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1. [AMPS] Hand in the pocket? (score: 1): Author: ws7l@arrl.net (Carl Clawson); Date: Fri, 12 Oct 2001 21:32:42 -0700; We've again recently heard the old rule about keeping one hand in a pocket when working on electronics. I've heard it so many times over so many years that I'm beginning to wonder if it's even true.; /archives//html/Amps/2001-10/msg00316.html (6,909 bytes)
2. [AMPS] DC Output (score: 1): Author: Carl Clawson" <ws7l@arrl.net (Carl Clawson); Date: Tue, 1 Aug 2000 20:29:20 -0700; 0.5 confused Several answers on the list gave useful information about transformer duty cycles, but didn't answer the question that I thought was being asked. So here goes... The apparent extra powe; /archives//html/Amps/2000-08/msg00013.html (8,206 bytes)
3. [AMPS] High Voltage Connectors? (score: 1): Author: Carl Clawson" <ws7l@arrl.net (Carl Clawson); Date: Thu, 20 Apr 2000 20:32:57 -0700; Try www.pasternack.com for them. They have the lowest prices I've seen, $12.00 for RG-58 or 59 clamp, and panel-mount jacks for as low as $10.00. For the ultimate in safety, consider "pigtailing" yo; /archives//html/Amps/2000-04/msg00116.html (8,541 bytes)
4. [AMPS] FAILURE OF PARASITIC RESISTORS IN AL-811X AMPLIFIER (score: 1): Author: Carl Clawson" <ws7l@arrl.net (Carl Clawson); Date: Fri, 3 Mar 2000 18:14:07 -0800; This is a misrepresentation, and I think you know it. The amp is in use, and drive, impedances, etc are changing from time to time. It's not just sitting there. The spurious oscillation hypothesis is; /archives//html/Amps/2000-03/msg00126.html (11,730 bytes)
5. [AMPS] Re: Poor science (score: 1): Author: Carl Clawson" <ws7l@arrl.net (Carl Clawson); Date: Sat, 4 Mar 2000 23:00:32 -0800; etc, etc, etc. Non sequitur. I said nothing about Rich's claims. My criticizing his critics doesn't mean that I'm defending him or agreeing with him. He doesn't need my help anyway. I reiterate: It; /archives//html/Amps/2000-03/msg00143.html (10,106 bytes)
6. [AMPS] Re: Poor science (score: 1): Author: Carl Clawson" <ws7l@arrl.net (Carl Clawson); Date: Sun, 5 Mar 2000 09:20:52 -0800; ... I'm sorry, but I didn't say that I could do that. I do not know enough about the dynamic behavior of tubes and tube amplifiers. When I learn more maybe I will have something interesting to say a; /archives//html/Amps/2000-03/msg00166.html (11,448 bytes)
7. [AMPS] Re: Poor science (score: 1): Author: Carl Clawson" <ws7l@arrl.net (Carl Clawson); Date: Sun, 5 Mar 2000 15:11:26 -0800; more not. Said statement did not pertain specifically to a tube amplifier. It was a statement of general physics, a subject that I _am_ familiar with. I've repeated it twice already and you haven't; /archives//html/Amps/2000-03/msg00192.html (11,861 bytes)
8. [AMPS] Re: Poor science (score: 1): Author: Carl Clawson" <ws7l@arrl.net (Carl Clawson); Date: Mon, 6 Mar 2000 19:56:51 -0800; Agreed, Tom. We're more in agreement than otherwise. My point is that, given sufficient excitation, a nonlinear system in general can exhibit a self-sustaining oscillation. The "sufficient excitatio; /archives//html/Amps/2000-03/msg00320.html (10,001 bytes)
9. [AMPS] FAILURE OF PARASITIC RESISTORS IN AL-811X AMPLIFIER (score: 1): Author: Carl Clawson" <ws7l@arrl.net (Carl Clawson); Date: Mon, 6 Mar 2000 20:00:09 -0800; Jon, that was a good summary. One point I've been ranting on about, though, is that the amplifier is a nonlinear system and as such one must be careful applying linear analysis to it. Concepts such; /archives//html/Amps/2000-03/msg00321.html (10,870 bytes)
10. [AMPS] Better science (score: 1): Author: Carl Clawson" <ws7l@arrl.net (Carl Clawson); Date: Mon, 6 Mar 2000 20:10:08 -0800; Back when I was in semiconductors, we used a circuit simulator called SPICE. It has enormous libraries of models for semiconductor components that you can plug in. You can use it to do both small-sig; /archives//html/Amps/2000-03/msg00324.html (7,077 bytes)
