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1. [AMPS] Tetrode Amp articles needed (score: 1): Author: paul1@wizard.ucs.sfu.ca (Paul Erickson); Date: Tue, 3 Jun 97 22:55:11 PDT; Can anyone help me with copies of the following articles. I'm having trouble finding them locally. cheers, Paul VE7CQK email: paul1@wizard.ucs.sfu.ca -- FAQ on WWW: http://www.contesting.com/ampfaq.h; /archives//html/Amps/1997-06/msg00007.html (8,784 bytes)
2. [AMPS] Tetrode Amp articles needed (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 4 Jun 97 07:33:35 -0700; ...snip... ...snip... This is an article I missed, Paul. However, the article should be interesting because the grid's DC bias voltage in a Class AB1 amplifier is normally adjusted so that, with ful; /archives//html/Amps/1997-06/msg00008.html (9,507 bytes)
3. [AMPS] Tetrode Amp articles needed (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Wed, 4 Jun 1997 22:13:58 +0000; That's not necessarily correct data. Exciter's power capabilities as well as the PA's grid circuit efficiency varies from band to band, plus someone is likely to eventually connect a different radio; /archives//html/Amps/1997-06/msg00011.html (10,379 bytes)
4. [AMPS] Tetrode Amp articles needed (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 5 Jun 1997 07:24:43 +0100; Very true - but how much of this is due to the tube characteristics, and how much to the power supply? Many power supplies designed for AB1 have very high output impedances (several K or more), so th; /archives//html/Amps/1997-06/msg00014.html (9,845 bytes)
5. [AMPS] Tetrode Amp articles needed (score: 1): Author: measures@vc.net (Rich Measures); Date: Thu, 5 Jun 97 02:10:50 -0700; True This is why the first tuneup step is to adjust the grid bias V so that the grid is drawing ZERO grid current with maximum drive applied. This happens before the anode and screen voltages are ap; /archives//html/Amps/1997-06/msg00016.html (10,737 bytes)
6. [AMPS] Tetrode Amp articles needed (score: 1): Author: W6TG@aol.com (W6TG@aol.com); Date: Thu, 5 Jun 1997 13:24:16 -0400 (EDT); << In the practical world, ALC is actually MORE necessary in a class AB1 PA. The slightest grid current will send the PA into distortion quickly with most AB1 grid driven designs. The correct way to; /archives//html/Amps/1997-06/msg00019.html (9,372 bytes)
7. [AMPS] Tetrode Amp articles needed (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Thu, 5 Jun 1997 14:03:11 +0000; Hi Ian, Absolutely correct. If the PA was built like an AB2 PA, even though operated AB1, problems would be greatly reduced. Unfortunately MANY published designs use a high value grid source resistan; /archives//html/Amps/1997-06/msg00021.html (11,965 bytes)
8. [AMPS] Tetrode Amp articles needed (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Thu, 5 Jun 1997 15:34:13 +0000; Hi Terry, I would too, if it worked properly. Unfortunately, those controls more often than not allow the exciter to overshoot on leading edges. I've measured ICOMs that produce 300 watts PEP when se; /archives//html/Amps/1997-06/msg00026.html (9,574 bytes)
9. [AMPS] Tetrode Amp articles needed (score: 1): Author: measures@vc.net (Rich Measures); Date: Thu, 5 Jun 97 14:40:51 -0700; Would it not be simpler to adjust the bias voltage a bit higher than minus 50v, so that the grid can't draw distortion-producing grid current, and then increase the screen V until the ZSAC increases; /archives//html/Amps/1997-06/msg00032.html (9,669 bytes)
10. [AMPS] Tetrode Amp articles needed (score: 1): Author: measures@vc.net (Rich Measures); Date: Thu, 5 Jun 97 14:40:56 -0700; True indeed, Mr. Rauch. I have seen 170 overshoot watts out of some transceivers even though the power is adjusted to 100w, key down on cw. It seems to me that the simplist solution is to adjust the; /archives//html/Amps/1997-06/msg00034.html (9,168 bytes)
11. [AMPS] Tetrode Amp articles needed (score: 1): Author: W6TG@aol.com (W6TG@aol.com); Date: Thu, 5 Jun 1997 20:16:14 -0400 (EDT); << Hi Terry, << I would too, if it worked properly. Unfortunately, those controls << more often than not allow the exciter to overshoot on leading edges. So a external ALC circuit such as one in a AB; /archives//html/Amps/1997-06/msg00037.html (9,806 bytes)
12. [AMPS] Tetrode Amp articles needed (score: 1): Author: no2tj@cybernex.net (Jerry NO2T); Date: Thu, 05 Jun 1997 21:36:41 -0400; Hi to all The answer to the initial power spike is a fixed ALC into the transceiver. Using a fixed voltage the time constant in the rig no longer determines the initial high power spike. Combining th; /archives//html/Amps/1997-06/msg00039.html (8,614 bytes)
13. [AMPS] Tetrode Amp articles needed (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Fri, 6 Jun 1997 08:57:03 +0000; That's a good suggestion Jerry. In tests here, that has corrected the problem. Thank's for mentioning it. 73, Tom W8JI -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesti; /archives//html/Amps/1997-06/msg00046.html (8,860 bytes)
14. [AMPS] Tetrode Amp articles needed (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Fri, 6 Jun 1997 08:57:03 +0000; If you read my post again, you'll see I said an ALC system with a SLOW decay will help this problem. You might get one occasional leading edge overshoot, but the overshoots caused by brief pauses wi; /archives//html/Amps/1997-06/msg00048.html (10,476 bytes)
15. [AMPS] Tetrode Amp articles needed (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Fri, 06 Jun 1997 10:21:06 EDT; I am not even sure if the typical VHF multimode xcvr has any provision for ALC input; perhaps Ian would have that info. The inclusion of ALC circuits in various VHF oriented publications would be a s; /archives//html/Amps/1997-06/msg00051.html (10,366 bytes)
16. [AMPS] Tetrode Amp articles needed (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Fri, 6 Jun 1997 17:27:42 +0100; With the correct drive levels and power supplies, 4CX250, 4CX350 and probably 4CX400 amplifiers can give excellent-quality signals. A lot of work was done on this in Europe 10-15 years ago. At that t; /archives//html/Amps/1997-06/msg00059.html (10,986 bytes)

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