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References: [ +from:Ian: 2098 ] [ White: 4243 ]

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301. [AMPS] 240VAC Amplifier Wiring (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 15 Nov 2000 15:53:50 +0000; Wherever there are separate neutral and ground conductors, I think the "neutral is only for power, ground is only for grounding" principle does apply. 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book'; /archives//html/Amps/2000-11/msg00167.html (10,180 bytes)
302. [AMPS] Hi Power Connectors (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 22 Nov 2000 07:35:42 +0000; That's certainly true, and of course the UHF connectors are much more "monkey proof" than the N. The SWR problem is not with individual connectors but with multiples. On the back of the radio, the im; /archives//html/Amps/2000-11/msg00289.html (10,658 bytes)
303. [AMPS] Hi Power Connectors (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 22 Nov 2000 07:52:02 +0000; The main problem with both connectors is quality - but in different ways. With the "UHF" the problems is manufacturing quality of the cheaper ones, as Ian says... so buy MIL-spec ones. With N, the ma; /archives//html/Amps/2000-11/msg00290.html (11,713 bytes)
304. [AMPS] Grounds (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 22 Nov 2000 13:37:49 +0000; Rich mentioned a few days ago that these circuit breakers can be subject to RFI. Presumably that would be the voltage-operated type. The 'current trip' (Residual Current Circuit Breaker) has both L a; /archives//html/Amps/2000-11/msg00303.html (9,005 bytes)
305. [AMPS] Hi Power Connectors (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 22 Nov 2000 15:56:17 +0000; All true... of the traditional N connector design which still seems to be very common in the USA. The improved "pressure sleeve" design meets all Tom's objections - except of course for the size of t; /archives//html/Amps/2000-11/msg00315.html (11,904 bytes)
306. [AMPS] Hi Power Connectors (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 23 Nov 2000 13:48:10 +0000; The 450MHz figure feels about right. Perfect connectors are OK to handle a bit more, but you're living on the edge. Since the inner contacts are about the same as N, the rating would be about the sam; /archives//html/Amps/2000-11/msg00340.html (10,222 bytes)
307. [AMPS] DRAKE L-4B bringing back to life ! (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 24 Nov 2000 07:24:11 +0000; No point in telling Rich again, but everybody else please remember that heating graphite to normal tube operating temperatures results in enhanced absorption of gas. 73 from Ian G3SEK Editor, 'The VH; /archives//html/Amps/2000-11/msg00353.html (8,245 bytes)
308. [AMPS] G3SEK changing ISP (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sat, 25 Nov 2000 16:07:53 +0000; We're moving to another Internet service provider. My address and website will remain the same - g3sek@ifwtech.com and http://www.ifwtech.com/g3sek However, for the next few days until your own ISPs'; /archives//html/Amps/2000-11/msg00372.html (7,364 bytes)
309. [AMPS] SB-220 Glitch Resistor ??? (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 28 Nov 2000 07:44:54 +0000; Not cast in stone. Eimac recommend a resistor that would limit the peak short-circuit current out of the power supply to 40A (for tubes up to 1500W dissipation). So for example, if the B+ is 2.5kV, a; /archives//html/Amps/2000-11/msg00394.html (11,026 bytes)
310. SV: [AMPS] SB-220 Glitch Resistor ??? (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 28 Nov 2000 10:39:18 +0000; This keeps on coming around. OE5JFL now has an English-language version of his thyristor crowbar on his own site, with readable schematics: http://www.qsl.net/oe5jfl/flashover.htm That solution is be; /archives//html/Amps/2000-11/msg00396.html (9,221 bytes)
311. SV: [AMPS] SB-220 Glitch Resistor ??? (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 28 Nov 2000 17:42:23 +0000; The main advantage is in reducing the risk to an expensive tube. That's why I haven't got around to building OE5JFL's circuit yet - GS35Bs are cheap! On the other hand, many UHF QRO operators use TV; /archives//html/Amps/2000-11/msg00410.html (11,942 bytes)
312. [AMPS] SB-220 Glitch Resistor ??? (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 28 Nov 2000 17:30:56 +0000; Nobody but you imagined it was. But *some* HV power supplies with high-rated mains fuses will keep going for long enough to burn out the glitch resistor... and then the HV pops up again. 73 from Ian; /archives//html/Amps/2000-11/msg00411.html (10,102 bytes)
313. SV: [AMPS] SB-220 Glitch Resistor ??? (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 29 Nov 2000 07:58:46 +0000; The 10 ohm resistor in the negative return has many of the functions of the glitch resistor, along with the inductor in the B+ lead. Those two components limit the peak surge current, and are also wh; /archives//html/Amps/2000-11/msg00425.html (11,751 bytes)
314. SV: [AMPS] SB-220 Glitch Resistor ??? (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 29 Nov 2000 20:40:41 +0000; You obviously haven't even looked at the circuit we're talking about... or if you have, you haven't understood it. I don't know which alternative is worse. 73 from Ian G3SEK Editor, 'The VHF/UHF DX B; /archives//html/Amps/2000-11/msg00439.html (10,157 bytes)
315. SV: [AMPS] SB-220 Glitch Resistor ??? (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 30 Nov 2000 09:43:08 +0000; Does it? The current around the loop is the same, regardless of whether the glitch resistor is connected to the top of the capacitor stack (B+) or the bottom (B-minus). If we keep chassis potential a; /archives//html/Amps/2000-11/msg00446.html (11,816 bytes)
316. SV: [AMPS] SB-220 Glitch Resistor ??? (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 30 Nov 2000 19:19:13 +0000; You're absolutely right, it won't limit current if you put it there... but that wasn't where I meant. Referring to "Figure 2" on your web site, leave the meters and diodes exactly where they are. Mov; /archives//html/Amps/2000-11/msg00463.html (11,224 bytes)
317. SV: [AMPS] SB-220 Glitch Resistor ??? (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 30 Nov 2000 22:13:42 +0000; The glitch diodes belong in the right-hand group of components, near the meters. There should be NO connection between the left-hand group of components (capacitor stack and HV rectifiers) and ground; /archives//html/Amps/2000-11/msg00469.html (9,246 bytes)
318. [AMPS] Bird meters (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 2 Oct 2000 13:46:46 +0100; FWIW, I measured the current through a Bird 43 meter for a series of indicated power levels (no RF involved, only a DC current source), and threw it all into Excel. Got a nice smooth curve, and Excel; /archives//html/Amps/2000-10/msg00050.html (10,010 bytes)
319. [AMPS] amp project: 4-400s X 4 (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sun, 8 Oct 2000 16:48:00 +0100; Nice idea! You'll definitely need a bleed, because the results of the screen driving current back into a regulated switch-mode supply might be a little, er, unpredictable. One problem is that a volta; /archives//html/Amps/2000-10/msg00124.html (10,115 bytes)
320. [AMPS] Switches (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 13 Oct 2000 07:34:51 +0100; I wouldn't say that the screen supply in the 91/99B is well regulated (only zeners) so that amp doesn't necessarily show us the best IMD performance the 4CX800 is capable of. Likewise Eimac's recomme; /archives//html/Amps/2000-10/msg00273.html (10,443 bytes)

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