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301. Re: [Amps] Big Solid State Power Amplifiers (score: 1): Author: Steve Thompson <g8gsq@qsl.net>; Date: Mon, 15 Dec 2003 14:54:19 +0000; Is it all that different? Whatever the technology, different devices offer benefits/disadvantages. The feedback systems are most easily applied round a transmitter rather than an amplifier, and I'm n; /archives//html/Amps/2003-12/msg00250.html (8,245 bytes)
302. Re: [Amps] Really Big Solid State Power Amplifiers (score: 1): Author: "Steve Thompson" <g8gsq@qsl.net>; Date: Tue, 16 Dec 2003 15:03:14 -0000; Very tricky, unless the operating conditions are chosen to keep the device within survival limits either all the time, or at least long enough for protection to kick in. More often than not, the ulti; /archives//html/Amps/2003-12/msg00263.html (9,914 bytes)
303. Re: [Amps] Really Big Solid State Power Amplifiers (score: 1): Author: "Steve Thompson" <g8gsq@qsl.net>; Date: Wed, 17 Dec 2003 20:19:35 -0000; A genuine question, not a sniping comment - has anyone looked at the frequency range where Tranzorbs work in this situation, and/or measured their impedance vs frequency? Steve ______________________; /archives//html/Amps/2003-12/msg00282.html (9,640 bytes)
304. Re: [Amps] High efficiency broadband designs (score: 1): Author: Steve Thompson <g8gsq@qsl.net>; Date: Thu, 18 Dec 2003 15:37:29 +0000; It's many years since I did some class-E work. To get the switching speed needed for the really high efficiency needed a small device, which was ok as the efficiency was high and dissipation low. Tha; /archives//html/Amps/2003-12/msg00297.html (8,557 bytes)
305. Re: [Amps] 3.5 kV 2A REGULATED Power Supply: Schematic ? (score: 1): Author: "Steve Thompson" <g8gsq@qsl.net>; Date: Mon, 29 Dec 2003 08:32:38 -0000; A capacitor might not be ideal, but a suitable voltage battery could be used, and probably last most of its shelf life. Steve _______________________________________________ Amps mailing list Amps@co; /archives//html/Amps/2003-12/msg00447.html (9,351 bytes)
306. Re: [Amps] 160/80m amp tube recommendations (score: 1): Author: "Steve Thompson" <g8gsq@qsl.net>; Date: Thu, 1 Jan 2004 08:40:54 -0000; The one I got for 70cms says 1500W output - I think that's the 'standard' now. I have a pair of 4cx1500As, one base and one heater transformer if that's of interest? Steve ___________________________; /archives//html/Amps/2004-01/msg00000.html (6,412 bytes)
307. [Amps] OT - anyone do me a favour? (score: 1): Author: "Steve Thompson" <g8gsq@qsl.net>; Date: Mon, 19 Jan 2004 16:02:02 -0000; I wonder if anyone in the US might help me out? I want to buy a couple of items for my workshop - I can get them readily in the UK but the price is over $150 equivalent. Looking online, the same item; /archives//html/Amps/2004-01/msg00188.html (7,181 bytes)
308. Re: [Amps] transformer secondary winding resistance here we go again (score: 1): Author: Steve Thompson <g8gsq@qsl.net>; Date: Wed, 21 Jan 2004 08:51:17 +0000; And don't forget it's the rms value of current to use here. With a capacitor input supply, rms current can be several times the dc current so (Irms squared) can easily be 5x (Idc squared). Steve ____; /archives//html/Amps/2004-01/msg00212.html (8,018 bytes)
309. Re: [Amps] Alpha 87A troubles with fault 17 (score: 1): Author: "Steve Thompson" <g8gsq@qsl.net>; Date: Sat, 24 Jan 2004 08:18:02 -0000; I'm fairly sure that the FT990 I used to have did overshoot. As I recall, it did it big time if you turned the output power down. Steve _______________________________________________ Amps mailing li; /archives//html/Amps/2004-01/msg00246.html (8,156 bytes)
310. Re: [Amps] Tough valves? (score: 1): Author: Steve Thompson <g8gsq@qsl.net>; Date: Mon, 26 Jan 2004 10:11:54 +0000; If we're considering the mechanical viewpoint, I'd find it difficult to imagine anything much more rugged than a GS35B internally. Steve _______________________________________________ Amps mailing l; /archives//html/Amps/2004-01/msg00285.html (7,708 bytes)
311. Re: [Amps] Horizontal or verticle? (score: 1): Author: Steve Thompson <g8gsq@qsl.net>; Date: Mon, 26 Jan 2004 10:30:25 +0000; Sounds like nonsense to me. If you subject one to sufficient mechanical or electrical violence to produce and loose matter inside, you should be replacing it anyway. There are many valves that are sp; /archives//html/Amps/2004-01/msg00286.html (8,017 bytes)
312. Re: [Amps] Alpha 87A troubles with fault 17 (score: 1): Author: Steve Thompson <g8gsq@qsl.net>; Date: Mon, 26 Jan 2004 15:02:15 +0000; I'm sure it's like the FT1000(?) someone mentioned earlier - the power control lowers the reference input to the alc system without reducing the base level of the tx strip gain. That's a boo-boo.....; /archives//html/Amps/2004-01/msg00295.html (8,627 bytes)
313. Re: [Amps] Data sheet (score: 1): Author: Steve Thompson <g8gsq@qsl.net>; Date: Fri, 30 Jan 2004 09:51:39 +0000; As far as I can see, the Svetlana datasheet is a word for word copy of the Eimac one, including the constant current curves. Svetlana don't include AM/high level mod operation though. If anyone is in; /archives//html/Amps/2004-01/msg00354.html (7,499 bytes)
314. Re: [Amps] shipping amps (score: 1): Author: "Steve Thompson" <g8gsq@qsl.net>; Date: Sat, 31 Jan 2004 18:43:33 -0000; A place I use returns test gear from cal this way - cardboard box, foam in the bottom, then a sheet of plastic and bed the equipment into it. More plastic over the equipment and more foam so it's up; /archives//html/Amps/2004-01/msg00376.html (7,607 bytes)

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