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References: [ +from:G3SEK@ifwtech.co.uk: 291 ]

Total 291 documents matching your query.

221. Re: [Amps] SB-220 parasitic suppressors (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Thu, 4 Nov 2004 08:23:55 +0000
K7RDX wrote: My hf GS-35b AMP has a supressor only in the cathode and has been super stable for the last four years..... GS-35B amps on 432MHz, 144Mhz and 50MHz are unconditionally stable with NO par
/archives//html/Amps/2004-11/msg00064.html (9,428 bytes)

222. Re: [Amps] SB-220 parasitic suppressors (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Thu, 4 Nov 2004 19:47:46 +0000
R. Measures wrote: On Nov 4, 2004, at 12:23 AM, Ian White, G3SEK wrote: K7RDX wrote: My hf GS-35b AMP has a supressor only in the cathode and has been super stable for the last four years..... GS-35B
/archives//html/Amps/2004-11/msg00080.html (14,548 bytes)

223. Re: [Amps] SB-220 parasitic suppressors (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Fri, 5 Nov 2004 23:20:19 +0000
Tony King wrote: What is the resonant frequency of the grid in this fixture? Does the grid-grounding fixture have zero inductance? Nothing has literally zero inductance, but the GS35B is a planar tri
/archives//html/Amps/2004-11/msg00104.html (11,223 bytes)

224. Re: [Amps] Ten-Tec Centurion (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Thu, 11 Nov 2004 12:53:34 +0000
R. Measures wrote: Assuming the spike is at the leading edge of the transmitted signal, then an rf sensing circuit could delay the turn on of the rf amplifier until after the passing of the spike. Co
/archives//html/Amps/2004-11/msg00143.html (11,261 bytes)

225. Re: [Amps] Ten-Tec Centurion (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Thu, 11 Nov 2004 15:03:20 +0000
R. Measures wrote: when the input relay is closed but the output contacts are not. The PA then has full drive but no load, which could lead to very high voltages across the tank components. Ian -- Wo
/archives//html/Amps/2004-11/msg00148.html (10,136 bytes)

226. Re: [Amps] parasitic LC>load? (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Fri, 12 Nov 2004 07:45:08 +0000
R. Measures wrote: Been thinking. If some of these rigs 'want to' go parasitic, would it be beneficial to help them via a broadband VHF resonant circuit that is coupled to the HF RF tank with that VH
/archives//html/Amps/2004-11/msg00164.html (8,637 bytes)

227. Re: [Amps] Shaded-pole Tube Blower (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Sun, 21 Nov 2004 23:55:29 +0000
Joe Isabella wrote: Seems reasonable to have some kind of interlock for this -- a couple dollars worth of parts could easily save several hundred in new tubes. A friend of mine switched to a pair of
/archives//html/Amps/2004-11/msg00361.html (8,198 bytes)

228. Re: [Amps] P.C. boards (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Fri, 10 Dec 2004 20:48:48 +0000
Dennis Watkins wrote: There's a fellow with a salty old call that makes P.C. boards for the home brew amp builder. Can some one refresh whats left of my memory.. Retafier boards, input filtering, con
/archives//html/Amps/2004-12/msg00166.html (7,541 bytes)

229. [Amps] G3SEK Tetrode Boards and Triode Board manuals on the web (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Thu, 6 Jan 2005 23:52:16 +0000
We have made some changes - anyone interested, please check the website for details (see below). To help keep costs down, we will no longer be shipping instruction manuals with the boards or kits. Th
/archives//html/Amps/2005-01/msg00089.html (7,811 bytes)

230. Re: [Amps] one more time - Ameritron fuse question (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Sat, 8 Jan 2005 07:23:56 +0000
Dan wrote: Well you guys are batting 100% so far i now have one more Ameritron 811H question. I have replaced the grid resitor and replaced all four tubes (one was shorted causing the resitor to blow
/archives//html/Amps/2005-01/msg00119.html (9,467 bytes)

