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201. [AMPS] Two Tone 2000 (score: 1)
Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK)
Date: Wed, 6 Dec 2000 00:07:54 +0000
If you're pulsing the composite signal, it would be important to have a range of rates to test the effects on power supply regulation. Probably 1Hz, 10Hz and 100Hz would be enough, and 50% duty cycle
/archives//html/Amps/2000-12/msg00087.html (8,793 bytes)

202. [AMPS] Ian White's URL (Pi/PI-L spreadsheet) (score: 1)
Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK)
Date: Sun, 10 Dec 2000 19:38:32 +0000
Sorry, I go away for 24 hours and look what happens... Please be aware that this project is "under construction". There are no outright errors, as far as I'm aware, but you do need to know how to use
/archives//html/Amps/2000-12/msg00182.html (7,563 bytes)

203. [AMPS] ARRL CD rom question (score: 1)
Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK)
Date: Mon, 18 Dec 2000 07:46:50 +0000
They vary. author/date search. Browse facilities were poor, and they made no use of the existing classified annual index. Text and picture quality is about as good as a fax. MS Windows only. readers.
/archives//html/Amps/2000-12/msg00266.html (8,232 bytes)

204. [AMPS] DC Filaments??? (score: 1)
Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK)
Date: Thu, 2 Nov 2000 08:01:25 +0000
In a push-pull stereo system, you MUST periodically swap the tubes around - left to right, push to pull - in order to even out the wear. Incorrect adjustment of the stereo balance can cause premature
/archives//html/Amps/2000-11/msg00018.html (9,133 bytes)

205. [AMPS] DC Filaments??? (score: 1)
Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK)
Date: Thu, 2 Nov 2000 16:36:03 +0000
To coin a phrase: [chortle]! 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 S
/archives//html/Amps/2000-11/msg00030.html (9,209 bytes)

206. [AMPS] Glitch protection (score: 1)
Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK)
Date: Fri, 3 Nov 2000 07:35:51 +0000
[lots of ingenious stuff] Quite so. The ultimate test is to see whether you can crowbar the HV supply with another very thin fuse wire and have that wire NOT blow before the supply is shut down. For
/archives//html/Amps/2000-11/msg00044.html (8,289 bytes)

207. [AMPS] Two Tone 2000 (score: 1)
Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK)
Date: Tue, 7 Nov 2000 13:50:52 +0000
That sounds like a great idea, especially for those of us who don't have facilities for a two-signal test using separate CW transmitters. A number of people have suggested "three-tone" testing, but I
/archives//html/Amps/2000-11/msg00085.html (9,161 bytes)

208. [AMPS] advice on and old SB-220 (score: 1)
Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK)
Date: Sat, 11 Nov 2000 08:11:53 +0000
Quite right, no miracles are involved. If a transmitting tube like a 3-500Z that has been in store for a long time is found to be "gassy", the possibilities for recovery depend on where the gas came
/archives//html/Amps/2000-11/msg00105.html (9,350 bytes)

209. SV: [AMPS] advice on an old SB-220 (score: 1)
Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK)
Date: Sat, 11 Nov 2000 08:35:19 +0000
Small-signal tubes are gettered by a chemically reactive metal film (usually barium, mostly) on the inside of the glass. You can see the "silver" film inside, usually at the top. This operates at low
/archives//html/Amps/2000-11/msg00106.html (12,718 bytes)

210. [AMPS] advice on and old SB-220 (score: 1)
Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK)
Date: Mon, 13 Nov 2000 17:04:17 +0000
That's like saying "heating causes your house to burn down". Heating causes *all* tube materials to release stored gas, if the temperature is high enough. That's why they are heated during manufactur
/archives//html/Amps/2000-11/msg00127.html (9,031 bytes)

211. [AMPS] 240VAC Amplifier Wiring (score: 1)
Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK)
Date: Wed, 15 Nov 2000 07:38:59 +0000
There are two sides to separating neutral from ground. One is in the mains supply and cable, but the other is in the equipment. The rule is that "neutral is only for power", and "ground is only for g
/archives//html/Amps/2000-11/msg00150.html (10,784 bytes)

212. [AMPS] 240VAC Amplifier Wiring (score: 1)
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)

213. [AMPS] Hi Power Connectors (score: 1)
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)

214. [AMPS] Hi Power Connectors (score: 1)
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)

215. [AMPS] Grounds (score: 1)
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)

216. [AMPS] Hi Power Connectors (score: 1)
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)

217. [AMPS] Hi Power Connectors (score: 1)
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)

218. [AMPS] DRAKE L-4B bringing back to life ! (score: 1)
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)

219. [AMPS] G3SEK changing ISP (score: 1)
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)

220. [AMPS] SB-220 Glitch Resistor ??? (score: 1)
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)

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