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1. [Amps] Delicate Transistors....? (score: 1): Author: gw4dgu at blaenffos.org (gw4dgu@blaenffos.org); Date: Fri Jul 18 09:08:28 2003; Hmmmmm... That's not really the case. There seems to be an idea amongst many amateur amplifier builders that solid-state devices are somehow unreliable and delicate. That's really the opposite of the; /archives//html/Amps/2003-07/msg00095.html (7,794 bytes)
2. [Amps] Re: Amps Digest, Vol 8, Issue 18 (score: 1): Author: gw4dgu at blaenffos.org (gw4dgu@blaenffos.org); Date: Mon Aug 18 08:19:31 2003; on I've also dealt with Anthony Welsh. He's a real guy, and holds a GW call. have a nice little business working with guys in the Ukraine to recycle Russian military surplus. I've just brought some; /archives//html/Amps/2002-09/msg00395.html (7,174 bytes)
3. [Amps] Using 4CX350s on 144 (score: 1): Author: gw4dgu@blaenffos.org; Date: Thu, 28 Aug 2003 17:13:58 +0100; If you must go down the tube route, and the possession of a nice new pair of tubes might even make me consider it, a pair of '350s will work well in a W1SL-type amplifier on 144. Get hold of a copy o; /archives//html/Amps/2003-08/msg00066.html (39,898 bytes)
4. [Amps] Using surface-mount devices (score: 1): Author: "Chris Bartram" <gw4dgu@blaenffos.org>; Date: Fri, 12 Sep 2003 21:23:45 +0100; Earning my bread-and-butter as an engineer designing RF electronics, I've spent far too much time working on SM PCBs..... If you have the right tools, it's not so difficult to work with SM discrete c; /archives//html/Amps/2003-09/msg00107.html (8,139 bytes)
5. [Amps] Teflon Chimneys (score: 1): Author: "Chris Bartram" <gw4dgu@blaenffos.org>; Date: Tue, 16 Sep 2003 21:35:00 +0100; Back in the mists of time I built a K2RIW PA for 432MHz. That used a pair of 4CX250BMs in parallel with a reverse airflow system, and would seriously endstop a 1kW Bird slug in class-C without overdi; /archives//html/Amps/2003-09/msg00148.html (8,007 bytes)
6. [Amps] MetCal Soldering Tools (score: 1): Author: "Chris Bartram" <gw4dgu@blaenffos.org>; Date: Wed, 17 Sep 2003 18:12:53 +0100; what's especially good about soldering with a Metcal?< Try one and see Ian! I rarely see Wellers in labs nowadays. I think they use an eddy current heating technique to deliver heat a lot closer to; /archives//html/Amps/2003-09/msg00162.html (6,994 bytes)
7. [Amps] Water Cooling (score: 1): Author: gw4dgu@blaenffos.org; Date: Mon, 3 Nov 2003 20:10:47 -0000; approach that can serve as a liquor still when the band is dead. Dan, those are the words of a genius! What better way of disguising a still from those pesky Excise men... This could encourage me to; /archives//html/Amps/2003-11/msg00036.html (7,060 bytes)
8. [Amps] Big Solid State Amplifiers (score: 1): Author: gw4dgu@blaenffos.org; Date: Fri, 12 Dec 2003 19:28:11 -0000; Since returning to active amateur radio after a break of nearly two decades, I've been a bit saddened to see that many hams seem to be shying away from solid state amplifiers, and investing them with; /archives//html/Amps/2003-12/msg00207.html (9,490 bytes)
9. [Amps] Big Solid State Power Amplifiers (score: 1): Author: gw4dgu@blaenffos.org; Date: Sun, 14 Dec 2003 19:38:47 -0000; I don't disagree at all with this. The point I was trying - however ineptly - to make is that solid state technology requires a different approach to traditional tube design. work of to Again, I don; /archives//html/Amps/2003-12/msg00242.html (7,798 bytes)
10. Re: [Amps] Big Solid State Power Amplifiers (score: 1): Author: gw4dgu@blaenffos.org; Date: Mon, 15 Dec 2003 14:53:26 -0000; I don't know what designs you are familiar with, but combiner losses don't usually impact significantly on efficiency. That's why they are used in high-efficiency AM BC transmitters... The use of mod; /archives//html/Amps/2003-12/msg00251.html (8,637 bytes)
11. Re: [Amps] Big Solid State Power Amplifiers (score: 1): Author: gw4dgu@blaenffos.org; Date: Mon, 15 Dec 2003 23:11:14 -0000; don't In terms of fractional bandwidth BC transmitters covering 500 - 1650kHz aren't narrow-band! Of course BC transmitters are designed for AM, and aren't linear, but there are people using class-D; /archives//html/Amps/2003-12/msg00256.html (9,104 bytes)
12. [Amps] Re: Amps Digest, Vol 12, Issue 33 (score: 1): Author: gw4dgu@blaenffos.org; Date: Tue, 16 Dec 2003 20:24:14 -0000; If it ever comes up as a scrapper, let me know!! I have a delivery address in VE6.......... Modern RF Fets are pretty robust devices and have an MTBF a couple orders of magnitude better than thermio; /archives//html/Amps/2003-12/msg00268.html (9,407 bytes)
13. [Amps] Re: Amps Digest, Vol 12, Issue 35 (score: 1): Author: gw4dgu@blaenffos.org; Date: Wed, 17 Dec 2003 23:34:56 -0000; Neither have I. But that's not the point of the discussion I was trying to have. I was just trying to point-out that many hams are unaware of some of the developments in transmitter design which hav; /archives//html/Amps/2003-12/msg00291.html (7,969 bytes)
14. [Amps] Re: Amps Digest, Vol 12, Issue 38 (score: 1): Author: gw4dgu@blaenffos.org; Date: Sat, 20 Dec 2003 00:04:39 -0000; Weren't they a wedding present....?! MX es HNY 73 Chris GW4DGU _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2003-12/msg00317.html (6,853 bytes)
15. [Amps] Linearising Amplifiers (score: 1): Author: gw4dgu@blaenffos.org; Date: Sat, 20 Dec 2003 00:33:26 -0000; Hello All A few quick notes/comments as it's late: Simon Whittle's notes on the Cree site _are_ a good primer. Simon knows his stuff, and FWIW we've narrowly avoided being co-workers in the past. Pol; /archives//html/Amps/2003-12/msg00318.html (6,589 bytes)
16. [Amps] Re: Amps Digest, Vol 12, Issue 59 (score: 1): Author: gw4dgu@blaenffos.org; Date: Wed, 31 Dec 2003 01:19:00 -0000; operator........ Oh yes it can....! If you can show me a transceiver with an ALC loop which doesn't transiently produce output spikes significantly in excess of the steady-state level, then I'd be p; /archives//html/Amps/2003-12/msg00479.html (7,563 bytes)
17. Re: [Amps] Re: Amps Digest, Vol 12, Issue 33 (score: 1): Author: gw4dgu@blaenffos.org; Date: Wed, 31 Dec 2003 13:58:44 -0000; required. Can you be specific? They do. As I mentioned above, a solid state device has about two orders of magnitude greater MTBF than a tube This how folklore develops. There is no more need to att; /archives//html/Amps/2003-12/msg00488.html (12,676 bytes)

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