS] Feedback path 3-500Z (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 2 Oct 2000 13:17:41 +0100; I've never found ringing. I have found a 'parasitic' resonance which accentuated a harmonic, although the PA in question didn't oscillate. But pulsing wasn't necessary to find that. I guess if one pu; /archives//html/Amps/2000-10/msg00034.html (8,645 bytes)
10. [AMPS] Feedback path 3-500Z (score: 1): Author: Uwe.Egen@t-online.de (Uwe Egen); Date: Mon, 2 Oct 2000 14:39:20 +0200; Peter Chadwick schrieb: Peter, agree with you. My term (scope reading) means oscilloscope voltage reading of course. On every leading edge you could see changings in intensity. The measurement status; /archives//html/Amps/2000-10/msg00035.html (9,187 bytes)
11. [AMPS] Feedback path 3-500Z (score: 1): Author: 2@vc.net (measures); Date: Mon, 2 Oct 2000 07:27:19 -0700; I have no idea what ''spec'' means. end - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative request; /archives//html/Amps/2000-10/msg00038.html (8,161 bytes)
12. [AMPS] Feedback path 3-500Z (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 2 Oct 2000 15:26:04 +0100; 'spec an' - industry standard abbreviation for 'spectrum analyser' 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQU; /archives//html/Amps/2000-10/msg00039.html (8,280 bytes)
13. [AMPS] Feedback path 3-500Z (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 2 Oct 2000 12:07:59 -0400; Spectrum analyzers do not display "wave ringing". Oscilloscopes do. Ringing is not necessarily an indication of an oscillation. 73, Tom W8JI w8ji@contesting.com -- FAQ on WWW: http://www.contesting.; /archives//html/Amps/2000-10/msg00048.html (8,673 bytes)
14. [AMPS] Feedback path 3-500Z (score: 1): Author: 2@vc.net (measures); Date: Mon, 2 Oct 2000 10:38:09 -0700; This is what was reportedly done. end - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests:; /archives//html/Amps/2000-10/msg00053.html (8,261 bytes)
15. [AMPS] Feedback path 3-500Z (score: 1): Author: 2@vc.net (measures); Date: Mon, 2 Oct 2000 10:54:25 -0700; There was No oscillation in the amplifier. Pulsed DC and a tuned circuit produced RF - the same way that spark transmitters produced RF. cheers, Tom - Rich..., 805.386.3734, www.vcnet.com/measures.; /archives//html/Amps/2000-10/msg00054.html (8,396 bytes)
16. [AMPS] Feedback path 3-500Z (score: 1): Author: gm3woj@talk21.com (Chris Tran GM3WOJ); Date: Mon, 2 Oct 2000 18:28:26 +0100; Rich writes :- There was No oscillation in the amplifier. Pulsed DC and a tuned circuit produced RF - the same way that spark transmitters produced RF. My spark TX theory is a bit rusty, but surely t; /archives//html/Amps/2000-10/msg00055.html (8,169 bytes)
17. [AMPS] Feedback path 3-500Z (score: 1): Author: 2@vc.net (measures); Date: Mon, 2 Oct 2000 18:06:23 -0700; There was no oscillation in the tube. cheers, Chris - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administra; /archives//html/Amps/2000-10/msg00060.html (7,932 bytes)
18. [AMPS] Feedback path 3-500Z (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 28 Sep 2000 07:44:53 -0400; The G-P capacitance of a 3-500Z is about 5 pF, not .07pF. Rich's feedback reactance was off by a factor of about 71, and tiny but not insignificant error. The correct G-P reactance at a couple hundre; /archives//html/Amps/2000-09/msg01148.html (7,742 bytes)
19. [AMPS] Feedback path 3-500Z (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 28 Sep 2000 13:07:06 +0100; Does the SB220 have more than one choke in the plate - the usual shunt feed choke to the plate, and on the HV side of that choke, another one, in series to the HV?, with a bypass from the junction to; /archives//html/Amps/2000-09/msg01149.html (8,066 bytes)
20. [AMPS] Feedback path 3-500Z (score: 1): Author: wc6w@juno.com (Radio WC6W); Date: Thu, 28 Sep 2000 11:13:18 EDT; Yes, the second choke is 8.5 uH; And it is bypassed at the supply end with .001 uF. Yes, .001uF there too. 50 uH 73, Marv WC6W * ________________________________________________________________ YOU'R; /archives//html/Amps/2000-09/msg01151.html (8,652 bytes)

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