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Total 10 documents matching your query.

1. Re: [Amps] Plate choke resonanse and safe operation (score: 1): Author: "OZ1AXG Flam" <oz1axg.nospam@dxmail.dk>; Date: Thu, 25 Dec 2008 13:17:33 +0100; Hi I re-measured the RFC resonanse of my ameritron amp (I replaced the RFC after a previous burnout on 30 meter). For the new measurement i shortcircuited the choke, while normally mounted in the amp; /archives//html/Amps/2008-12/msg00323.html (11,752 bytes)
2. Re: [Amps] Plate choke resonanse and safe operation (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Sun, 07 Dec 2008 13:47:35 -0800; I mean that in order to check for series resonance in the choke -- that's the kind that's dangerous -- you need to short-circuit the choke with a length of wire before measuring with the dip meter. O; /archives//html/Amps/2008-12/msg00154.html (9,857 bytes)
3. Re: [Amps] Plate choke resonanse and safe operation (score: 1): Author: "OZ1AXG Flam" <oz1axg.nospam@dxmail.dk>; Date: Sun, 7 Dec 2008 22:27:45 +0100; Hi Vic I did measurements when the RFC was installed in the amplifier. What do you mean by "shorted" ? Also I operated the amplifyer today. on 28.400 MHz the Plate current and output is normal compar; /archives//html/Amps/2008-12/msg00151.html (10,282 bytes)
4. Re: [Amps] Plate choke resonanse and safe operation (score: 1): Author: "Dan Hearn" <n5ar@air-pipe.com>; Date: Sun, 7 Dec 2008 11:51:24 -0800; 10 years or more ago I remember seeing an article about modifying a pre WARC Alpha linear to work on those bands. The problem was the RFC resonance. He moved it by installing a loosely coupled single; /archives//html/Amps/2008-12/msg00148.html (8,784 bytes)
5. Re: [Amps] Plate choke resonanse and safe operation (score: 1): Author: "David Robbins K1TTT" <k1ttt@arrl.net>; Date: Sun, 07 Dec 2008 18:40:09 +0000; A handy tool for checking amp component temperature is an infra-red thermometer. These are available from a variety of sources. I got one from sears that goes up to 1400f and also includes a thermoco; /archives//html/Amps/2008-12/msg00146.html (11,854 bytes)
6. Re: [Amps] Plate choke resonanse and safe operation (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 7 Dec 2008 13:30:01 -0500; I agree that a GDO is only an approximation. Try running the amp at 500W to start at 28.0 mHz and then feel the choke for excessive heat. Go up in 250W steps and check each time. Of course be sure al; /archives//html/Amps/2008-12/msg00145.html (10,554 bytes)
7. Re: [Amps] Plate choke resonanse and safe operation (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Sun, 07 Dec 2008 08:21:28 -0800; You didn't mention it, but I assume that you know that the choke must be *shorted* when you dip it. I am afraid that the symptoms are mostly that the choke burns out! -- 73, Vic, K2VCO Fresno CA http; /archives//html/Amps/2008-12/msg00142.html (9,566 bytes)
8. Re: [Amps] Plate choke resonanse and safe operation (score: 1): Author: "OZ1AXG Flam" <oz1axg.nospam@dxmail.dk>; Date: Sun, 7 Dec 2008 12:06:15 +0100; the RFC is Installed I will try to measure the resonans again. For 27 MHZ i did the measurement 3 times. A grid dip meter is not the most accurate instrument, so i will try it again. but how close is; /archives//html/Amps/2008-12/msg00135.html (9,440 bytes)
9. Re: [Amps] Plate choke resonanse and safe operation (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 6 Dec 2008 19:09:53 -0500; Is that installed or on the bench? That first one is too close for comfort for 10M CW. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.con; /archives//html/Amps/2008-12/msg00129.html (9,682 bytes)
10. [Amps] Plate choke resonanse and safe operation (score: 1): Author: "OZ1AXG Flam" <oz1axg.nospam@dxmail.dk>; Date: Sat, 6 Dec 2008 22:19:52 +0100; Hi Just replaced the plate choke in my ameritron amplifier. I checked the choke resonanse, with a dip meter, and found resonans at: fo = 27.711 MHz fo = 15.265 MHz fo = 10.839 MHz Qustion is: how clo; /archives//html/Amps/2008-12/msg00127.html (8,574 bytes)

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