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141. [AMPS] DJ5RE 2m Amplifier Tuning - Longish (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sun, 20 May 2001 09:28:41 +0100; To: <amps@contesting.com> Sorry I wasn't available to come back to Phil yesterday. Significant grid current in a GS35b at idle current seems very unusual. Assuming there is no deliberate RF drive and; /archives//html/Amps/2001-05/msg00366.html (9,858 bytes)
142. [AMPS] Conjugate Matching and Efficiency (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sun, 27 May 2001 13:25:25 +0100; I don't think it's a matter for "correction", but of several equivalent viewpoints. Since they are all analysing the same reality, all of these viewpoints MUST agree. Any one of them can be used to c; /archives//html/Amps/2001-05/msg00454.html (12,161 bytes)
143. [AMPS] Sucking instead of Blowing (was - This guy is gotta be kidding!) (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sun, 27 May 2001 15:21:19 +0100; Can you remind us where the markings are in those two amps, for each of the tubes, in relation to the 'upstream' side? (Just wondering how much difference that makes.) 73 from Ian G3SEK Editor, 'The; /archives//html/Amps/2001-05/msg00458.html (9,204 bytes)
144. [AMPS] Conjugate Matching and Efficiency (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sun, 27 May 2001 15:18:40 +0100; I should have said that all alternative viewpoints that are correctly applied - *if* they can be correctly applied at all - must give consistent results. Exactly! Basic circuit theory says that Norto; /archives//html/Amps/2001-05/msg00459.html (11,826 bytes)
145. [AMPS] Sucking instead of Blowing (was - This guy is gotta be kidding!) (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sun, 27 May 2001 21:24:11 +0100; Yes, I'm aware that happens - but what that party trick demonstrates is that at *low* velocities the airflow remains attached to the surface and flows smoothly around it to join up again at the far s; /archives//html/Amps/2001-05/msg00462.html (10,508 bytes)
146. [AMPS] Sucking instead of Blowing (was - This guy is gotta be kidding!) (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 28 May 2001 12:56:14 +0100; I do indeed trust you, Phil - that's exactly why I was asking about this. Yes, I've seen Rich's article, and there's absolutely no doubt that (a) the SB-220 cooling system was very carefully thought; /archives//html/Amps/2001-05/msg00478.html (10,634 bytes)
147. [AMPS] Sucking instead of Blowing (was - This guy is gotta be kidding!) (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 28 May 2001 09:11:24 +0100; All practical cooling fans create turbulence. It's easy to check with a streamer of smoke. Thank you - that's the information I was asking for. Can you confirm that the ink is on the opposite side fr; /archives//html/Amps/2001-05/msg00479.html (10,365 bytes)
148. [AMPS] Sucking instead of Blowing (was - This guy is gotta be kidding!) (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 28 May 2001 22:28:24 +0100; And that is because...? 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.com/g3sek -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submis; /archives//html/Amps/2001-05/msg00482.html (9,135 bytes)
149. [AMPS] Floating Ground (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 4 Apr 2001 13:22:34 +0100; Although the article is associated with a specific commercial product, the general points are valid for all triode amplifiers. 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist; /archives//html/Amps/2001-04/msg00067.html (7,687 bytes)
150. [AMPS] ALPHA 77SX on 50Hz (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 6 Apr 2001 07:54:29 +0100; Interesting figures... so the total weight of the transformer increases as something like the square of the core cross-sectional area. Seems about right. And then the capacity of a blower with an AC; /archives//html/Amps/2001-04/msg00132.html (9,312 bytes)
151. [AMPS] ALPHA 77SX on 50Hz (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 6 Apr 2001 16:35:08 +0100; My "seems about right" was based on the notion that although the core cross-section would only need to be 20% larger, a core built from standard off-the-shelf laminations would probably be larger in; /archives//html/Amps/2001-04/msg00145.html (9,850 bytes)
152. [AMPS] MLA2500 and screen voltage for 4CX800. (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 11 Apr 2001 16:10:41 +0100; John did the measurements and faxed me the screen dumps. I prepared the bar charts and the web page on my site. A few additional points: 1. The "need" for good screen regulation will depend on the ty; /archives//html/Amps/2001-04/msg00254.html (12,671 bytes)
153. [AMPS] Zener screen supplies (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 13 Apr 2001 08:46:21 +0100; [...] You can't generalize either way on the basis of complexity alone. Complex circuits can offer design opportunities that don't exist in simple circuits; but they also have more to go wrong. In th; /archives//html/Amps/2001-04/msg00300.html (12,570 bytes)
154. [AMPS] Zener screen supplies (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 13 Apr 2001 19:53:54 +0100; My, you must have led a sheltered life... 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.com/g3sek -- FAQ on WWW: http://www.contesting.c; /archives//html/Amps/2001-04/msg00302.html (9,145 bytes)
155. [AMPS] Zener screen supplies (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sat, 14 Apr 2001 14:43:49 +0100; The MOV or gas tube at the screen terminal is actually the *first* line of defense because that is where the arc hits. Tom correctly identifies that the screen bypass capacitor in the socket is at le; /archives//html/Amps/2001-04/msg00324.html (11,731 bytes)
156. [AMPS] Zener screen supplies (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sat, 14 Apr 2001 22:10:42 +0100; Not true, on two counts. 1. Sometimes the arc is due to an RF problem external to the tube, such as a high SWR. 2. Sometimes the arc isn't any kind of RF problem at all. Many of mine have been due to; /archives//html/Amps/2001-04/msg00343.html (10,852 bytes)
157. [AMPS] Zener screen supplies (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 16 Apr 2001 10:01:13 +0100; We are talking about power supplies, and the power supply doesn't care where the arc is. Only after you have provided a cathode bypass capacitor and re-wired the entire power supply. Although DC grou; /archives//html/Amps/2001-04/msg00361.html (11,383 bytes)
158. [AMPS] Zener screen supplies (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 16 Apr 2001 09:42:24 +0100; I see what you mean now. Oh, that one... sure, you always need that. I thought you meant another impedance between the screen and the screen supply, which would help to protect the supply. That may w; /archives//html/Amps/2001-04/msg00362.html (11,010 bytes)
159. [AMPS] Zener screen supplies (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 16 Apr 2001 15:12:45 +0100; Enough of these non-standard units! The last time I used the arc method to measure the length of the gap on a 4CX250, it was 1.0 earwig. 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice'; /archives//html/Amps/2001-04/msg00369.html (9,906 bytes)
160. [AMPS] Zener screen supplies (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 17 Apr 2001 11:23:22 +0100; Assuming that the arc strikes extremely rapidly, the rise time is going to be of the order of RC, where R is the glitch resistor and C is the bypass capacitance. That comes out to a few tens of nanos; /archives//html/Amps/2001-04/msg00387.html (10,190 bytes)

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