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341. Re: [Amps] New SB-200 owner (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 27 Sep 2007 16:15:22 +0100; OK. I'll ask Ian to correct me next time we share a beer. The way I see it, if the shunt regulator is doing its job right, then the dropper is of little importance. I'll also leave it at that. Steve; /archives//html/Amps/2007-09/msg00410.html (9,957 bytes)
342. Re: [Amps] New SB-200 owner (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 27 Sep 2007 16:45:18 +0100; Perhaps I should have been more careful with words. By 'adequate' I meant good enough that it wasn't the predominant factor in IMD performance - in effect, giving the same results as John and Ian's r; /archives//html/Amps/2007-09/msg00411.html (8,987 bytes)
343. Re: [Amps] Amps During Working Hours (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 27 Sep 2007 21:59:47 +0100; Colin, I wish I had your way with words. I seem to spend a lot of time helping out a local charity. In what's spare I go to work and what you say sums up my time there perfectly. All I'd add is that; /archives//html/Amps/2007-09/msg00428.html (8,165 bytes)
344. Re: [Amps] 4CX250 IMD (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 28 Sep 2007 07:30:51 +0100; At what power and efficiency? Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2007-09/msg00451.html (8,165 bytes)
345. Re: [Amps] 4CX250 IMD (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 28 Sep 2007 10:45:02 +0100; Looking at GW4FRX's measurements, I wonder if the IMD you measured owed more to the screen supply than to the tubes themselves? The old Was that the new version or the older one in the diecast box? S; /archives//html/Amps/2007-09/msg00455.html (8,244 bytes)
346. Re: [Amps] 4CX250 IMD (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 28 Sep 2007 17:54:55 +0100; Single tube or pair? Thanks, Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2007-09/msg00467.html (9,113 bytes)
347. Re: [Amps] 4CX250 IMD (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sat, 29 Sep 2007 08:45:16 +0100; Pushing a 4CX250 to 470W pep output is absurd and it's no surprise that the IMD is awful. It's totally unrepresentative of proper use of the tube in linear operation. Collating all the info. we've b; /archives//html/Amps/2007-09/msg00473.html (9,791 bytes)
348. Re: [Amps] 4CX250 IMD (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sat, 29 Sep 2007 17:28:46 +0100; OK - it was a figure of speech. Please substitute 'at 470W' for 'with massive overdrive'. and at much higher output power. The IMD goes bad because the tube is being pushed to deliver too much power,; /archives//html/Amps/2007-09/msg00488.html (13,009 bytes)
349. Re: [Amps] 4CX250 IMD (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sun, 30 Sep 2007 17:51:53 +0100; I hadn't ignored the ratings - it's just that a published performance of -23dB IMD at 470W pep doesn't contribute much when you're considering designing for -30 or better. It tells you that you're go; /archives//html/Amps/2007-09/msg00515.html (12,576 bytes)
350. Re: [Amps] 4CX250 IMD (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sun, 30 Sep 2007 21:37:10 +0100; I was surprised to learn that the silicon point contact diode was patented in 1906. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting; /archives//html/Amps/2007-09/msg00519.html (9,850 bytes)
351. Re: [Amps] 4CX250 IMD (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 01 Oct 2007 07:39:58 +0100; Do us a favour - scan it and send a copy to G8WRB. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2007-10/msg00002.html (6,520 bytes)
352. Re: [Amps] 4CX250 IMD (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 01 Oct 2007 08:08:09 +0100; My guess: Comparison against fixed attenuators using either spectrum analyser or receiver should give fairly good accuracy of relative values. Calibrating a diode detector against cw should give rea; /archives//html/Amps/2007-10/msg00003.html (7,140 bytes)
353. Re: [Amps] 4CX250 IMD (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 01 Oct 2007 15:02:02 +0100; I know the sort of stuff you mean - and the variations and drift. Better accuracy takes time more than anything because you're probably not using a swept analyser, and having to make numerous compari; /archives//html/Amps/2007-10/msg00006.html (9,503 bytes)
354. Re: [Amps] 8877 Grid Trip timing (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 02 Oct 2007 22:41:34 +0100; In my college work experience days I worked in a team on a L band radar system - the output device was a hybrid of TWT with klyston built in at the bottom. As best I recall it sat with 40kV across i; /archives//html/Amps/2007-10/msg00026.html (9,022 bytes)
355. Re: [Amps] Anyone build a GU5B? (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 04 Oct 2007 21:21:49 +0100; Looking at the picture on DF6NA's page, it looks quite like the STC 3J/160E I have - the anode looks identical. My tube came from a vibrator rig - as in shaking things to bits :-) . The most common u; /archives//html/Amps/2007-10/msg00043.html (7,205 bytes)
356. Re: [Amps] EIMAC APP NOTES, COMPLETE (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sun, 07 Oct 2007 09:43:06 +0100; Yes Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2007-10/msg00071.html (7,855 bytes)
357. Re: [Amps] EIMAC APP NOTES, COMPLETE (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sun, 07 Oct 2007 09:44:14 +0100; PS strictly speaking, Layla was Derek and the Dominoes. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2007-10/msg00072.html (7,522 bytes)
358. Re: [Amps] How about a Solid State MARS amp??? fwiw (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 10 Oct 2007 07:43:54 +0100; Here's one possible starting point: http://www.communication-concepts.com/eb104.htm It would probably come in at $1/W or thereabouts by the time you add a heatsink, box and filter. A PSU from the su; /archives//html/Amps/2007-10/msg00091.html (8,503 bytes)
359. [Amps] Help with balun core please (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 11 Oct 2007 11:33:10 +0100; I wonder if anyone can identify a manufacturer or likely part number for me? I have a two hole balun core, .5" x .5" x .25" It has green paint on one of the flat faces. I'm fairly certain it's of US; /archives//html/Amps/2007-10/msg00124.html (6,708 bytes)
360. Re: [Amps] Some thoughts on a transistorized legal limitamplifier... (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sat, 13 Oct 2007 19:46:41 +0100; I think you'd need a feedback system - polar or cartesian loop, for example. The AM/PM in the output stage will be severe, and probably beyond simple pre-correction in open loop. You can buy the who; /archives//html/Amps/2007-10/msg00171.html (7,810 bytes)

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