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261. Re: [Amps] a common topic here tspa (score: 1): Author: Ian White G3SEK <G3SEK@ifwtech.co.uk>; Date: Thu, 7 Apr 2005 11:26:59 +0100; That seems to be conflating two different stories, on the basis of information from an individual Eimac employee which the company subsequently said was incorrect. The "oscillation condition" in ques; /archives//html/Amps/2005-04/msg00137.html (9,386 bytes)
262. Re: [Amps] a common topic here tspa (score: 1): Author: Ian White G3SEK <G3SEK@ifwtech.co.uk>; Date: Fri, 8 Apr 2005 08:37:37 +0100; Basically, yes - just like water (molten ice) will eventually evaporate completely away at room temperature. Everything has a vapour pressure, which increases with temperature. However, the rate of e; /archives//html/Amps/2005-04/msg00155.html (10,463 bytes)
263. Re: [Amps] Hipersil, the myth and the truth. (Updated) (score: 1): Author: Ian White G3SEK <G3SEK@ifwtech.co.uk>; Date: Mon, 18 Apr 2005 18:56:49 +0100; The British Navy liked to run their C-core transformers in oil, in two-piece pressed steel cans with ceramic feedthrough insulators. You can argue this either way: either they used C-cores because th; /archives//html/Amps/2005-04/msg00378.html (9,645 bytes)
264. Re: [Amps] article in Nature, modified Aurora via HF (score: 1): Author: Ian White G3SEK <G3SEK@ifwtech.co.uk>; Date: Mon, 18 Apr 2005 22:24:08 +0100; But how many reports of the "Luxembourg effect" over the decades have been due to cross-modulation in receivers? We skeptics need to know. -- 73 from Ian G3SEK _______________________________________; /archives//html/Amps/2005-04/msg00385.html (7,369 bytes)
265. Re: [Amps] Hipersil, the myth and the truth. (Updated) (score: 1): Author: Ian White G3SEK <G3SEK@ifwtech.co.uk>; Date: Tue, 19 Apr 2005 06:52:31 +0100; Heritage. There's a good example of his work at: http://www.gareventures.com/amplifier/dxpedition_amplifier_first_challeng e_1.htm This is the description of G3WOS's 8877 amp for 6m DXpeditions, whic; /archives//html/Amps/2005-04/msg00386.html (9,868 bytes)
266. Re: [Amps] Led display problem (score: 1): Author: Ian White G3SEK <G3SEK@ifwtech.co.uk>; Date: Tue, 19 Apr 2005 09:41:32 +0100; Maxim make a range of current monitoring ICs for exactly this kind of purpose. The two input terminals are connected by a low-value shunt resistor, and can 'float' up to about 30V. Output is a voltag; /archives//html/Amps/2005-04/msg00391.html (8,295 bytes)
267. Re: [Amps] COLLINS GANG BOOK (score: 1): Author: Ian White G3SEK <G3SEK@ifwtech.co.uk>; Date: Thu, 21 Apr 2005 08:23:42 +0100; "Pappenfus" is a pretty unique name to search for (not many other people of that name seem to have written a book). As well as Ebay, search the used book dealers (via Amazon or Google). It'll be well; /archives//html/Amps/2005-04/msg00421.html (7,442 bytes)
268. Re: [Amps] Resistors (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Mon, 25 Apr 2005 07:56:56 +0100; No problems with insulation, (if you have removed the copper) but the heat from the clips and the resistor body will probably damage the epoxy. It would be better to mount the clips on short ceramic; /archives//html/Amps/2005-04/msg00517.html (7,512 bytes)
269. Re: [Amps] email the Agilent lawyer .... no manuals on BAMA (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Mon, 25 Apr 2005 19:58:30 +0100; Too late... -- 73 from Ian GM3SEK _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2005-04/msg00532.html (8,367 bytes)
270. Re: [Amps] Plate transformer current unknown (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Sat, 30 Apr 2005 07:45:14 +0100; Was the "circular mil" invented by someone who couldn't spell "pi"? -- 73 from Ian GM3SEK 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.co.uk/g3sek ____________________________________; /archives//html/Amps/2005-04/msg00627.html (7,988 bytes)
271. Re: [Amps] Dummy Load (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Wed, 25 May 2005 23:35:02 +0100; 30dB seems to be a "magic number" where it's very practical to make a high-power attenuator based on an existing dummy load. For example, you can easily make a 30dB T-pad using an existing 50 ohm dum; /archives//html/Amps/2005-05/msg00297.html (9,328 bytes)
272. Re: [Amps] ACOM 2000A (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Thu, 9 Jun 2005 07:41:57 +0100; If one-half of your dipole falls down, the Acom 2000 will automatically re-tune and do its best to pump 2kW into this new "load". Better check your fire insurance :-) Seriously - a lovely amp. It ju; /archives//html/Amps/2005-06/msg00060.html (7,823 bytes)
273. Re: [Amps] GS35 QUESTION (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Sun, 12 Jun 2005 22:42:59 +0100; What's happening is that with the higher B+, the tube needs a higher bias voltage to cut it off. This voltage may be greater than the turn-on voltage of the VDRs, so some current will flow through th; /archives//html/Amps/2005-06/msg00080.html (7,917 bytes)
274. Re: [Amps] Fizzing From Amp (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Fri, 24 Jun 2005 09:20:56 +0100; Nicotine - or rather, the tar deposits - can be very bad for switches, variable capacitors and other contact surfaces. Amplifiers can be particularly bad, because the fan collects hours and years of; /archives//html/Amps/2005-06/msg00218.html (8,126 bytes)
275. Re: [Amps] Cheap network analyser on eBay (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Sat, 25 Jun 2005 21:04:39 +0100; Just to be clear: the only thing that's "not simple" about the N2PK board is that it uses surface-mount components. That may be new to some people, but it really isn't hard. The payback is that there; /archives//html/Amps/2005-06/msg00234.html (8,372 bytes)
276. Re: [Amps] Cheap network analyser on eBay (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Sat, 25 Jun 2005 22:32:26 +0100; Oh no, it's a very clever device. The concept has been around for some time, but N2PK has really made it work. As for accuracy, comparisons with commercial VNAs run very close indeed. I'm not aware o; /archives//html/Amps/2005-06/msg00240.html (9,453 bytes)
277. Re: [Amps] HV Switch Mode Power Supplies (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Sun, 26 Jun 2005 23:35:46 +0100; The point K5AND was making is that you don't needed a bleeder, so no power is wasted. When the amp is on (TX), the standing current in the PA tube brings the voltage down to the level where the regul; /archives//html/Amps/2005-06/msg00251.html (9,405 bytes)
278. Re: [Amps] watts unlimited smps (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Mon, 27 Jun 2005 00:12:15 +0100; I have the schematic here, and the grounding is not totally clear - there seem to be three different "ground" symbols used in various places. In different countries, those symbols could be interprete; /archives//html/Amps/2005-06/msg00252.html (8,450 bytes)
279. Re: [Amps] Watts unlimited SMPS solved (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Mon, 27 Jun 2005 18:17:31 +0100; So what was the problem? -- 73 from Ian GM3SEK _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2005-06/msg00261.html (7,149 bytes)
280. Re: [Amps] Tetrodes (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Mon, 11 Jul 2005 19:21:55 +0100; And the mains fuse protected the screen from what... and how? -- 73 from Ian G/GM3SEK http://www.ifwtech.co.uk/g3sek _______________________________________________ Amps mailing list Amps@contesting.; /archives//html/Amps/2005-07/msg00090.html (7,640 bytes)

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