11. [AMPS] Re: Poor science (score: 1): Author: Carl Clawson" <ws7l@arrl.net (Carl Clawson); Date: Tue, 7 Mar 2000 22:31:30 -0800; I have my moments. Interesting thought. Agreed. I don't actually claim that chaos has anything to do with the problem. (I get carried away when I'm having fun.) And I freely admit that I have limite; /archives//html/Amps/2000-03/msg00430.html (9,517 bytes)
12. [AMPS] Re: Amp Stability (score: 1): Author: Carl Clawson" <ws7l@arrl.net (Carl Clawson); Date: Wed, 8 Mar 2000 05:46:04 -0800; Assuredly. I once traced an oscillation in a 28 MHz amp to RF coupling into the coil of the output relay, through the DC power leads to the coil of the input relay and thence to the input. I didn't; /archives//html/Amps/2000-03/msg00460.html (7,927 bytes)
13. [AMPS] Re: Mission Impossible (score: 1): Author: Carl Clawson" <ws7l@arrl.net (Carl Clawson); Date: Wed, 8 Mar 2000 18:43:47 -0800; I'll vouch for Tom's ears. He's one of the few ops east of the Mississippi who always copies my pitiful squeaks on 160 meters. Carl WS7L -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submiss; /archives//html/Amps/2000-03/msg00492.html (7,245 bytes)
14. [AMPS] Re: Power Handling of Resistors (score: 1): Author: Carl Clawson" <ws7l@arrl.net (Carl Clawson); Date: Thu, 9 Mar 2000 19:36:34 -0800; not It takes about 500 J to melt a gram of brass from room temperature. I think 256 would be enough to seriously damage a band switch. The unresolved problem isn't the available energy, it's how it; /archives//html/Amps/2000-03/msg00514.html (8,166 bytes)
15. [AMPS] Unconditional stability (score: 1): Author: Carl Clawson" <ws7l@arrl.net (Carl Clawson); Date: Thu, 9 Mar 2000 20:01:02 -0800; I've heard this phrase several times on the reflector in recent days. Could we please stop claiming that our amps are "unconditionally stable?" I suspect that few if any of us have ever measured the; /archives//html/Amps/2000-03/msg00515.html (7,529 bytes)
16. [AMPS] Unconditional stability (score: 1): Author: Carl Clawson" <ws7l@arrl.net (Carl Clawson); Date: Thu, 9 Mar 2000 21:03:25 -0800; Hoist by my own petard, as it were! Actually AB amps, thought of as "black boxes" with two ports, are as reasonably linear as any other amplifier, at least at the design frequency. It's the internal; /archives//html/Amps/2000-03/msg00520.html (7,629 bytes)
17. [AMPS] Re: Power Handling of Resistors (score: 1): Author: Carl Clawson" <ws7l@arrl.net (Carl Clawson); Date: Thu, 9 Mar 2000 21:36:51 -0800; through (or Passing 1500 watts through closed terminals of the band switch doesn't dissipate 1500 watts in the switch or it would shortly be toast. We hope the 1500 watts makes it to the antenna. Ac; /archives//html/Amps/2000-03/msg00521.html (10,285 bytes)
18. [AMPS] Re: Static discharge caused arcs (score: 1): Author: Carl Clawson" <ws7l@arrl.net (Carl Clawson); Date: Fri, 10 Mar 2000 22:43:03 -0800; it of address Interesting, Colin! What's happening isn't a sudden discharge from the sky to the antenna, but rather a slow buildup of charge that occurs when the antenna terminals are open I've alwa; /archives//html/Amps/2000-03/msg00564.html (10,405 bytes)
19. [AMPS] Re: Static discharge caused arcs (score: 1): Author: Carl Clawson" <ws7l@arrl.net (Carl Clawson); Date: Sat, 11 Mar 2000 07:49:39 -0800; of noise. You're right, and I think if you look at the antenna protectors sold by ICE or Polyphaser you'll see a choke to ground on the receiver side. The antenna side I think has a gas discharge tu; /archives//html/Amps/2000-03/msg00567.html (8,612 bytes)
20. [AMPS] Chokes (score: 1): Author: Carl Clawson" <ws7l@arrl.net (Carl Clawson); Date: Sat, 11 Mar 2000 16:24:14 -0800; Very good point, Tom. This requires a minuscule change in the load-C setting compared to a larger inductance. I hadn't thought much about this component before -- "everybody knows" you use a couple; /archives//html/Amps/2000-03/msg00582.html (8,320 bytes)

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