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281. [AMPS] Re: (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 19 May 1998 07:16:51 +0100; Hey, no fair, no fair!!! 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.demon.co.uk/g3sek -- FAQ on WWW: http://www.contesting.com/ampfaq; /archives//html/Amps/1998-05/msg00343.html (8,946 bytes)
282. [AMPS] Re: (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 20 May 1998 17:13:11 +0100; Either you have failed to understand my postings over the weekend, or you are deliberately misrepresenting them... or maybe both. The transformation will not work for pure resistance, and it is not c; /archives//html/Amps/1998-05/msg00395.html (8,857 bytes)
283. [AMPS] Re: Parasitics (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 20 May 1998 17:03:59 +0100; I mean the same as the textbooks mean, and the same as Wes Stewart meant, namely: when the whole network is considered as a single equivalent resistance and a single equivalent reactance in parallel,; /archives//html/Amps/1998-05/msg00396.html (10,490 bytes)
284. [AMPS] Stability (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 21 May 1998 08:24:33 +0100; There's a button somewhere on your fancy HP Network Analyzer that will plot a sweep of Linvill's K. It's used all the time in trying to design unconditionally stable lownoise amplifiers. If you think; /archives//html/Amps/1998-05/msg00419.html (7,921 bytes)
285. [AMPS] Re: Parasitics (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 21 May 1998 07:56:18 +0100; Wouldn't it be more logical to ask *why* the electronic protection shorts during a major fault, and fix that problem? Removing the electronic protection means there is NO protection against lesser fa; /archives//html/Amps/1998-05/msg00420.html (10,342 bytes)
286. [AMPS] Re: Parasitics (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 21 May 1998 08:15:27 +0100; ^^^^^^ ^ ^ That's where it all goes wrong. What you have just described are Rs and Xs, where s stands for SERIES-equivalent. As I showed in the earlier posting that analysed a typical line in Wes's t; /archives//html/Amps/1998-05/msg00421.html (9,987 bytes)
287. [AMPS] Re: Parasitics (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 21 May 1998 19:45:59 +0100; Oh my... have you really believed for all this time that the "s" in "Rs" stands for "suppressor"? Copied and pasted directly from Wes's own page: "the measured effective (series) inductance". In othe; /archives//html/Amps/1998-05/msg00441.html (9,962 bytes)
288. [AMPS] parasitics (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 21 May 1998 20:03:47 +0100; How much damage should you expect? I don't know. Nobody has come up with a real explanation of how the forces necessary to bend a filament are generated, applying the same principles as an electric m; /archives//html/Amps/1998-05/msg00442.html (9,807 bytes)
289. [AMPS] bent filament calculation (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Fri, 22 May 1998 07:34:46 +0100; [...] Brilliant! All that engineering information *and* a brand-new word, "ponderomotive". Thank you for the extended abstract, John. Please could you e-mail the fullest possible reference to the pap; /archives//html/Amps/1998-05/msg00470.html (7,604 bytes)
290. [AMPS] Re: Parasitics (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Fri, 22 May 1998 15:09:44 +0100; OK! Rather than use "s" at all (which could still be confusing), could I propose simply "R" and "L", AKA "the resistor" and "the inductor". Remember that the Impedance Meter can only measure the *eff; /archives//html/Amps/1998-05/msg00482.html (11,456 bytes)
291. [AMPS] Sealing of RF chamber (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sat, 23 May 1998 09:06:00 +0100; Screws are fine, unless the blower performance is marginal. Using silicone is liable to spoil the RF shielding because it means that the screws themselves are the only contact between the box and the; /archives//html/Amps/1998-05/msg00519.html (9,519 bytes)
292. [AMPS] Airflow (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sat, 23 May 1998 09:18:41 +0100; The only major problem I can think of is the difficulty of getting the hot air out, without heating the whole box, the output tuned circuit and the base of the tube in particular. The cooling of the; /archives//html/Amps/1998-05/msg00520.html (8,188 bytes)
293. [AMPS] Air Sealing of RF chamber (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sun, 24 May 1998 09:16:18 +0100; Ooops - sorry! I forgot that "real hams" don't use air cooling. Seriously, thanks very much for the information, John. In a few years it will all be available on the web, but right now it's very valu; /archives//html/Amps/1998-05/msg00541.html (7,764 bytes)
294. [AMPS] Amplifier Experiments! (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 25 May 1998 08:24:40 +0100; If you connect the resistor to an MFJ-259 and some kind of jig to minimize the inductance of the leads, and then "sweep" the frequency up into the VHF range, the "Resistance" scale should give some i; /archives//html/Amps/1998-05/msg00563.html (9,427 bytes)
295. [AMPS] More amplifier experiments (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Fri, 29 May 1998 18:45:40 +0100; That's true, but the effective values of R and L will vary with frequency, so you need to check the behavior of the network at both VHF and HF. Above all you need to either make measurements or plug; /archives//html/Amps/1998-05/msg00657.html (11,876 bytes)
296. [AMPS] RCA 7213 (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 1 Apr 1998 22:58:33 +0100; Your classic az-el indicator circuit is still working fine here, Larry. Problem is that the total grid current divides heavily in favor of the control grid, but you can't actually measure the split.; /archives//html/Amps/1998-04/msg00006.html (9,010 bytes)
297. [AMPS] ARCING MORE (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 15 Apr 1998 23:04:42 +0100; That's probably true. Replacing the plates is probably necessary, but it's only treating a symptom. It isn't treating the root cause. Something, somewhere changed from the way it was before. That's w; /archives//html/Amps/1998-04/msg00102.html (8,608 bytes)
298. [AMPS] parasitics (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Fri, 24 Apr 1998 11:42:41 +0100; A metal bandswitch knob and insulating shaft bushes would probably do it. 73 from Ian G3SEK -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative reques; /archives//html/Amps/1998-04/msg00248.html (8,886 bytes)
299. [AMPS] parasitics (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Fri, 24 Apr 1998 11:30:57 +0100; It was Wes Stewart, N7WS. He made comparative measurements between samples of Rich's suppressors and some normal-design ones provided by W8JI. AFAIK the raw measurements are still on Rich's web pages; /archives//html/Amps/1998-04/msg00249.html (9,644 bytes)
300. [AMPS] parasitics (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sat, 25 Apr 1998 00:46:48 +0100; There is quite a lot of experimental evidence, so we ought to be well beyond hypotheses and into the theory stage. Parasitics that can be made to occur continuously have been well understood for a ve; /archives//html/Amps/1998-04/msg00267.html (10,404 bytes)

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