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341. [AMPS] The Emtron DX2 amp: A 50ohm 50 Watt resistor in B+? (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Fri, 17 Oct 1997 09:49:22 +0100; For tubes up to about 1500W dissipation, Eimac recommend a resistor that will limit the absolute maximum surge current to 40A. For a 2kV supply, 50 ohms is spot-on. The 50W rating is partly for power; /archives//html/Amps/1997-10/msg00103.html (9,982 bytes)
342. [AMPS] Silver plating (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 3 Sep 1997 21:38:01 +0100; This was thrashed through in r.r.a.antannas/homebrew (I forget which) several months ago. There was a lot of discussion about the chemical form of the oxidized surface layer on silver and on copper,; /archives//html/Amps/1997-09/msg00061.html (8,580 bytes)
343. [AMPS] Conjugate match (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 3 Sep 1997 21:29:33 +0100; ARRL has done quite a good job of purging the term "output impedance" from the PA chapters of the Handbook, in favor of talking about the "optimum load impedance" that the PA wants to look into. Howe; /archives//html/Amps/1997-09/msg00062.html (9,257 bytes)
344. [AMPS] Conjugate match (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 4 Sep 1997 07:37:15 +0100; I'll look forward to reading your article, and then reply. Probably we agree quite closely, except perhaps about the use of certain words. 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice; /archives//html/Amps/1997-09/msg00081.html (8,658 bytes)
345. [AMPS] silver plate (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 4 Sep 1997 19:22:03 +0100; Only if the atmosphere was at a few millibars pressure and consisted mainly of excited atoms and free radicals. The rest of my chemistry knowledge has been sublimated into cooking - you get to eat th; /archives//html/Amps/1997-09/msg00087.html (7,311 bytes)
346. [AMPS] two questions (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sat, 6 Sep 1997 08:43:25 +0100; A number of VHF mountain-toppers are using modified computer switch-mode supplies for 6V heaters, to avoid problems with generator sags and surges. Apparently the fully-enclosed and filtered units wo; /archives//html/Amps/1997-09/msg00117.html (8,766 bytes)
347. [AMPS] two questions (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sun, 7 Sep 1997 09:06:11 +0100; Good point - the applications I was thinking about were all groundedcathode. Most switchers are not specifically designed to float far from chassis potential (if at all). 73 from Ian G3SEK Editor, 'T; /archives//html/Amps/1997-09/msg00137.html (8,277 bytes)
348. [AMPS] Linear with 4CX800A (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 8 Sep 1997 19:36:36 +0100; I should think there would be enormous interest! Having just written an article that tries to go into that depth of detail for just one part of an amplifier - the screen supply - I've learned just ho; /archives//html/Amps/1997-09/msg00176.html (9,358 bytes)
349. [AMPS] RE:two questions (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 9 Sep 1997 07:18:04 +0100; To be fair, N7WS' own rather different interpretation is published at http://www.azstarnet.com/~n7ws 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://w; /archives//html/Amps/1997-09/msg00185.html (9,572 bytes)
350. [AMPS] RE:two questions (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 9 Sep 1997 19:39:41 +0100; To be fair to both sides (now there's a novel idea!) Wes originally supplied only the data without comment, and didn't offer his own interpretation until AFTER Rich had produced his. 73 from Ian G3S; /archives//html/Amps/1997-09/msg00211.html (9,654 bytes)
351. [AMPS] impedance of nichrome lower (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 11 Sep 1997 08:46:57 +0100; Not true, as DejaNews would show, but I'll bite again. The N7WS measured Rp and Lp values for Rich's suppressor at 100MHz are Rp = 103.2 ohms, Lp = 123.9nH. With ideal components, those are the R and; /archives//html/Amps/1997-09/msg00240.html (11,430 bytes)
352. [AMPS] Bulletproof (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 11 Sep 1997 18:59:04 +0100; I have the schematic, but unfortunately not the amplifier :-) There is a small inductor switched in series with the 50-ohm input for 24 and 28MHz, but it isn't connected between the grid resistor and; /archives//html/Amps/1997-09/msg00255.html (9,059 bytes)
353. [AMPS] impedance of nichrome lower (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Fri, 12 Sep 1997 07:14:10 +0100; Maybe... but it isn't directly relevant to this thread which is basically about the network itself, not how you'd use it. As far as I remember, the suppressors were supplied to Wes by Rich and by Tom; /archives//html/Amps/1997-09/msg00263.html (11,190 bytes)
354. [AMPS] Re: de-toxified dihydrogen monoxide (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Fri, 12 Sep 1997 19:03:49 +0100; Cellar temperature, actually - in the pubs that still have one. We just don't like our beer paralyzed. Thank goodness for that! Ice is the solid form of that proven toxic substance. BTW, another way; /archives//html/Amps/1997-09/msg00284.html (7,873 bytes)
355. [AMPS] Re: de-toxified dihydrogen monoxide (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sat, 13 Sep 1997 08:30:33 +0100; For reasons of economy my ancestors distribute Whisky as the concentrate. 1:1 is how the GMs like it, to amplify the flavour (see, Bill, I got the magic word in!) ^^^^^^^ 73 from Ian G3SEK -- FAQ on; /archives//html/Amps/1997-09/msg00287.html (7,601 bytes)
356. [AMPS] Continuously variable power attenuator? (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 18 Sep 1997 07:29:18 +0100; I'm looking for ideas for a continuously variable power attenuator capable of handling 10-20W at 144MHz. Minimum insertion loss can be a dB or two, maximum only needs to be about 10dB. The impedance; /archives//html/Amps/1997-09/msg00317.html (7,220 bytes)
357. [AMPS] L-4B grid ckt shorts (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sat, 20 Sep 1997 22:15:31 +0100; Much more likely it was an intermittent short from HV+ to chassis. This would find its way back to HV- through the 1 ohm resistor. It would indicate as "grid current" - lots of it - but you'd see exa; /archives//html/Amps/1997-09/msg00330.html (9,573 bytes)
358. [AMPS] L-4B grid ckt shorts (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sun, 21 Sep 1997 17:06:25 +0100; I honestly don't know. But... how could an oscillation produce enough grid current - GRID current, not cathode current - to burn out a resistor that is rated to carry 10A continuously? 73 from Ian G3; /archives//html/Amps/1997-09/msg00337.html (8,636 bytes)
359. [AMPS] L-4B grid ckt shorts (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sun, 21 Sep 1997 22:49:35 +0100; I beg your pardon: make that 3-and-a-bit amps continuously, for a 1-ohm, 10W resistor. Therefore whatever current burned that resistor out was The same conclusion still applies, though. It seems incr; /archives//html/Amps/1997-09/msg00345.html (8,851 bytes)
360. [AMPS] Grid Swamping resistor for 4CX250B (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 30 Sep 1997 19:26:03 +0100; Grid swamping is usually an HF or VHF technique, but it should not be needed with 4CX250Bs at 432MHz. For example, the K2RIW stripline PA uses no grid swamping and is quite stable with the correct so; /archives//html/Amps/1997-09/msg00398.html (9,304 bytes)

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