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1. [Amps] power supply transformer (score: 1): Author: kg7hf@comcast.net; Date: Thu, 25 Jan 2007 12:58:08 +0000; I am not sure I'm sending this correctly, but here goes. I want to build a 120 volt DC source that can supply ~35 amps. I would like to have the primary either 240 (typical) or 120 v AC. It doesn't h; /archives//html/Amps/2007-01/msg00258.html (6,705 bytes)
2. Re: [Amps] power supply transformer (score: 1): Author: kg7hf@comcast.net; Date: Thu, 25 Jan 2007 18:37:49 +0000; Thanks to everyone for the information, especially the information on "direct rectification" of the ac mains. I hadn't thought about the DC current being an issue on the neutral side, is that really; /archives//html/Amps/2007-01/msg00260.html (8,317 bytes)
3. [Amps] TR switching (score: 1): Author: kg7hf@comcast.net; Date: Mon, 29 Jan 2007 02:48:38 +0000; More of a curiousity question right now but, I notice in my trusty 3-500z amp, there is naturally a TR relay. It's fairly hefty. I see also that there is some band pass filtering, and that these are; /archives//html/Amps/2007-01/msg00309.html (6,594 bytes)
4. Re: [Amps] power supply transformer (score: 1): Author: kg7hf@comcast.net; Date: Tue, 30 Jan 2007 19:17:24 +0000; Back to transformers! Would something like this work as an isolation transformer? It doesn't exactly meet my requirements of being 120v/240v primary (switchable), but maybe 277v is close enough to 22; /archives//html/Amps/2007-01/msg00332.html (8,158 bytes)
5. Re: [Amps] power supply transformer (score: 1): Author: kg7hf@comcast.net; Date: Tue, 30 Jan 2007 20:15:39 +0000; Hi Tom, It probably did seem a bit strange. Basically, I need to make a power supply capable of around 100v @ 30A. It does not need to be regulated, but should be well filtered as it will be in a sol; /archives//html/Amps/2007-01/msg00334.html (8,414 bytes)
6. Re: [Amps] power supply transformer (score: 1): Author: kg7hf@comcast.net; Date: Wed, 31 Jan 2007 21:36:36 +0000; Would that be 28v AC @100 amps? Then use a voltage tripler to get to 119? _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/lis; /archives//html/Amps/2007-01/msg00348.html (10,782 bytes)
7. Re: [Amps] power supply transformer (score: 1): Author: kg7hf@comcast.net; Date: Fri, 02 Feb 2007 21:53:15 +0000; Hi Manfred, My original thoughts were not to use a transformer, I had never seen a 'real' design, besides a switched mode power supply that did not have an isolation transformer on the mains before a; /archives//html/Amps/2007-02/msg00024.html (8,842 bytes)
8. Re: [Amps] 1 tube or two ?? (score: 1): Author: kg7hf@comcast.net; Date: Sun, 11 Feb 2007 23:09:24 +0000; I don't know much about the 4-1000, but the Navy uses (or used to) a pair of 4cx1500b's the output is a little over 1500 watts usually, and I know more can be had... But most of the communications ba; /archives//html/Amps/2007-02/msg00198.html (8,222 bytes)
9. [Amps] 4CX600A (score: 1): Author: kg7hf@comcast.net; Date: Thu, 15 Feb 2007 12:38:50 +0000; Anyone have a data sheet for the 4CX600A? I've found 'B', 'F', 'J', and 'JA', but not an 'A'. I would like to know if I could use a pair of these in a 144 Mhz amp. Also the real data sheet would be h; /archives//html/Amps/2007-02/msg00247.html (6,230 bytes)
10. Re: [Amps] 4CX600A (score: 1): Author: kg7hf@comcast.net; Date: Fri, 16 Feb 2007 01:33:18 +0000; Interesting! The pair looks just like the 'B' and 'F' versions (gold, round top), they say Eimac, and made in the USA, but that is really all that is on them. That sure supports why I can't find a da; /archives//html/Amps/2007-02/msg00257.html (8,137 bytes)
