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141. Re: [Amps] Amps Digest, Vol 93, Issue 16 (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Sun, 12 Sep 2010 11:17:33 +0100; Hi Bill UL recognised microswitches have been around for quite a while but they rely on the correct conditions like any other: mostly it comes down to not over-stressing either the contacts or the le; /archives//html/Amps/2010-09/msg00112.html (9,800 bytes)
142. Re: [Amps] HV Interconnects RF Decks to PS (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Sun, 12 Sep 2010 11:22:10 +0100; I think you mean armoured cable. David G3UNA ... wire that has been impacted, pinched, run over by castor wheels of 100 lb PSs. and that sort of thing. I have seen wire that is pinched hard under whe; /archives//html/Amps/2010-09/msg00113.html (7,186 bytes)
143. Re: [Amps] SHV connectors great, but where to find coax? (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Mon, 13 Sep 2010 06:54:59 +0100; I think another way of putting what Carl and Bill are saying is that home brewers are allowed to take their own risks *that don't involve anyone else,* whereas if you are building a rig for use by so; /archives//html/Amps/2010-09/msg00136.html (10,526 bytes)
144. Re: [Amps] What aluminum alloy to use for making PSU and RF deck (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Thu, 16 Sep 2010 17:46:50 +0100; There are hundreds of "tin bashers" in the UK and there must be plenty in Norway if you want a cabinet made for you. The challenge is to make a drawing they can understand, preferably in AutoCad or s; /archives//html/Amps/2010-09/msg00208.html (8,422 bytes)
145. Re: [Amps] Skin depth: silver plating of tank circuit coil feasible with chemical plating kits? (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Mon, 4 Oct 2010 17:36:05 +0100; Great set of tests Larry. Here is some stuff from the old days which I've posted here a few times: http://www.k6mhe.com/n7ws/Plating.pdf and http://www.k6mhe.com/n7ws/Fowler_Errata.pdf David G3UNA __; /archives//html/Amps/2010-10/msg00009.html (9,065 bytes)
146. Re: [Amps] Switching Supplies for High Current Filaments (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Thu, 7 Oct 2010 18:57:16 +0100; It's all a matter of filtering. Hitherto, valve heaters receive a low noise source of electrickery, but with this idea, there could be considerable noise from the switching waveform. Computer and oth; /archives//html/Amps/2010-10/msg00100.html (10,753 bytes)
147. Re: [Amps] O.T. Emails Gone. (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Fri, 8 Oct 2010 07:54:47 +0100; Happens over here, too. David G3UNA _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2010-10/msg00117.html (7,113 bytes)
148. Re: [Amps] New 2 PA design (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Sun, 17 Oct 2010 07:57:05 +0100; I'm drifting off topic a little but is it not preferable for heat transfer purposes to run several lower power transistors in parallel to reduce hot spots? There is also the opportunity to have redun; /archives//html/Amps/2010-10/msg00268.html (12,491 bytes)
149. Re: [Amps] New 2 PA design (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Sun, 17 Oct 2010 08:51:04 +0100; Hi Jim Using combiners is one way but I was particularly interested in parallel operation. David G3UNA If you use a bunch of low _______________________________________________ Amps mailing list Amps; /archives//html/Amps/2010-10/msg00271.html (8,194 bytes)
150. Re: [Amps] HV rectifier strings - to bypass or not? (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Sun, 31 Oct 2010 01:50:06 -0800; I agree with Carl that you don't want spikes to get into your electrolytics but any semiconductor as well, which of course includes the rectifier string. You might ask how they get through the mains; /archives//html/Amps/2010-10/msg00477.html (10,668 bytes)
151. Re: [Amps] our amplifier in 2010 CQWW (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Tue, 09 Nov 2010 11:18:41 -0800; The wider use of reverse beacons will accumulate enough statistical data on transgressors to dissuade them or disqualify them, there for all to see. David G3UNA ______________________________________; /archives//html/Amps/2010-11/msg00102.html (8,759 bytes)
152. Re: [Amps] our amplifier in 2010 CQWW (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Tue, 09 Nov 2010 12:16:51 -0800; I saw a demonstration at the RSGB HF Convention: lots of SDR receivers around the world are scanning the whole spectrum or parts of it giving relative signal strength readings and id for each station; /archives//html/Amps/2010-11/msg00104.html (9,573 bytes)
153. Re: [Amps] our amplifier in 2010 CQWW (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Tue, 09 Nov 2010 13:22:17 -0800; Sam I appreciate and understand what you are saying; by the way, well done, I like your style. But, wrt propagation, if you have 2 transmitters in the same town, one of whom is known to be a goody we; /archives//html/Amps/2010-11/msg00106.html (12,236 bytes)
154. Re: [Amps] MOVs (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Thu, 25 Nov 2010 11:13:55 -0800; It is my experience that MOVs should not be placed directly across the mains; they should have some limiting impedance, just like zeners do in a dc circuit. I always fit them downstream of the mains; /archives//html/Amps/2010-11/msg00444.html (9,487 bytes)
155. Re: [Amps] MOVs (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Thu, 25 Nov 2010 15:06:11 -0800; Roger Did those SCRs have an L/C filter out to the mains? I fit a MOV directly across the SCR or Triac. David G3UNA _______________________________________________ Amps mailing list Amps@contesting.c; /archives//html/Amps/2010-11/msg00454.html (8,863 bytes)
156. Re: [Amps] Adhesive forTeflon sheet.. (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Wed, 23 Mar 2011 08:31:14 -0800; I'm wondering if it is important for the ptfe to be in intimate contact with the base metal, ie no air gaps at all. If this is to carry substantial rf current, it's something to be aware of. It's not; /archives//html/Amps/2011-03/msg00169.html (9,325 bytes)

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