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1. Re: [Amps] Stripline design (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Fri, 20 Nov 2009 00:37:50 +0000; I think the original poster wanted an understanding of stripline design - something you do not get by plugging in dimensions into expensive closed-source 'black-box' software. The theory of transmiss; /archives//html/Amps/2009-11/msg00206.html (14,193 bytes)
2. Re: [Amps] Stripline design (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Thu, 19 Nov 2009 23:13:28 +0000; The theory and the practice do not always agree too much, but some of the RSGB and ARRL manuals do cover the theory Basically you need to make a transmission which has an equal and opposite reactance; /archives//html/Amps/2009-11/msg00204.html (11,126 bytes)
3. Re: [Amps] Eimac tube on the 'bay (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Wed, 28 Oct 2009 22:47:53 +0000; I can't say for the USA, but I have it in my house. The reason it was installed was the load of 27 'economy 7' storage heaters. The heaters were distributed around the 3 phases. If you said you inten; /archives//html/Amps/2009-10/msg00346.html (9,547 bytes)
4. Re: [Amps] Query about capacitor value (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Tue, 15 Sep 2009 14:19:36 +0100; Ultimately, it it worth what someone is willing to pay for it. Stick it on eBay and see what it fetches. Not knowing its specs is likely to devalue it quite a bit. It's probably not too useful as a 5; /archives//html/Amps/2009-09/msg00195.html (8,049 bytes)
5. Re: [Amps] [Moon-net] Major breakthrough with regenerative yagi. (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Wed, 20 May 2009 07:41:20 +0100; Interesting you say that. I wonder how many other kids have had the same idea. It is probably the easiest concept of a perpetual motion machine to understand. I can't think of an easier example mysel; /archives//html/Amps/2009-05/msg00133.html (10,520 bytes)
6. Re: [Amps] [Moon-net] Major breakthrough with regenerative yagi. (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Wed, 20 May 2009 07:26:01 +0100; We have the same problem here in the England - you may have seen it hit the news in the USA, as numerous things have been leaked by the Daily Telegraph. Basically our MPs have been having a great tim; /archives//html/Amps/2009-05/msg00132.html (11,794 bytes)
7. Re: [Amps] [Moon-net] Major breakthrough with regenerative yagi. (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Tue, 19 May 2009 10:33:16 +0100; It may have been sent as a joke, but perhaps it was not. Both myself and Leif (SM5BSZ) gave it some attention. Perhaps we were both fooled, but perhaps you are mistaken too. I've come across a lot of; /archives//html/Amps/2009-05/msg00118.html (8,778 bytes)
8. [Amps] Donations wanted for http://www.g8wrb.org/ (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Fri, 15 May 2009 09:45:19 +0100; Many of you have no doubt made use of http://www.g8wrb.org/ for data sheets on tubes, information on the YC156 or whatever else you found interesting. Due to the space and bandwidth requirements, thi; /archives//html/Amps/2009-05/msg00067.html (7,460 bytes)
9. Re: [Amps] 4CX1500B cathode Connection (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Mon, 23 Feb 2009 17:19:30 +0000; There's a complete data sheet online at http://www.g8wrb.org/data/Eimac/4CX1500B.pdf The download will be quite slow, as this is hosted on a home computer now. I used to have complimentary hosting fo; /archives//html/Amps/2009-02/msg00661.html (7,862 bytes)
10. 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)
11. 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)
12. 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)
13. 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)
14. 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)
15. [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)
16. [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)
17. [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)
18. [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)
19. 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)
20. 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)

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