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261. Re: [Amps] Thanks (to whoever) for the 4CW2000A data sheet. (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Tue, 10 Apr 2007 00:08:01 +0100; Thanks Steve. If anyone has any data sheets (preferably pdf), feel free to upload them using: http://www.althorne.org/php/ They will then appear here: http://www.althorne.org/up/ (but with permission; /archives//html/Amps/2007-04/msg00040.html (8,356 bytes)
262. Re: [Amps] Another ePay CB Gem.... (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Wed, 26 Mar 2008 21:01:07 +0000; I think this one is better myself. http://www.g8wrb.org/useful-stuff/ebay-auctions/bad-amplifier.pdf _______________________________________________ Amps mailing list Amps@contesting.com http://lists; /archives//html/Amps/2008-03/msg00284.html (8,691 bytes)
263. Re: [Amps] Suggestions for Storage of Amps and Radios (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Tue, 15 Apr 2008 23:29:40 +0100; I would tend to buy *new* silica jell not use something that has been in a shoe box. It might well be dry, but you don't know. Here in the UK, both RS and Farnell sell it quite cheaply. I bought some; /archives//html/Amps/2008-04/msg00203.html (9,358 bytes)
264. Re: [Amps] 3CX3000A7 input impedance (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Mon, 21 Apr 2008 07:54:16 +0100; Hi all. I'm Dave G8WRB and I own the domain g8wrb.org. There is certainly nothing I have put there to grab passwords. Unlike all the other domains I own, which I host myself at home, g8wrb.org is pro; /archives//html/Amps/2008-04/msg00246.html (8,952 bytes)
265. Re: [Amps] 3CX3000A7 input impedance (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Mon, 21 Apr 2008 12:04:02 +0100; Thank you very much for confirming there were no problems on http://www.g8wrb.org/ I just installed a 15-day trial of ZoneAlarm pro on a PC I have here running XP pro. That can't find any problems, N; /archives//html/Amps/2008-04/msg00248.html (9,379 bytes)
266. Re: [Amps] 3CX3000A7 input impedance (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Mon, 21 Apr 2008 17:19:28 +0100; Hi Carl, One possibility is that one of the many computers/routers/switches etc between the web server and your machine has been compromised. That is then adding in code to attempt to read a password; /archives//html/Amps/2008-04/msg00251.html (14,995 bytes)
267. Re: [Amps] 3CX3000A7 input impedance (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Mon, 21 Apr 2008 18:09:23 +0100; What do you mean by "jump through hoops?" 1) The triode page: http://www.g8wrb.org/triodes.php has a link to the data sheet (scroll down to where it says Svetlana 3CX3000A7 The link points to http://; /archives//html/Amps/2008-04/msg00253.html (10,519 bytes)
268. Re: [Amps] 3CX3000A7 input impedance (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Mon, 21 Apr 2008 22:09:33 +0100; I'd agree there is a problem, with the image. I looked on 3 computers and I have 8 copies of that file, but all are identical copies, so its not something I can do anything about. Either Svetlana pro; /archives//html/Amps/2008-04/msg00256.html (9,587 bytes)
269. Re: [Amps] current in primary of microwave oven transformer (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Wed, 23 Apr 2008 10:08:24 +0100; The power dissipated is V*I*Cos(phi) where phi is the phase angle between the voltage and current. (Assuming they are pure sine waves of course, which is not necessary so.) There are ICs around which; /archives//html/Amps/2008-04/msg00266.html (8,585 bytes)
270. Re: [Amps] current in primary of microwave oven transformer (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Thu, 24 Apr 2008 13:57:32 +0100; No, at least in the UK we are billed by power, and not by current. I know someone who managed to get free power by making use of the small voltage between earth and neutral. He knew of someone who cl; /archives//html/Amps/2008-04/msg00282.html (8,603 bytes)
271. Re: [Amps] current in primary of microwave oven transformer (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Sat, 26 Apr 2008 09:22:36 +0100; If I recall correctly, (and its a very long time since I did my EE degree), it can be shown that a transformer has maximum efficiency when the copper loss is equal to the iron loss. Hence if either o; /archives//html/Amps/2008-04/msg00300.html (11,275 bytes)
272. [Amps] Anyone know RF properties of Acrylic?? (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Fri, 23 May 2008 07:20:05 +0100; Does anyone know how Acrylic behaves in the presence of RF? Will it significantly absorb RF up to 2.5 GHz? _______________________________________________ Amps mailing list Amps@contesting.com http:/; /archives//html/Amps/2008-05/msg00167.html (6,365 bytes)
273. [Amps] How to test a balun? (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Sun, 25 May 2008 18:47:11 +0100; Does anyone know how best to test a balun, consisting of a quater wave section at about 1 GHz. Its quite a common design, with a tube connected to the braid of a coax quarter wave from the end. I'm n; /archives//html/Amps/2008-05/msg00179.html (6,883 bytes)
274. [Amps] Anyone got programming manual for HP 70000 series? (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Sun, 25 May 2008 18:52:58 +0100; A bit off topic, but does anyone here have a programming manual for an HP 70000 mainframe? I need to program one which is fitted with bits for a spectrum analyser - RF section, IF section, display, l; /archives//html/Amps/2008-05/msg00180.html (7,067 bytes)
275. [Amps] Thoughts on half-wave dipole (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Sun, 27 Jul 2008 20:10:42 +0100; I know this is a bit off-topic. but possibly someone here has some thoughts. I've posted it to rec.radio.amateur.antenna and sci.electronics.design, but someone here might know. I've corrected a coup; /archives//html/Amps/2008-07/msg00295.html (9,939 bytes)
276. Re: [Amps] Thoughts on half-wave dipole (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Mon, 28 Jul 2008 16:47:57 +0100; Hi Jim, I agree its a bit off-topic, but I think many might agree its a bit more interesting than some of the junk on here. Any votes for what is most interesting - this or parasitic oscillations? It; /archives//html/Amps/2008-07/msg00325.html (10,590 bytes)
277. Re: [Amps] Thoughts on half-wave dipole (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Mon, 28 Jul 2008 16:50:03 +0100; As you say, it is not trivual. Beta is 2*pi/lambda. I've just put a graph of one of the formulas at http://www.g8wrb.org/schelkunoff-full.jpg _______________________________________________ Amps mail; /archives//html/Amps/2008-07/msg00326.html (9,519 bytes)
278. Re: [Amps] Thoughts on half-wave dipole (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Mon, 28 Jul 2008 16:55:51 +0100; You can be sure a numerical method, such as from NEC would be more accurate than any antenna analyser such as the MJF if that is what you are thinking of. You could no doubt use it to calibrate your; /archives//html/Amps/2008-07/msg00327.html (8,115 bytes)
279. Re: [Amps] Thoughts on half-wave dipole (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Mon, 28 Jul 2008 17:14:15 +0100; schelkunoffhalf.jpg I've stuck another graph up, which shows the indepdance better around 0.5 lambda. The point of intersection of the lines if j 41.2 Ohms. http://www.g8wrb.org/schelkunoffhalf.jpg A; /archives//html/Amps/2008-07/msg00329.html (10,235 bytes)
280. Re: [Amps] Thoughts on half-wave dipole (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Mon, 28 Jul 2008 18:02:14 +0100; I rather expected there was some here that had some knowledge on this topic, which might well not have looked at the other place. _______________________________________________ Amps mailing list Amp; /archives//html/Amps/2008-07/msg00336.html (8,884 bytes)

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