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121. Re: [Amps] TS-850 Output (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Fri, 25 Feb 2005 19:13:30 -0000; What devices are used in the 440 and/or 850? Thanks, Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2005-02/msg00825.html (7,464 bytes)
122. Re: [Amps] close to off topic - how to read antenna R + jX ?? (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Mon, 28 Feb 2005 09:34:24 +0000; I have a feeling that (electronic) repairs to the input probes might be less difficult than mythology suggests. Matched diodes aren't difficult to come by - four bought loose will almost certaily com; /archives//html/Amps/2005-02/msg00926.html (9,870 bytes)
123. Re: [Amps] Using DC On 3-500Z filaments for mobile operation? (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Fri, 4 Mar 2005 08:15:33 -0000; I can't see it changing the temperature of the filament, but I can see that it will lead to uneven emission along the length. Steve _______________________________________________ Amps mailing list A; /archives//html/Amps/2005-03/msg00040.html (7,882 bytes)
124. Re: [Amps] Water cooled amp question (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Sat, 5 Mar 2005 15:01:18 -0000; Of interest to UK readers in particular, for some years I ran a very modified 1300GT, which needed pure ethylene glycol as coolant otherwise the cylinders furthest from the water pump would overheat; /archives//html/Amps/2005-03/msg00093.html (9,618 bytes)
125. Re: [Amps] Diodes (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Sat, 5 Mar 2005 17:28:25 -0000; Given the prices of different options, I use a 35A bridge so there's two diodes in series back to back, and design the metering for <1V FSD. No worries about surge ratings. On a similar note, I've ha; /archives//html/Amps/2005-03/msg00111.html (7,412 bytes)
126. Re: [Amps] water cooled... (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Sun, 6 Mar 2005 16:02:35 -0000; It can depend on what you're trying to cool. If you have extreme temperatures, such as in a cylinder head, you can get vapour cavitation with water or water/glycol mixtures, which reduces cooling eff; /archives//html/Amps/2005-03/msg00160.html (8,495 bytes)
127. Re: [Amps] FW: RE: Liquid Cooling Systems (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Fri, 11 Mar 2005 08:07:04 -0000; Transferring heat across a metal-metal junction depends a lot on what happens at a microscopic level - imagine it like pressing the rough side of two pieces of sandpaper against each other. The actua; /archives//html/Amps/2005-03/msg00280.html (9,511 bytes)
128. Re: [Amps] Freq Counter (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Sat, 12 Mar 2005 07:31:40 -0000; See if the pin numbers stack up with 710 comparator - that was a popular 'front end' for counters in those days. Steve _______________________________________________ Amps mailing list Amps@contestin; /archives//html/Amps/2005-03/msg00307.html (6,895 bytes)
129. Re: [Amps] nylons (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Wed, 16 Mar 2005 11:50:57 +0000; At least one cross linked versions, Rexolite, is really good and also mechanically strong. It's horrible to machine, and very difficult to source this side of the Atlantic :-( Steve _________________; /archives//html/Amps/2005-03/msg00367.html (8,724 bytes)
130. Re: [Amps] nylons (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Wed, 16 Mar 2005 17:34:32 -0000; Don't jump to that - maybe my machinists weren't up to the challenge! I think it tends to clog and bind, I'm guessing there's an art to getting the tool sharpening and feed speeds just right. Can any; /archives//html/Amps/2005-03/msg00378.html (9,851 bytes)
131. Re: [Amps] nylons (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Wed, 16 Mar 2005 22:51:46 -0000; Looks like it's me that stands corrected. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2005-03/msg00385.html (9,084 bytes)
132. Re: [Amps] Henry 2K Classic X (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Fri, 18 Mar 2005 20:49:05 -0000; Is the onset of corona (visible or not) affected by frequency? Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo; /archives//html/Amps/2005-03/msg00399.html (8,028 bytes)
133. Re: [Amps] 4CX1000A for SSB?? (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Sat, 19 Mar 2005 08:02:22 -0000; I recall a 144MHz design in VHF Communications which showed excellent IMD from (I think) a 4CX1000A running at 750-1000W output. It's a couple of days until I can get near my stuff to look for it -; /archives//html/Amps/2005-03/msg00405.html (7,688 bytes)
134. Re: [Amps] Bird Element Calibration? (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Mon, 21 Mar 2005 09:55:28 +0000; No, at best they will have a half decent power meter from HP or Boonton or somesuch, which will get sent to a cal lab now and again, to be compared against a meter that's been compared against a mete; /archives//html/Amps/2005-03/msg00446.html (8,782 bytes)
135. [Amps] 4CX1000A IMD (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Mon, 21 Mar 2005 17:44:51 +0000; Figures from a 144MHz amp described by DJ4GC in VHF Communications, 4/85, p213-226. Va 3.2kV, Iaq 200mA, Vg2 320V. 2 tone IMD, figures are rel. either tone Po 750W pep 3rd -36dB 5th -50dB 7th -58dB P; /archives//html/Amps/2005-03/msg00464.html (6,289 bytes)
136. [Amps] Bird 43 (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Tue, 22 Mar 2005 21:26:44 -0000; Forgive me folks, I couldn't resist http://i4.ebayimg.com/01/i/03/aa/11/68_1_b.JPG Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.; /archives//html/Amps/2005-03/msg00502.html (6,300 bytes)
137. Re: [Amps] Bird Element Calibration? (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Thu, 24 Mar 2005 14:06:30 +0000; Life would be so much easier if my customers would understood that sometimes a dB really doesn't matter. Steve _______________________________________________ Amps mailing list Amps@contesting.com ht; /archives//html/Amps/2005-03/msg00542.html (8,383 bytes)
138. [Amps] Measuring power (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Fri, 25 Mar 2005 16:02:35 +0000; In case anyone might be interested, I looked out some data on a couple of the power meter systems I use here. The 'better', more modern, one uses HP8481A sensor which appears to be a bolometer - the; /archives//html/Amps/2005-03/msg00551.html (6,971 bytes)
139. Re: [Amps] Measuring RF Power (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Sat, 26 Mar 2005 09:10:48 -0000; It isn't true. V-rms^2/R = Pmean (or average). Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2005-03/msg00572.html (9,685 bytes)
140. Re: [Amps] Measuring RF Power (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Sat, 26 Mar 2005 11:05:58 -0000; Pmean (or average). Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2005-03/msg00574.html (10,078 bytes)

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