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161. [Amps] Switch-mode HV power supply (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Thu, 11 Mar 2004 13:52:43 +0000; Does anyone recall the URL for the switch-mode HV power supply that was featured in QST New Product some months ago? Has anyone tried it? -- 73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB; /archives//html/Amps/2004-03/msg00108.html (7,064 bytes)
162. Re: [Amps] Switch-mode HV power supply (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Fri, 12 Mar 2004 08:24:38 +0000; Does anyone recall the URL for the switch-mode HV power supply that was featured in QST New Product some months ago? Has anyone tried it? Thanks to everyone who replied: it's http://wattsunlimited.co; /archives//html/Amps/2004-03/msg00123.html (9,344 bytes)
163. Re: [Amps] Switch-mode HV power supply (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Fri, 12 Mar 2004 13:11:39 +0000; Sorry, I gave the wrong URL for G3WOS's 8877 amp. It should be: http://www.gare.co.uk/amplifier/ -- 73 from Ian G3SEK _______________________________________________ Amps mailing list Amps@contesting; /archives//html/Amps/2004-03/msg00127.html (7,257 bytes)
164. Re: [Amps] Switch-mode HV power supply (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Mon, 15 Mar 2004 07:45:36 +0000; Oleg Skydan wrote: Here is the URL: http://www.qsl.net/dl2kq/pa/1-1.htm It is in Russian, but there is a button (in the upper-left corner of the page) for on-line translation. The translation engine; /archives//html/Amps/2004-03/msg00162.html (10,000 bytes)
165. Re: [Amps] Interesting news (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Mon, 15 Mar 2004 08:03:22 +0000; Leigh S. Jones wrote: Well, I'm comparing the new 3CX1500D7 with the 8877 -- and it seems that Eimac would probably rather announce this tube in the context of a replacement for a pair of 3-500Z's. T; /archives//html/Amps/2004-03/msg00163.html (8,758 bytes)
166. Re: [Amps] noisy sb1000 (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Mon, 15 Mar 2004 07:55:51 +0000; George wrote: HI The sb1000 is working now and keys fine but the PS is really noisy (buzzing) unkeyed. Does any one else have any experience with this. any recommendations? Im going to try and tighte; /archives//html/Amps/2004-03/msg00170.html (8,009 bytes)
167. Re: [Amps] Switch-mode HV power supply (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Tue, 16 Mar 2004 23:36:04 +0000; Steve Thompson wrote: On Monday 15 March 2004 07:45, Ian White, G3SEK wrote: When I started this discussion, I should have said that one of my criteria for choosing a PA is that it should give a sign; /archives//html/Amps/2004-03/msg00180.html (11,840 bytes)
168. Re: [Amps] insulation (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Thu, 25 Mar 2004 08:23:30 +0000; John T. M. Lyles wrote: G10 will melt down into an awful stinkin' and burnin' mess when heated in high Rf fields. I rarely use it anymore, except for PW applications. It is certainly a big step above; /archives//html/Amps/2004-03/msg00270.html (11,115 bytes)
169. Re: [Amps] insulation (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Fri, 26 Mar 2004 14:33:44 +0000; W0UN -- John Brosnahan wrote: The opposite example is that I once used Delrin for the PA tuning shaft in a little 6522 2m transmitter. The capacitor rotor was *supposed* to be at RF ground, and that; /archives//html/Amps/2004-03/msg00289.html (9,864 bytes)
170. Re: [Amps] Re: GU-84b: Drive power required for full power output ? (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Mon, 29 Mar 2004 09:50:33 +0100; john devoldere wrote: -150V is CUT -OFF bias in AB1 or AB2 I use approx -65 V if I remember correctly. -65V seems about right, with Vg2=375V. Those voltages should allow "ultra-linear" operation, wit; /archives//html/Amps/2004-03/msg00338.html (9,288 bytes)
171. Re: [Amps] SB-221 Why is the the variable load capacitor onlycrimpedto the ... (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Thu, 1 Apr 2004 08:51:59 +0100; Steve Thompson wrote: Possibly because regular soldering can melt under the heat of the circulating tank circuit current. A mechanical connection is better for this area, there is nothing that can me; /archives//html/Amps/2004-04/msg00001.html (9,115 bytes)
172. Re: [Amps] Re: Drake L7 newbie - Summary (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Thu, 1 Apr 2004 09:14:26 +0100; rlm wrote: [I've changed the topic order slightly here] ð The aforementioned ECBS obviates the need for the relay. ? You could install QSK without changing the biasing method, or change the biasi; /archives//html/Amps/2004-04/msg00002.html (11,058 bytes)
173. Re: [Amps] HV cable for abt 200 degrees celsius? (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Tue, 13 Apr 2004 07:41:02 +0100; Frank Goenninger wrote: Hi all: Yet another question for building this GU-84b based amp: What cables would you suggest (and where to get that in Europe) for the High Voltage (abt 4 kV) connections wi; /archives//html/Amps/2004-04/msg00085.html (8,335 bytes)
174. Re: [Amps] Water Cooling (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Wed, 14 Apr 2004 07:42:22 +0100; N9RF wrote: Has anyone experience with water cooling (GS-35B in particular; any tube in general)? I have been told it may not be feasible at 4KV. Also, if the cooler is in the cavity (coaxial or stri; /archives//html/Amps/2004-04/msg00090.html (9,324 bytes)
175. Re: [Amps] Water Cooling (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Thu, 15 Apr 2004 08:10:34 +0100; rlm wrote: One problem with water is that it absorbs CO2 from the atmosphere. Humans exhale CO2. This turns water into carbonic acid -- which is an electrical conductor. So plant water lilies to abso; /archives//html/Amps/2004-04/msg00100.html (8,784 bytes)
176. Re: [Amps] Serious design stage (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Wed, 21 Apr 2004 08:08:46 +0100; Jim Isbell wrote: After collecting parts for most of a year I am in the serious design stage of a 4-1000A linear. The power supply, because of its size is to be external and connected by a cable. In; /archives//html/Amps/2004-04/msg00131.html (9,257 bytes)
177. [Amps] What's inside a vacuum relay? (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Sat, 1 May 2004 08:00:50 +0100; Specifically, what makes them so fast? I've never seen a picture of how the typical small ITT/Jennings/Kilovac relays work, and they're too rare over here to justify taking one apart... besides, it w; /archives//html/Amps/2004-05/msg00011.html (7,061 bytes)
178. Re: [Amps] Custom HV transformers - UK (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Tue, 4 May 2004 07:50:38 +0100; Mark Hill wrote: Folks, Any recommendations as to UK-based companies that will custom wind single phase, multi-kVA HV transformers suitable for valve PA's? I have had a quote from Express Transformer; /archives//html/Amps/2004-05/msg00044.html (8,403 bytes)
179. Re: [Amps] Vacuum relay speed (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Thu, 6 May 2004 07:24:24 +0100; K8LV wrote: [...] First, the only moving part is the blade itself, which is extremely light weight. Also, it moves very little, since the air gap between contacts is much smallet than normal. This is; /archives//html/Amps/2004-05/msg00059.html (7,396 bytes)
180. Re: [Amps] DVM recomendation (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Sat, 8 May 2004 08:46:16 +0100; R. Measures wrote: G3RZP had written: If you are looking to do measurements round an amplifier when there's RF around, get an analogue meter! I haven't found a digital voltmeter yet that behaves with; /archives//html/Amps/2004-05/msg00086.html (9,760 bytes)

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