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1. 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)
2. 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)
3. 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)
4. 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)
5. 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)
6. 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)
7. 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)
8. [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)
9. 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)
10. 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)
11. 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)
12. 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)
13. 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)
14. 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)
15. Re: [Amps] Input Matching for 8877 on 2m (score: 1): Author: Steve Thompson <g8gsq@qsl.net>; Date: Fri, 12 Dec 2003 10:28:16 +0000; Wind an airspaced coil of similar size, and manually squeeze/stretch it (and the second L) until you get a match that tunes nicely with the variable C. Rewind for more/less L as you find necessary. S; /archives//html/Amps/2003-12/msg00199.html (7,667 bytes)
16. Re: [Amps] MLA-2500 question (score: 1): Author: Steve Thompson <g8gsq@qsl.net>; Date: Fri, 12 Dec 2003 10:29:31 +0000; From memory, it's used to peak the directivity of the coupler. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo; /archives//html/Amps/2003-12/msg00198.html (7,210 bytes)
17. Re: [Amps] Homebrew solid state amps? (score: 1): Author: Steve Thompson <g8gsq@qsl.net>; Date: Fri, 12 Dec 2003 10:19:51 +0000; Helge Granberg did some designs using 4 x MRF150s for 600W out, and the MRF157 datasheet includes a design for a 1kW amp. Another layer or two of combining should get you there. If your amp doesn't n; /archives//html/Amps/2003-12/msg00197.html (7,444 bytes)
18. Re: [Amps] AL-1200 Questions (score: 1): Author: Steve Thompson <g8gsq@qsl.net>; Date: Thu, 27 Nov 2003 11:17:33 +0000; I think they don't need to be. If something delivers enough energy to spray melted gold from the grid everywhere, I reckon that it's highly likely that some cathode material gets sprayed around as we; /archives//html/Amps/2003-11/msg00379.html (9,348 bytes)
19. Re: [Amps] AL-1200 Questions (score: 1): Author: Steve Thompson <g8gsq@qsl.net>; Date: Wed, 26 Nov 2003 17:42:58 +0000; I'd be surprised if it was there in large enough lumps to see. Do you see the effect once the balls are out of the tube? Steve _______________________________________________ Amps mailing list Amps@c; /archives//html/Amps/2003-11/msg00373.html (9,113 bytes)
20. Re: [Amps] AL-1200 Questions (score: 1): Author: Steve Thompson <g8gsq@qsl.net>; Date: Tue, 25 Nov 2003 10:35:50 +0000; My knowledge of atomic physics is limited, but it strikes me as much more likely that some of the gold balls have cathode material on them. Steve _______________________________________________ Amps; /archives//html/Amps/2003-11/msg00360.html (8,356 bytes)

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