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Total 471 documents matching your query.

181. Re: [Amps] EIMAC (8877 TYPE) (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sun, 21 Jan 2007 13:22:26 +0000
Hello Lou Yes, Lou, I have no dispute with you about that. I was responding to someone else's statement that "experience trumps theory, every time". Experience shows, that ain't so. -- 73 from Ian GM
/archives//html/Amps/2007-01/msg00211.html (8,641 bytes)

182. Re: [Amps] Reliant 103 Amp (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sun, 21 Jan 2007 21:23:44 +0000
Sorry, John... can't stop laughing... it's just that, in the UK, the name "Reliant" is associated with a different kind of technology: http://tinyurl.com/9zc36 -- 73 from Ian GM3SEK _________________
/archives//html/Amps/2007-01/msg00219.html (6,677 bytes)

183. Re: [Amps] Water Types (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Tue, 6 Feb 2007 22:18:29 +0000
Sorry, that's completely wrong - you're confusing ions (same nucleus, different number of electrons) with isotopes (different number of neutrons in the nucleus). Ordinary H2O is electrically neutral,
/archives//html/Amps/2007-02/msg00100.html (9,016 bytes)

184. [Amps] Welcome back (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Wed, 7 Feb 2007 07:38:18 +0000
Newer readers may not be aware that, about a decade ago, people like Dick Ehrhorn, John Brosnahan, John Lyles and various Eimac employees were regular contributors to AMPS. Their expertise and specif
/archives//html/Amps/2007-02/msg00112.html (7,617 bytes)

185. Re: [Amps] Switching PS for filaments? (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sun, 18 Feb 2007 10:45:33 +0000
Voltage ramping can sometimes be as simple as "slugging" one side of the master potential divider with a large electrolytic, but it still doesn't guarantee that the switcher will allow itself to star
/archives//html/Amps/2007-02/msg00268.html (8,218 bytes)

186. Re: [Amps] High Power (2500 Watts) Bird RF Dummy Load For Sale (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Mon, 19 Feb 2007 07:54:22 +0000
A drastic but effective method is to cover the max power potentiometer with epoxy. (The rig doesn't deserve it, but the owner does.) A more sneaky trick is to leave him the pot to play with, but moun
/archives//html/Amps/2007-02/msg00290.html (8,726 bytes)

187. Re: [Amps] Getting rid of blower noise - an alternate coolingscheme using the phase transition of liquid carbon dioxide (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Wed, 21 Feb 2007 16:38:44 +0000
The first symptoms of elevated CO2 levels are panting and feelings of anxiety. When the victim is sitting in front of the radio, these symptoms are easily mistaken for pileup fever. Even in cases lea
/archives//html/Amps/2007-02/msg00344.html (8,061 bytes)

188. Re: [Amps] Edge wound inductors (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Wed, 28 Feb 2007 08:36:40 +0000
Isn't it mostly about being able to make a really good sliding contact to the two flat sides? -- 73 from Ian GM3SEK _______________________________________________ Amps mailing list Amps@contesting.c
/archives//html/Amps/2007-02/msg00411.html (7,026 bytes)

189. Re: [Amps] Old Power Cord (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Tue, 6 Mar 2007 08:46:02 +0000
Let's be careful here. "All grounds within a building," as stated above, seems rather too sweeping. I had understood the requirement in the USA to be as stated by W8JI last night: "NEC prohibits mult
/archives//html/Amps/2007-03/msg00108.html (9,979 bytes)

190. Re: [Amps] MOVs on HV PS (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Tue, 6 Mar 2007 13:58:26 +0000
Was that the one where they kept all the old-style wiring between live and chassis, connected the chassis to neutral, and "grounded" the whole thing through bypass capacitors? It didn't last long in
/archives//html/Amps/2007-03/msg00111.html (8,184 bytes)

191. Re: [Amps] PSUD from Duncan Amps (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Thu, 15 Mar 2007 22:31:45 +0000
The minimum voltage will the lowest value at any time. If the time span includes switch-on from zero, then for sure the reported minimum value will look low. The answer is to use the program's "repor
/archives//html/Amps/2007-03/msg00173.html (7,307 bytes)

192. Re: [Amps] AMP Reflector Quality of Information (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Tue, 20 Mar 2007 15:52:32 +0000
For the record, there are *two* Yahoo amplifiers groups "related" to this AMPS mailing list (along with several others that are not). 1. http://groups.yahoo.com/group/ham_amplifiers/ Founded: Sep 8,
/archives//html/Amps/2007-03/msg00252.html (9,144 bytes)

193. Re: [Amps] Amp Supply LK500-zc tube asymmetry (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Wed, 21 Mar 2007 15:15:37 +0000
To expand on last night's comments from Tom W8JI : This kind of "glitch" is a big surge of current, out of the power supply and through the rest of the amplifier. For this discussion we don't need to
/archives//html/Amps/2007-03/msg00280.html (12,794 bytes)

194. Re: [Amps] Surge resistor (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Wed, 21 Mar 2007 18:57:06 +0000
Along with several other well-documented possibilities, including sporadic releases of gas into the vacuum inside the tube, microscopic 'whiskers' of metal inside the tube, stray hairs or insects out
/archives//html/Amps/2007-03/msg00287.html (9,461 bytes)

195. Re: [Amps] Bee's wax to hold screws (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 23 Mar 2007 07:38:27 +0000
Blu-Tack, superglue - whatever it takes. -- 73 from Ian GM3SEK 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.co.uk/g3sek _______________________________________________ Amps mailing li
/archives//html/Amps/2007-03/msg00312.html (8,781 bytes)

196. Re: [Amps] Tank Coil spacing (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Mon, 26 Mar 2007 17:32:23 +0100
There are some interesting measurements on G4AXX's website, at: http://granta.g4axx.com/Linear_design_notes.php3 For that particular amplifier, the harmonic levels on various bands ranged from -45dBc
/archives//html/Amps/2007-03/msg00346.html (8,272 bytes)

197. Re: [Amps] Tank Coil spacing (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Mon, 26 Mar 2007 23:56:35 +0100
We have a different regulation in the UK, based on the concept of "undue interference". Peter is the professional expert on exactly what the magic word "undue" is supposed to mean... but in practice
/archives//html/Amps/2007-03/msg00352.html (8,839 bytes)

198. Re: [Amps] 8877 blower requirement ? (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 6 Apr 2007 16:02:01 +0100
Umm, beg to differ. What actually provides the heat transfer is the mass flow rate of air (grams per second) and its specific heat. Unfortunately the mass flow rate of a gas is very difficult to meas
/archives//html/Amps/2007-04/msg00020.html (10,756 bytes)

199. Re: [Amps] 8877 blower requirement ? (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 6 Apr 2007 19:05:28 +0100
Sorry, I misread your previous posting as referring to the CFM rating of the tube, not the blower. Very much agree about the CFM rating of the blower being of little use. It is the maximum output wit
/archives//html/Amps/2007-04/msg00022.html (9,987 bytes)

200. Re: [Amps] RE : ?amp hardware (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Wed, 11 Apr 2007 08:23:05 +0100
Be very cautious about using hank/rivet/PEM nuts as a repair for existing equipment. They are the kind of technique that works best in a factory situation, where everything can be set up just right,
/archives//html/Amps/2007-04/msg00077.html (9,184 bytes)

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