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1. [Amps] analyser on output (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Tue, 22 May 2007 18:11:05 +0100; Are there any threads, cautions, general advice, web sites to help with using an analyser on the output of an amplifier? I seek general enlightenment and a tool for comparing one amplifier with anoth; /archives//html/Amps/2007-05/msg00172.html (6,504 bytes)
2. Re: [Amps] Relais for an antenna crossover switch (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Tue, 26 Jun 2007 19:12:20 +0100; Guido The contact current rating should be derated for rf. I don't by how much for this relay, but a vacuum relay I have derates a 30A contact to 6A at 32MHz. In the vacuum relay heat cannot escape s; /archives//html/Amps/2007-06/msg00145.html (11,616 bytes)
3. Re: [Amps] Relais for an antenna crossover switch (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Wed, 27 Jun 2007 18:36:06 +0100; I saw a lot of these relays at Friedrichshafen for Euro15 last weekend. David G3UNA _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/m; /archives//html/Amps/2007-06/msg00155.html (10,404 bytes)
4. Re: [Amps] Slightly OT.... (score: 1): Author: <d.cutter@ntlworld.com>; Date: Thu, 28 Jun 2007 12:46:24 +0100; I remember my brother working with plastic welding machines; I think made by Redifon. Use a single large bottle with a light inside. Used only during daylight hours, ie before daytime tv so it didn't; /archives//html/Amps/2007-06/msg00167.html (7,855 bytes)
5. Re: [Amps] (no subject) (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Mon, 9 Jul 2007 18:22:18 +0100; fuses in the supply lines to an equipment : to prevent fire and shock hazards as a consequence of shorts in the cord or inside the equipment. The fuse is not (as far as BS is concerned) to protect t; /archives//html/Amps/2007-07/msg00120.html (9,396 bytes)
6. Re: [Amps] 200 Watt Fast Relay (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Tue, 10 Jul 2007 23:57:50 +0100; I once had to design an equipment with a switch with a very variable contact resistance. I made it work successfully by ensuring a small dc current passed thro the contacts on closure and this was en; /archives//html/Amps/2007-07/msg00173.html (9,083 bytes)
7. Re: [Amps] Fwd: Weighing In On Solder Water Wash Flux (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Thu, 12 Jul 2007 07:31:03 +0100; In companies I have worked for cleaning circuit boards was mainly a cosmetic requirement and made it easier to see circuit trace faults. It also prevented other debris from sticking to the boards. It; /archives//html/Amps/2007-07/msg00201.html (8,817 bytes)
8. Re: [Amps] Amplifier power supply? (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Sat, 14 Jul 2007 12:22:29 +0100; Magnetically I would have thought no problem, but you should consider how you are to cool them and insulate them from each other. If you are using just one central screw, you might want to consider t; /archives//html/Amps/2007-07/msg00222.html (9,530 bytes)
9. Re: [Amps] ALPHAs and momentary power outages (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Mon, 16 Jul 2007 18:14:44 +0100; Strictly speaking you only need the UPS for the heaters, since your rigs and everything else are off. This means supplying a separate transformer just for the heaters which might be practicable from; /archives//html/Amps/2007-07/msg00270.html (10,355 bytes)
10. Re: [Amps] linears and generators (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Tue, 17 Jul 2007 06:41:43 +0100; While we are on the subject, do you check your generator with a true rms meter? Some small generators I have had to use have more of a triangular waveform and 'ordinary' meters are not calibrated for; /archives//html/Amps/2007-07/msg00290.html (8,421 bytes)
11. Re: [Amps] 807s (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Mon, 30 Jul 2007 06:22:20 +0100; Presumably "instant heating" to meet the emergency or "reserve" requirements. I recall in the UK "instant" meant 6 seconds. David G3UNA _______________________________________________ Amps mailing li; /archives//html/Amps/2007-07/msg00518.html (7,937 bytes)
12. Re: [Amps] crossmodulation in PA ? (score: 1): Author: <d.cutter@ntlworld.com>; Date: Wed, 5 Sep 2007 15:18:28 +0100; A contest station probably already has high Q coax filters. David G3UNA -- Email sent from www.virginmedia.com/email Virus-checked using McAfee(R) Software and scanned for spam ______________________; /archives//html/Amps/2007-09/msg00026.html (8,572 bytes)
13. Re: [Amps] Load Pulling (score: 1): Author: <d.cutter@ntlworld.com>; Date: Wed, 12 Sep 2007 15:12:01 +0100; Used to do something like this in the 70's at microwave. David G3UNA -- Email sent from www.virginmedia.com/email Virus-checked using McAfee(R) Software and scanned for spam _________________________; /archives//html/Amps/2007-09/msg00122.html (9,741 bytes)
14. Re: [Amps] switching power supply for tube amplifier (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Sun, 16 Sep 2007 17:49:02 +0100; Manfred My personal problems with stabilising (I have limited experience in this design area) are: adding regulation means putting an inductor in the output and as a consequence getting the phasing/f; /archives//html/Amps/2007-09/msg00168.html (10,676 bytes)
15. Re: [Amps] switching power supply for tube amplifier (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Mon, 17 Sep 2007 07:30:08 +0100; Was the vibrator pack the first switchmode psu? Still in use in the late '70's, maybe longer. Fairly short life for the vibrator, though. Perhaps a mercury wetted version would have better life. Davi; /archives//html/Amps/2007-09/msg00176.html (9,652 bytes)
16. Re: [Amps] switching power supply for tube amplifier (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Tue, 18 Sep 2007 18:37:36 +0100; Manfred Thanks for that detailed explanation: I like the way you use a sound card to help with getting the stability right. Say you have a simple, non-stabilised switcher; then, in a push pull or bri; /archives//html/Amps/2007-09/msg00202.html (9,090 bytes)
17. Re: [Amps] CB etc Amps (score: 1): Author: <d.cutter@ntlworld.com>; Date: Thu, 11 Oct 2007 10:25:51 +0100; Also mobile antennas are usually much narrower in bandwidth which helps. David G3UNA -- Email sent from www.virginmedia.com/email Virus-checked using McAfee(R) Software and scanned for spam _________; /archives//html/Amps/2007-10/msg00123.html (9,167 bytes)
18. Re: [Amps] What is happening? (score: 1): Author: <d.cutter@ntlworld.com>; Date: Mon, 15 Oct 2007 8:35:00 +0100; It's not just the Amps reflector, I'm getting other reflectors repeating, I think it is the ISP somehow David G3UNA -- Email sent from www.virginmedia.com/email Virus-checked using McAfee(R) Software; /archives//html/Amps/2007-10/msg00183.html (7,391 bytes)
19. Re: [Amps] PEP Wattmeters (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Fri, 19 Oct 2007 17:35:48 +0100; Larry The TS922 will drive capacitive loads and there are other modern op amps also. There is a LT product I cannot quite remember (let me get back to the office on Monday) that is also very low powe; /archives//html/Amps/2007-10/msg00230.html (8,403 bytes)
20. Re: [Amps] Alpha 87A Mic Click Grid Current Spike (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Fri, 9 Nov 2007 00:03:23 -0000; I've heard that some transceivers produce a high power leading edge which particularly Alphas with protection circuitry don't like. IC706 comes to mind, I dare say others, too. David G3UNA __________; /archives//html/Amps/2007-11/msg00124.html (8,522 bytes)

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