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Total 471 documents matching your query.

161. Re: [Amps] Is Amps still in existence? (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Mon, 9 Oct 2006 23:17:58 +0100
You all notice how he places that on public record? Very well, then - to be collected at our "local": http://tinyurl.com/netn6 -- 73 from Ian GM3SEK _______________________________________________ Am
/archives//html/Amps/2006-10/msg00075.html (8,513 bytes)

162. Re: [Amps] "10 Meter Ban" to be lifted ... (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sun, 15 Oct 2006 10:02:44 +0100
Wasn't there also an FCC rule that the time constant of the meter should not be greater than 0.25 seconds? How an FCC field engineer could have checked that was left to the reader's imagination. -- 7
/archives//html/Amps/2006-10/msg00133.html (10,541 bytes)

163. Re: [Amps] PEP power.. (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Mon, 16 Oct 2006 10:29:48 +0100
It is also how "PEP" is legally defined in the US and UK licences, and probably in many others. Note that the word "peak" applies to the modulation envelope - NOT the RF power! Your RF power is defin
/archives//html/Amps/2006-10/msg00162.html (7,536 bytes)

164. Re: [Amps] FW: PEP power.. (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Mon, 16 Oct 2006 16:31:08 +0100
No, it's a complete fallacy. -- 73 from Ian GM3SEK 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.co.uk/g3sek _______________________________________________ Amps mailing list Amps@cont
/archives//html/Amps/2006-10/msg00176.html (6,826 bytes)

165. Re: [Amps] Testing amp with no air flow (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Thu, 19 Oct 2006 14:17:38 +0100
I can't answer that question directly, but how about stretching clear Saran wrap over the base of the chassis? It balloons up alarmingly, but it keeps the air in, lets you see what you're doing, and
/archives//html/Amps/2006-10/msg00196.html (8,320 bytes)

166. Re: [Amps] Testing amp with no air flow (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 20 Oct 2006 07:43:33 +0100
In what way marginal? The recommendation was actually to "stretch clear Saran wrap over the base of the chassis," but maybe I should also have added: Seal. It. Down. With. Tape. It's 100% effective.
/archives//html/Amps/2006-10/msg00211.html (8,467 bytes)

167. Re: [Amps] Smith Chart Software (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Mon, 23 Oct 2006 07:25:10 +0100
Try "Smith" from Prof Fritz Dellsperger at Bern University of Applied Sciences, Switzerland. The demo version is at: http://www.fritz.dellsperger.net/downloads.htm There's lots more tutorial material
/archives//html/Amps/2006-10/msg00238.html (7,313 bytes)

168. Re: [Amps] Henry 3K trouble (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Wed, 1 Nov 2006 16:55:57 +0000
This diode is meant to handle the current surge, not be destroyed by it. Many older amps use "1-amp" diodes like the 1N4001-4007 series, which don't have a high enough surge current rating. The repla
/archives//html/Amps/2006-11/msg00011.html (8,452 bytes)

169. Re: [Amps] 4CX1500 class AB1 vs. AB2 (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Thu, 2 Nov 2006 08:02:00 +0000
The manufacturers recommend these tubes are used with an ALC system to keep them in class AB1. However, the most practical way to derive the ALC signal is to detect the grid current that starts to fl
/archives//html/Amps/2006-11/msg00032.html (8,923 bytes)

170. Re: [Amps] FW: Zener Bias Replacement (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Tue, 7 Nov 2006 23:37:50 +0000
Sorry, I'm pushed for time at the moment, and unable to reply in great detail. The circuit for a high-power 'adjustable zener' comes straight from the TL431 data sheet. Both WD7S and I have used it i
/archives//html/Amps/2006-11/msg00114.html (9,366 bytes)

171. Re: [Amps] pi filter QBL 5/3500 (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Tue, 7 Nov 2006 23:46:37 +0000
The original G2DAF articles are archived on my website, should anyone wish to read them. G2DAF's own 2x 4-125 amplifier was left to the RSGB Museum. By the end of his life, the screen rectifiers had
/archives//html/Amps/2006-11/msg00115.html (7,887 bytes)

172. [Amps] FS: GM3SEK Triode and Tetrode Boards and Kits (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Mon, 13 Nov 2006 22:12:24 +0000
GM3SEK's Triode and Tetrode Boards can now be ordered online, direct from me, at: www.ifwtech.co.uk/g3sek/boards Products available are: * Triode Board * Tetrode Boards * Tetrode Boards KIT - boards
/archives//html/Amps/2006-11/msg00160.html (7,228 bytes)

173. [Amps] FS: Triode Board KIT now available (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 17 Nov 2006 17:45:31 +0000
All the Triode and Tetrode Board products are now available online from our own store: http://www.ifwtech.co.uk/g3sek/boards/boardshop.htm To those who've been waiting: thanks for your patience! -- 7
/archives//html/Amps/2006-11/msg00221.html (6,653 bytes)

174. [Amps] WTB: 9-position bandswitch wafers (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sun, 31 Dec 2006 09:23:46 +0000
Please can anyone suggest a source for some 9-position ceramic bandswitch wafers, large enough to handle a GS35B in RTTY duty cycles, with progressive shorting and 30deg indexing? This will be a retr
/archives//html/Amps/2006-12/msg00235.html (7,139 bytes)

175. Re: [Amps] *** SPAM *** Re: Alpha 87a (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Tue, 2 Jan 2007 21:10:07 +0000
That can only happen if either the cable, the SWR meter, the transmitter, the ATU or a dummy load has a substantial break in its shielding. Without any of those, the indicated SWR is not affected by
/archives//html/Amps/2007-01/msg00028.html (9,495 bytes)

176. Re: [Amps] Tom's Tubes ... (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Tue, 9 Jan 2007 23:46:51 +0000
Agreed, in every detail. Tom was the US distributor for my Triode and Tetrode Boards, and was always completely straightforward and trustworthy. Although we were often in contact by e-mail and the ph
/archives//html/Amps/2007-01/msg00082.html (7,461 bytes)

177. Re: [Amps] What am I missing? (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sat, 13 Jan 2007 06:05:50 +0000
There are a few Eimac Application Bulletins on the web, at: http://www.cpii.com/eimac/eiapps.htm along with other useful information and a limited FAQ. * AB5 - Eimac Tube Performance Computer * AB16
/archives//html/Amps/2007-01/msg00115.html (8,510 bytes)

178. Re: [Amps] RK65/5D23 tetrode (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sat, 13 Jan 2007 13:43:59 +0000
Also "catalogue" is spelt the French way. All further enquiries to Steve. Scrambling hurriedly back on-topic, a rod driven into the British part of the planet is called an "earth". I'd like to claim
/archives//html/Amps/2007-01/msg00121.html (7,923 bytes)

179. Re: [Amps]RE : ?Interesting Item........................... (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sat, 13 Jan 2007 15:47:21 +0000
You can see from the photographs that they are 4CX250BMs, an OEM version made for Marconi (hence the M). They were specially selected (and/or processed) for low secondary emission from the screen gri
/archives//html/Amps/2007-01/msg00125.html (8,184 bytes)

180. Re: [Amps] EIMAC (8877 TYPE) (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sun, 21 Jan 2007 09:13:19 +0000
That little word "theory" is a trap. It has two entirely different meanings. 1. Theory: a hypothesis or speculation. The next step is to test it, so practical experience does trump that kind of "theo
/archives//html/Amps/2007-01/msg00206.html (8,809 bytes)

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