11. Re: [Amps] Amps Digest, Vol 51, Issue 10 (score: 1): Author: kg7hf@comcast.net; Date: Mon, 05 Mar 2007 19:15:21 +0000; I'm doing a small presentation (tonight) for our local radio club regarding DSP and it's uses. I ran accross something fairly interesting, but is somewhat last minute, and want to mention it in passi; /archives//html/Amps/2007-03/msg00072.html (7,381 bytes)
12. Re: [Amps] This reflector. (score: 1): Author: kg7hf@comcast.net; Date: Tue, 20 Mar 2007 22:58:02 +0000; I've only been subscribed for a few months. I have found that people have answered my questions with truthfulness and have pointed me to good reference material. I have never felt that anyone has eve; /archives//html/Amps/2007-03/msg00267.html (7,806 bytes)
13. Re: [Amps] attaching a heat spreader to a heat sink (score: 1): Author: kg7hf@comcast.net; Date: Wed, 23 May 2007 23:24:03 +0000; If it is an aluminum head sink, why not just plane it? As long as your using carbide or heat treated cutters, a regular benchtop planer should work fine (make many fine passes). I've never run a heat; /archives//html/Amps/2007-05/msg00183.html (8,440 bytes)
14. Re: [Amps] attaching a heat spreader to a heat sink (score: 1): Author: kg7hf@comcast.net; Date: Thu, 24 May 2007 11:06:43 +0000; I agree with everything here, I just think that it's likely overkill to need to do the final sanding step. If you have a good planer, and are careful in the setup, the runout should be very minimal,; /archives//html/Amps/2007-05/msg00191.html (12,067 bytes)
15. [Amps] MRF141G (score: 1): Author: kg7hf@comcast.net; Date: Mon, 11 Jun 2007 01:08:50 +0000; Hello everyone, Any idea how I can test an MRF141G? Preferably out of circuit as I don't know if other components are damaged. thanks. _______________________________________________ Amps mailing lis; /archives//html/Amps/2007-06/msg00062.html (6,220 bytes)
16. Re: [Amps] LK-500 ZA heat (score: 1): Author: kg7hf@comcast.net; Date: Tue, 14 Aug 2007 17:03:37 +0000; So if I just take the top of my LK500 amp off and place a 18" box fan (from walmart) over it, on high setting, it should run cooler correct? My real question: Is there a point where you have too much; /archives//html/Amps/2007-08/msg00078.html (7,244 bytes)
17. [Amps] T-R switching (score: 1): Author: kg7hf@comcast.net; Date: Thu, 30 Aug 2007 02:34:03 +0000; Greetings, I preface this with I am not a EE (I write code for a living) ;) With the help of a few books, I have attempted to design and build a circuit, but I am having trouble making it work consis; /archives//html/Amps/2007-08/msg00253.html (7,890 bytes)
18. Re: [Amps] Wanted: 3-500z amp plans (score: 1): Author: kg7hf@comcast.net; Date: Tue, 18 Sep 2007 16:25:12 +0000; How about plans but with a twist, 160 - 6 meters so it matches my rig? Any ideas or suggestions? Hello all... I am looking for some ideas for putting an amp together that utilizes 2 3-500z's and work; /archives//html/Amps/2007-09/msg00195.html (8,276 bytes)
19. Re: [Amps] 6 meters (score: 1): Author: kg7hf@comcast.net; Date: Wed, 26 Sep 2007 00:43:03 +0000; I'm relatively new here, and I second that! Can someone come over to my house and help me with my homebrew amp? 73s, Paul (kg7hf) _______________________________________________ Amps mailing list Amp; /archives//html/Amps/2007-09/msg00308.html (7,082 bytes)
20. Re: [Amps] How about a Solid State MARS amp (score: 1): Author: kg7hf@comcast.net; Date: Wed, 10 Oct 2007 17:18:55 +0000; Why not just use an ALS500 from Ameritron? It should be fairly easy to retune to MARS. I would even suspect that it could be used without rework at all. My guess is there is no input band filtering,; /archives//html/Amps/2007-10/msg00102.html (12,565 bytes)

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