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41. [AMPS] YC156 / 3CX5000A7 amp. (score: 1): Author: drkirkby@ntlworld.com (David Kirkby); Date: Sun, 24 Dec 2000 21:32:14 +0000; Hi, I'm in the process of constructing a 2m amplifier using the YC156 or 3CX5000A7 tubes - the tubes are not identical, but are similar. See http://www.david-kirkby.co.uk/ham/yc156.html The driver, w; /archives//html/Amps/2000-12/msg00294.html (7,365 bytes)
42. [AMPS] YC156 / 3CX5000A7 amp. (score: 1): Author: drkirkby@ntlworld.com (David Kirkby); Date: Mon, 25 Dec 2000 11:45:33 +0000; I'll dig the directional coupler out. The first thing I did was try to expand my finite difference software at http://www.david-kirkby.co.uk/ham/finite.html to handle directional couplers. As it stan; /archives//html/Amps/2000-12/msg00302.html (12,564 bytes)
43. [AMPS] Wanted - Scanned transmitting tube data sheets. (score: 1): Author: drkirkby@ntlworld.com (David Kirkby); Date: Fri, 29 Dec 2000 15:14:49 +0000; Does anyone have any data sheets on commonly used amateur radio tubes that they would be willing to scan and send me by email and GIF or TIFF ? I've got a small collection (2C39A, 3CX100A5, 3CPX5000A; /archives//html/Amps/2000-12/msg00346.html (7,494 bytes)
44. [AMPS] On-off, or leave it on? (score: 1): Author: drkirkby@ntlworld.com (David Kirkby); Date: Sun, 31 Dec 2000 02:06:37 +0000; There is a paper "Techniques to Extend the Service Life of High Power Transmitter Tubes" by the Voice of America technical department, in a PDF file on Burle's web site - http://www.burle.com/applica; /archives//html/Amps/2000-12/msg00375.html (9,342 bytes)
45. [AMPS] Wanted - Eimac Y808 data sheet (score: 1): Author: drkirkby@ntlworld.com (David Kirkby); Date: Sun, 31 Dec 2000 03:27:05 +0000; Does anyone have a data sheet or any information on the Eimac Y808 tube http://www.david-kirkby.co.uk/ham/y799-amp/y808-2.jpg It's conduction cooled and similar to the air cooled 4CX250B, but I belie; /archives//html/Amps/2000-12/msg00376.html (7,224 bytes)
46. [Amps] Could you test latest Transmission line software? (score: 1): Author: "Dr. David Kirkby" <drkirkby@ntlworld.com>; Date: Sat, 30 Aug 2003 06:08:24 +0100; I'd like to thank everyone who has recently tested some software of mine http://atlc.sourceforge.net/ for computing the properties of arbitrary shaped transmission lines and couplers. Hopefully this; /archives//html/Amps/2003-08/msg00079.html (9,310 bytes)
47. Re: [Amps] X-TRA TUBE DAYS (score: 1): Author: "Dr. David Kirkby" <drkirkby@ntlworld.com>; Date: Wed, 10 Sep 2003 14:51:46 +0100; I do wonder with the increased use of surface mount components, this is going to become more and more difficult in years to come. Many chips are now only available surface mount. Some of them having; /archives//html/Amps/2003-09/msg00092.html (9,123 bytes)
48. Re: [Amps] Using surface-mount devices (score: 1): Author: "Dr. David Kirkby" <drkirkby@ntlworld.com>; Date: Sat, 13 Sep 2003 12:52:30 +0100; and professionally made. Perhaps you have better techniques than me Chris, but I would only ever get a board professionally made for those dimension. Gone are the days of laying out the board with ta; /archives//html/Amps/2003-09/msg00112.html (9,973 bytes)
49. [Amps] Windows executables for analysis of transmission lines. (score: 1): Author: "Dr. David Kirkby" <drkirkby@ntlworld.com>; Date: Sat, 13 Sep 2003 18:14:01 +0100; Mark Chun KH6HPQ has kindly produced some 32-bit Windows executables for the latest release of my software 'atlc' for numerically computing the properties of arbitrary shaped transmission lines (incl; /archives//html/Amps/2003-09/msg00115.html (10,754 bytes)
50. Re: [Amps] Using surface-mount devices (score: 1): Author: "Dr. David Kirkby" <drkirkby@ntlworld.com>; Date: Wed, 17 Sep 2003 00:58:46 +0100; Yes, there is probably a lot of truth in that. That's probably not helped by the fact that one can gain an amateur license whilst learning next to nothing. I recall reading once (~15 years ago) in Ra; /archives//html/Amps/2003-09/msg00149.html (10,566 bytes)
51. Re: [Amps] meter shunt (score: 1): Author: "Dr. David Kirkby" <drkirkby@ntlworld.com>; Date: Sun, 21 Sep 2003 05:59:04 +0100; If the resistor has burt out, there is a good chance the mater has too, so I would check that first. The value depends very much on the meter you have - its FSD and internal resistance as well as the; /archives//html/Amps/2003-09/msg00179.html (9,378 bytes)
52. [Amps] Imepdance of twin dielectric coax. (score: 1): Author: "Dr. David Kirkby" <drkirkby@ntlworld.com>; Date: Wed, 15 Oct 2003 02:06:35 +0100; Sorry if this is a little off-top, but hopefully not too much. Would anyone know if there is an exact analytical solution to the capacitance per metre (and/or the related impedance) of a coaxial cabl; /archives//html/Amps/2003-10/msg00131.html (8,644 bytes)
53. [Amps] Re: VHFDX: Imepdance of twin dielectric coax. (score: 1): Author: "Dr. David Kirkby" <drkirkby@ntlworld.com>; Date: Wed, 15 Oct 2003 14:54:59 +0100; I'm not really sure if such a cable exists or not. I don't know the HSJ-40, but I have come across so called 'air dielectric' cables, where there is a thin spiral spacer keeping the inner from the ou; /archives//html/Amps/2003-10/msg00136.html (13,348 bytes)
54. [Amps] Re: VHFDX: Imepdance of twin dielectric coax. (score: 1): Author: "Dr. David Kirkby" <drkirkby@ntlworld.com>; Date: Mon, 20 Oct 2003 00:29:17 +0100; No, you have misunderstood me. The structure is not as you describe, but as can be seen here. http://www.microwaves101.com/encyclopedia/dualdielectric.cfm with just one inner and one outer conductor,; /archives//html/Amps/2003-10/msg00174.html (12,486 bytes)
55. Re: [Amps] Zener Diode needed (score: 1): Author: "Dr. David Kirkby" <drkirkby@ntlworld.com>; Date: Mon, 20 Oct 2003 11:00:20 +0100; Do you mean 50 W, rather than 50 A? If not, I don't think it would be possible to get one in a TO-3 case, as the heat to be removed would be too much. -- "The day Microsoft makes something that doesn; /archives//html/Amps/2003-10/msg00185.html (7,080 bytes)

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