231. Re: [Amps] Re: AMPS Link coupling (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Sun, 9 Jan 2005 23:03:43 +0000
This is not correct. A parallel tuned circuit with a coupling link, loaded by a high impedance antenna can have its LC ratio determined such as to control the value of Q. It is possible that self cap
/archives//html/Amps/2005-01/msg00160.html (8,189 bytes)

232. [Amps] Re: L networks (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Tue, 11 Jan 2005 14:13:57 +0000
RZP wrote: In a message dated 09/01/2005 23:05:35 GMT Standard Time, G3SEK@ifwtech.co.uk writes: The minimum possible *loaded* Q that is required to transform between two resistances R2>R1, using any
/archives//html/Amps/2005-01/msg00203.html (8,786 bytes)

233. Re: [Amps] Tetrodes in GG Configuration (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Thu, 20 Jan 2005 07:03:21 +0000
k7fm wrote: There are some very good reasons to run a tetrode in grounded grid. Using the 4Cx1000A as an example, running it grid driven will result in unacceptable distortion products. To get accept
/archives//html/Amps/2005-01/msg00391.html (9,148 bytes)

234. Re: [Amps] Want to build first amp (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Thu, 20 Jan 2005 09:17:40 +0000
Jan Erik Holm wrote: GS35b costs MUCH less then 8877&acute;s or 3CX1200 tubes. For a 160-6m amp I would try a GS35b any day. Me too. Don't ever get sucked into using a particular tube or transformer,
/archives//html/Amps/2005-01/msg00395.html (8,185 bytes)

235. Re: [Amps] Tetrodes in GG Configuration (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Fri, 21 Jan 2005 07:23:53 +0000
David Pruett wrote: I'd like to point out another tetrode configuration which has some useful characteristics, and that is cathode driven, [...] but not in a zero bias, strapped as a triode configura
/archives//html/Amps/2005-01/msg00411.html (9,965 bytes)

236. Re: [Amps] What is it called? (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Sun, 23 Jan 2005 08:57:04 +0000
David Kirkby wrote: Harold B. Mandel wrote: Sirs, There is a material that is supplied in sheets of varying thicknesses, colored red, that makes excellent insulating boards. Does anyone know its trad
/archives//html/Amps/2005-01/msg00477.html (9,562 bytes)

237. Re: [Amps] PCB Trace width for 1500 watts RF? (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Sat, 29 Jan 2005 08:41:07 +0000
Dan Levin wrote: Anyone care to opine on the minimum pcb trace width appropriate (i.e. safe) to carry 1500 watts between 1.8 and 30 Mhz into an impedance mismatch of less than 2.5:1? Assume 2 oz copp
/archives//html/Amps/2005-01/msg00559.html (9,360 bytes)

238. Re: [Amps] please help with weird problem (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Sat, 29 Jan 2005 09:06:58 +0000
We Never Close - your morning shift has started in Europe! Steve Thompson wrote: k8bb@comcast.net wrote: Oh amplifier gurus ... this is rather long ... I have searched the archives, but I don't know
/archives//html/Amps/2005-01/msg00563.html (10,426 bytes)

239. Re: [Amps] MOV - Varistor Reccomendations (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Sun, 30 Jan 2005 09:26:59 +0000
David Pruett wrote: At 10:44 AM 1/29/2005, aborg wrote: Can anyone suggest what MOV to use for my 1N5408 rectifier board. I an using 32 diodes , 8 per leg. My transformer is a 4800 Vac pole pig. I wa
/archives//html/Amps/2005-01/msg00609.html (10,653 bytes)

240. Re: [Amps] Choices for valve linear project 1st timer! (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Mon, 31 Jan 2005 22:42:46 +0000
Simon Steed wrote: 1/One published in the UK mag Ham Radio Today & was designed by G4JST. It uses three 4CX250B's with a HT of 1.3kv to produce 400W which is apparently very linear output. I know the
/archives//html/Amps/2005-01/msg00656.html (9,192 bytes)

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