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201. [AMPS] IMD (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 18 Sep 2001 10:28:40 -0400; A three tone test, where two normally spaced tones are measured and modulated by a variation at a non-coherent syllabic rate, would be best. Remember the supplies are very much stabilized at frequen; /archives//html/Amps/2001-09/msg00314.html (8,723 bytes)
202. [AMPS] IMD (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 18 Sep 2001 14:39:17 -0400; Wide band noise does not test power supply dynamics. It is actually much less effective in that regard than a two-tone test. 73, Tom W8JI W8JI@contesting.com -- FAQ on WWW: http://www.contesting.com; /archives//html/Amps/2001-09/msg00328.html (8,550 bytes)
203. [AMPS] minimum distortion detectable (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 18 Sep 2001 14:57:22 -0400; There was some illusion that the goal is to put the IMD 40 dB down so it is the minimum detectable distortion to the human ear. That is not the problem. The problem is in an RFPA the distortion gener; /archives//html/Amps/2001-09/msg00331.html (7,861 bytes)
204. [AMPS] IMD (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 18 Sep 2001 21:59:34 -0400; No, and it won't work in that application Mike. I do use spectrum lab for receiver testing, but only to sort out the desired signal from filter blowby and other noises. 73, Tom W8JI W8JI@contesting.; /archives//html/Amps/2001-09/msg00335.html (8,632 bytes)
205. [AMPS] IMD (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 19 Sep 2001 09:01:06 -0400; Since you would be depending on the entire receiver, including detector and audio amplifiers and even the sound card, it would likely be very poor. I'd expect most systems to be in the 40dB IMDR or; /archives//html/Amps/2001-09/msg00342.html (10,489 bytes)
206. [AMPS] IMD (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 19 Sep 2001 09:01:06 -0400; Are you saying the wideband noise causes the power supplies to waddle around at a syllabic rate? So If we watch the HV meter, we will see it bouncing around? If it doesn't do that, just like speech; /archives//html/Amps/2001-09/msg00343.html (8,153 bytes)
207. [AMPS] Distortion, amp design, and 813s (newbie alert!!) (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 19 Sep 2001 20:30:45 -0400; I can't comment about the expected IMD of 813's, but I can about push-pull operation and NFB. In RF PA's, push pull is meaningless for distortion and IMD. Absolutely totally meaningless. It is a com; /archives//html/Amps/2001-09/msg00353.html (9,489 bytes)
208. [AMPS] Series C at tube (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 20 Sep 2001 04:29:06 -0400; Why? It certainly does not lower system Q. As a matter of fact, it raises system Q. It is a popular misconception passed along among VHF operators that a small series C between the tube an tank lowe; /archives//html/Amps/2001-09/msg00360.html (8,538 bytes)
209. [AMPS] Distortion Measurement Distortion (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 20 Sep 2001 05:32:10 -0400; For commercial equipment testing I have to use multiple sweep storage. The TS-2000 looks like inverted dinner plate instead of a pyramid. I take it as a sign the engineer who was supposed to look at; /archives//html/Amps/2001-09/msg00362.html (8,541 bytes)
210. [AMPS] Distortion Measurement Distortion (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 20 Sep 2001 12:48:52 -0400; Of course I use peak, but the peak hold does not work when looking at actual modulation with the narrow bandwidths and slow sweep required to accurately get a bandwidth picture. I normally set the a; /archives//html/Amps/2001-09/msg00373.html (8,092 bytes)
211. [AMPS] Series C at tube, Sorry, for C read L (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 20 Sep 2001 12:48:52 -0400; Hi Barry, Some people don't. There was a nice article in a VHF publication about how a small series C between the anode and tank reduces tank operating Q in VHF PA's. As you know, a small additional; /archives//html/Amps/2001-09/msg00374.html (8,578 bytes)
212. [AMPS] Additional Info Voltage Doubler/Filter Capacitance (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 21 Sep 2001 09:20:15 -0400; Ouch Kurt!! That is very high resistance, because the secondary ESR (equivalent series resistance) will be substantially higher than the secondary dc resistance. The actual resistance seen by the re; /archives//html/Amps/2001-09/msg00386.html (10,653 bytes)
213. [AMPS] Additional Info Voltage Doubler/Filter Capacitance (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 21 Sep 2001 10:14:48 -0400; I didn't seem to be able to do that Barry. I had to download the file. I could only run the bridge rectifier program, and it very clearly gave me incorrect answers. In one example I modelled a full; /archives//html/Amps/2001-09/msg00387.html (9,045 bytes)
214. [AMPS] Additional Info Voltage Doubler/Filter Capacitance (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 21 Sep 2001 11:58:47 -0400; Correction. I left out the fact I used one ampere of load current in the example below: 73, Tom W8JI W8JI@contesting.com -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting; /archives//html/Amps/2001-09/msg00389.html (9,341 bytes)
215. [AMPS] Additional Info Voltage Doubler/Filter Capacitance (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 21 Sep 2001 14:06:19 -0400; Doesn't work. I can double click all over the place and it stays a bridge. The help file says to doubleclick, you say to double click, but nothing happens. I have version 1.0.3.10 downloaded. Nil th; /archives//html/Amps/2001-09/msg00393.html (10,179 bytes)
216. [AMPS] Re: Voltage Doubler/Filter Capacitance conflict (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 21 Sep 2001 14:19:01 -0400; Ahhh, it has a conflict with my Pegasus mail software! When I close the Pegasus program the mouse clicks work, and the calculation changes as I change numbers for ESR. Unfortunately I get an error wh; /archives//html/Amps/2001-09/msg00394.html (9,187 bytes)
217. [AMPS] Which Came First? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sat, 22 Sep 2001 21:52:15 -0400; The original Ameritron inventory was taken over by the owner of Prime Instruments, W8IOB as a "loan adjustment". Prime already owned all the parts and tooling, but had nothing to do with the designs; /archives//html/Amps/2001-09/msg00406.html (7,991 bytes)
218. [AMPS] Noises in electrolytic capacitors (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 26 Sep 2001 11:04:02 -0400; It sounds like you have a capacitor charging to too much voltage. That is probably why the old ones failed. If you did not test or replace the equalizing resistors you made a serious omission. Pay a; /archives//html/Amps/2001-09/msg00418.html (9,166 bytes)
219. [AMPS] RFI from Clipperton-L (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 27 Sep 2001 11:05:40 -0400; What kind of tubes are you using? Some tube brands have a very high cutoff voltage. Clippertons make good oscillators on 15 and ten meters, because they use 4 572B's in parallel and are not neutrali; /archives//html/Amps/2001-09/msg00437.html (7,449 bytes)
220. [AMPS] Titan 425 amplifier problems (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 27 Sep 2001 11:05:40 -0400; If the tubes are shorted or gassy, that may be a problem for his good amp. Some Ten Tecs (maybe all?) don't have grid current trip circuits, and can eat up a set of tubes pretty fast if the grid cur; /archives//html/Amps/2001-09/msg00438.html (7,256 bytes)

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