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201. Re: [Amps] RE : ?amp hardware (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Thu, 12 Apr 2007 10:57:11 +0100
wrote: It varies with the type and thickness of the metal, and the type of screw as well. The only method you can completely rely on is to try a range of different sizes, in small steps (eg 0.1mm / 4
/archives//html/Amps/2007-04/msg00089.html (8,623 bytes)

202. Re: [Amps] Henry 2K-3 key...how to crack... (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Mon, 7 May 2007 13:40:48 +0100
wrote: Google for "lock picking" - it'll scare you. -- 73 from Ian GM3SEK _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/lis
/archives//html/Amps/2007-05/msg00055.html (6,866 bytes)

203. [Amps] News of G3RZP (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sun, 20 May 2007 23:29:12 +0100
Peter has asked to pass on his regrets for not being at Dayton, and to let you know that he will not be active on AMPS for a few weeks, as he is in hospital with kidney trouble. His wife says he is r
/archives//html/Amps/2007-05/msg00153.html (6,685 bytes)

204. Re: [Amps] LOU - BOB DD meeting (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Tue, 22 May 2007 16:38:45 +0100
In blood, this time? -- 73 from Ian GM3SEK _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2007-05/msg00170.html (7,748 bytes)

205. [Amps] [AMPS] G3RZP update (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 1 Jun 2007 09:46:09 +0100
Peter called last night, sounding in good form. He is out of the specialist kidney unit at Oxford, and back in the local hospital. Although he says he never felt too bad, he was told that he had been
/archives//html/Amps/2007-06/msg00000.html (6,233 bytes)

206. Re: [Amps] Re 200w fast relay (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Mon, 9 Jul 2007 19:23:55 +0100
AD5X has two web articles on QSK conversions using the Nais / Matsushita / Panasonic DS2E-M-DC12V DPDT relay. (The same company seems to use a number of different brand names, which surely doesn't he
/archives//html/Amps/2007-07/msg00124.html (8,439 bytes)

207. Re: [Amps] Amplifier power supply? (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sat, 14 Jul 2007 12:20:45 +0100
Hi Andy Can't see why not. Being toroidal transformers, the magnetic fields should be entirely contained within each individual transformer. Also, you'd probably want to space them a little way apart
/archives//html/Amps/2007-07/msg00221.html (8,924 bytes)

208. Re: [Amps] Amplifier power supply? (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sat, 14 Jul 2007 15:37:16 +0100
Hello Tom W8JI That is important for RF applications, but mains application are several orders of magnitude away in permeability, numbers of turns and frequency. OK, enough theory... Having an identi
/archives//html/Amps/2007-07/msg00228.html (10,030 bytes)

209. Re: [Amps] LK 500 ZA heat (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Tue, 14 Aug 2007 07:59:53 +0100
Steve is right. The turbulent air from the outlet of a fan makes a huge difference to the cooling efficiency. If you follow a thin streamer of smoke through a typical flat-pack fan, the streamer hold
/archives//html/Amps/2007-08/msg00066.html (11,026 bytes)

210. Re: [Amps] Filament overwind on an EHT Toroidal (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Thu, 23 Aug 2007 08:35:21 +0100
Just because those two windings exist on the HV transformer, it doesn't mean you have to use them - and there are very good reasons not to. There has to be a second small transformer anyway, permanen
/archives//html/Amps/2007-08/msg00149.html (10,572 bytes)

211. Re: [Amps] GS-23B Tetrode (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Tue, 28 Aug 2007 08:33:28 +0100
Operating position is "any". I don't know about the self neutralizing frequency specifically, but the GS-23B is used successfully in amplifiers up to and including 1.3GHz (cue K5GW). -- 73 from Ian G
/archives//html/Amps/2007-08/msg00222.html (7,023 bytes)

212. [Amps] Blowers for metal-ceramic tubes (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sat, 1 Sep 2007 18:21:09 +0100
I have posted an Excel spreadsheet that will estimate the performance of a centrifugal blower from the wheel diameter, width and rpm. This can be compared with the requirements for any particular tub
/archives//html/Amps/2007-09/msg00003.html (6,827 bytes)

213. Re: [Amps] CB Amps or full spectrum??? (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Thu, 11 Oct 2007 08:17:24 +0100
I've never understood why people drape a diode over the top of a transistor package. Everybody does it... but why? The diode cannot possibly sense short-term temperature changes inside the RF transis
/archives//html/Amps/2007-10/msg00121.html (10,473 bytes)

214. Re: [Amps] tuner anomalies (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Wed, 31 Oct 2007 09:13:30 +0000
A very strong possibility is that a coax shield connection has opened up somewhere, so you suddenly have RF currents crawling all over your system. Quite likely the tuner is only showing the symptoms
/archives//html/Amps/2007-10/msg00283.html (8,935 bytes)

215. Re: [Amps] Testing 8874s (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 2 Nov 2007 08:16:25 +0000
Agreed about the IMD; but those tubes will probably have to be pulled anyway, due to thermal runaway. We learned far too much about this subject in the Bad Old Days when 4CX250 pulls were the only ch
/archives//html/Amps/2007-11/msg00016.html (8,911 bytes)

216. Re: [Amps] Meter Scales (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Tue, 6 Nov 2007 10:53:29 +0000
Peak grid current of 300mA is about right in normal operation, so the meter could be 400 or 500mA full scale. If you have a grid-current trip, a setting of 400-500mA would allow for tune-up while als
/archives//html/Amps/2007-11/msg00075.html (7,363 bytes)

217. Re: [Amps] Bird 1KW+ Load Resistor/possible danger ! (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sat, 17 Nov 2007 23:09:53 +0000
No leaks, no hazard. However, I have occasionally borrowed one of the larger Bird loads which had been filled with PCB. When PCBs began to be seen as a problem in the 1980s, a whole batch was scrappe
/archives//html/Amps/2007-11/msg00240.html (10,598 bytes)

218. Re: [Amps] BeO in tubes/tinwhiskers (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Mon, 19 Nov 2007 08:35:02 +0000
The situation in Europe has been bizarre. The electronics industry has made massive R&D efforts to meet the deadlines, but there was no time to look at long-term performance; and there have been no c
/archives//html/Amps/2007-11/msg00270.html (12,288 bytes)

219. Re: [Amps] Grid Protection Circuit for Titan 425 (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Mon, 19 Nov 2007 23:23:36 +0000
They certainly have :-) The information in the user manual for my Triode Board is also free for downloading and use by home constructors. The aim is to protect the amplifier *and* to keep you on the
/archives//html/Amps/2007-11/msg00279.html (9,277 bytes)

220. Re: [Amps] Grid Protection Circuit for Titan 425 (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Tue, 20 Nov 2007 17:22:57 +0000
Have you received my diirect e-mail, Jim? (It was queried by your firewall service.) For an existing amplifier that only needs a few specific improvements, I usually recommend the owner to borrow ide
/archives//html/Amps/2007-11/msg00285.html (9,179 bytes)

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