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221. [AMPS] Rain Static (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 28 Sep 2001 10:27:30 -0400; Rain static, or what is called precipitation static, is almost always from corona discharge. This is the noise that sounds like a whining or musical hissing noise. It is generally NOT a charge "stor; /archives//html/Amps/2001-09/msg00463.html (7,975 bytes)
222. [AMPS] Noises in electrolytic capacitors (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 28 Sep 2001 10:27:30 -0400; Just don't fall into the trap that one person does, and say that all high-power bleeders or equalizers are "bad" and replace them. The resistor does not make the capacitor heat up, unless the ventil; /archives//html/Amps/2001-09/msg00464.html (9,970 bytes)
223. [AMPS] Plate Choke test with MFJ-259B (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 28 Sep 2001 10:27:30 -0400; Leave it in the final position with the bottom connected, and disconnect the top from the circuit and test it at that point using short leads to the 259B. Be sure to set the tank circuit to various; /archives//html/Amps/2001-09/msg00465.html (7,713 bytes)
224. [AMPS] coax connector ratings (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 28 Sep 2001 10:27:30 -0400; N and UHF connectors vary widely, depending on installation and manufacturer. For example at 30 MHz , a few UHF connectors will fail at 2000 watts (Radio Shack connectors for example) and quite a fe; /archives//html/Amps/2001-09/msg00466.html (8,988 bytes)
225. [AMPS] Noises in electrolytic capacitors (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 28 Sep 2001 14:33:06 -0400; expect on SSB. It comes up because someone has been driven into saturation, and distorts everything he reads or hears when he amplifys it. ;-) The manuals specifically state exactly what you say Vic; /archives//html/Amps/2001-09/msg00473.html (9,430 bytes)
226. [AMPS] 3-500Z (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 28 Sep 2001 20:44:29 -0400; Neither. It is a typical operating parameter based on a certain ratio of peak to average current. As long as IMD is OK, you are OK. Unlike MOX cathode tubes, thoriated tungsten tubes are NOT damaged; /archives//html/Amps/2001-09/msg00501.html (8,516 bytes)
227. [AMPS] Re: The 3-500Z, having been officially beaten to death... (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 28 Sep 2001 20:44:29 -0400; When the AL80A and later models were designed, seal and envelope temperatures were measured at full rated power. In all cases, all seals are well below ratings. That is contrary to some 3-500 amps,; /archives//html/Amps/2001-09/msg00502.html (8,714 bytes)
228. [AMPS] RE: 3-500z cooling (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sat, 29 Sep 2001 05:44:50 -0400; respectfully Phil, the correct way to do it is any way that maintains the envelope and seals below rated temperature. How you do it does not matter. Not so. Air flow is air flow. It takes a much lar; /archives//html/Amps/2001-09/msg00514.html (8,450 bytes)
229. [AMPS] Re: The 3-500Z, having been officially beaten to death... (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sat, 29 Sep 2001 19:18:22 -0400; The SB1000 was a clone of the AL80A. The original AL80 was designed in Twinsburg Ohio by other people who eventually had Amp Supply. It is totally different than the AL80A. Prime Instruments owned a; /archives//html/Amps/2001-09/msg00528.html (10,108 bytes)
230. [AMPS] FT100D driving Alpha 87a (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 1 Aug 2001 05:25:46 -0400; Actually that system would depend on leading edge response time of the ALC. A better system would decode band data and set fixed negative bias for each band. That bias would get within ten dB or so; /archives//html/Amps/2001-08/msg00001.html (10,200 bytes)
231. [AMPS] FT100D driving Alpha 87a (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 1 Aug 2001 13:26:40 -0400; I must have missed the post where you said the pots would be set to apply a fixed negative bias, and the ALC voltage summed to that voltage. It is very important to do that with the bias. I read it; /archives//html/Amps/2001-08/msg00006.html (9,005 bytes)
232. [AMPS] Transceivers (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 2 Aug 2001 11:49:06 -0400; That's true. Neither the RSGB or the ARRL pointed out how unacceptable transmitter (and receiver) performance is in that radio. But we are making progress, the ARRL is now including closespaced bloc; /archives//html/Amps/2001-08/msg00015.html (9,644 bytes)
233. [AMPS] TS-2000 (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 3 Aug 2001 10:17:54 -0400; Hi Peter, I've measured solid state zero-bias transistor amps at about the same IMD level as the TS-2000. I wonder what they did wrong? It would be interesting to look at one on a three-tone test, an; /archives//html/Amps/2001-08/msg00030.html (11,685 bytes)
234. [AMPS] RE: TS-2000 (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 3 Aug 2001 14:48:20 -0400; You are talking about on-frequency sound, and I am talking about clicks up and down the band. Newer engineers have little grasp of analog systems, and virtually no understanding of things like bias; /archives//html/Amps/2001-08/msg00034.html (8,132 bytes)
235. [AMPS] TS-2000 (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 3 Aug 2001 14:48:20 -0400; Hi Paul, If the goal is to copy the signal as best as possible at the highest speed possible while not disturbing others, then the ARRL's waveform is certainly not ideal. It is the product of cheap c; /archives//html/Amps/2001-08/msg00035.html (13,136 bytes)
236. [AMPS] TS-2000 (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 3 Aug 2001 19:53:43 -0400; Hi Paul, I don't understand what you mean by "bell like". Do you mean the shape or the sound? If you mean shape, that shape is not optimum for bandwidth. What you hear is entirely different anyway, u; /archives//html/Amps/2001-08/msg00041.html (12,976 bytes)
237. [AMPS] Kenwood ts2000 driving a G2DAF amp (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 3 Aug 2001 19:53:43 -0400; The ARRL and the RSGB both came up with almost identical numbers. As I recall, only one radio is history was worse than the TS2000 on transmit, and the receiver isn't that good either. QST publishes; /archives//html/Amps/2001-08/msg00042.html (9,161 bytes)
238. [AMPS] Linear AMP timing (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 7 Aug 2001 02:32:15 -0400; 2 milliseconds is enough, as long as it is always there and the contacts don't bounce that long.Most relays are done bouncing within 1 ms. Be sure it opens AFTER the input relays opens also! 73, Tom; /archives//html/Amps/2001-08/msg00075.html (8,014 bytes)
239. [AMPS] Linear AMP timing (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 7 Aug 2001 12:35:11 -0400; Of course it never hurts to measure an unknown, but virtually all relays useful in amplifiers take far less than 20ms to switch. Typical open frame 20 ampere relays switch in 12 mS or less. The only; /archives//html/Amps/2001-08/msg00081.html (9,498 bytes)
240. [AMPS] Linear AMP timing (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 9 Aug 2001 12:36:42 -0400; Bill, What actually will happen ios the tube becomes a dc cathode follower, and the cathode voltage easily pumps up a bit higher than you might expect. Then the relay has to discharge any capacitors; /archives//html/Amps/2001-08/msg00112.html (9,200 bytes)

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