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1. [Amps] Westinghouse BC Ammeter QX-37 (score: 1): Author: HAROLD B MANDEL <ka1xo@juno.com>; Date: Sun, 8 Jan 2006 10:36:30 -0500; Gents, Phil at Fair Radio just sent up a couple of 4" square matching meters for my latest project. They are Westinghouse Type QX-37's, one being the 0 - 5KV voltmeter and the other being the 0 - 2 a; /archives//html/Amps/2006-01/msg00251.html (6,934 bytes)
2. Re: [Amps] Westinghouse BC Ammeter QX-37 (score: 1): Author: "RICHARD GEORGE" <k6kwq@msn.com>; Date: Sun, 8 Jan 2006 08:19:04 -0800; Put the amp meter in the negative lead of the power supply K6KWQ Dick "12 Volt radios are for wimps, real radios can kill you" Still can't make it go QRO with "More Power" -- Original Message -- From; /archives//html/Amps/2006-01/msg00252.html (8,979 bytes)
3. Re: [Amps] Westinghouse BC Ammeter QX-37 (score: 1): Author: jkearman@att.net (Jim Kearman); Date: Sun, 08 Jan 2006 16:31:41 +0000; You shouldn't be connecting it in the plate lead. Measure the cathode current, which is at low voltage. What's the resistance measured across the terminals? If it's a 2-A meter it should be pretty lo; /archives//html/Amps/2006-01/msg00253.html (7,833 bytes)
4. Re: [Amps] Westinghouse BC Ammeter QX-37 (score: 1): Author: HAROLD B MANDEL <ka1xo@juno.com>; Date: Sun, 8 Jan 2006 11:42:51 -0500; Thank you for your replies. Yes, the meter will go in the negative return line to the power supply, and will have back to back 200 peak amp diodes plus disk caps. The "peace-of-mind" request was spec; /archives//html/Amps/2006-01/msg00254.html (7,430 bytes)
5. Re: [Amps] Westinghouse BC Ammeter QX-37 (score: 1): Author: "Ian White, GM3SEK" <gm3sek@ifwtech.co.uk>; Date: Sun, 08 Jan 2006 18:55:02 +0000; Hal, the best way to protect your investment is to download another copy of your Triode Board manual :-) The ideal situation for diode protection is when the meter has a voltage drop of just 0.5V at; /archives//html/Amps/2006-01/msg00255.html (9,559 bytes)
6. Re: [Amps] Westinghouse BC Ammeter QX-37 (score: 1): Author: John <crazytvjohn@yahoo.com>; Date: Sun, 8 Jan 2006 10:55:58 -0800 (PST); Is this a quiz? john kb9tc Phil at Fair Radio just sent up a couple of 4" square matching meters for my latest project. They are Westinghouse Type QX-37's, one being the 0 - 5KV voltmeter and the oth; /archives//html/Amps/2006-01/msg00256.html (8,270 bytes)
7. Re: [Amps] Westinghouse BC Ammeter QX-37 (score: 1): Author: Bill Turner <dezrat1242@ispwest.com>; Date: Sun, 08 Jan 2006 16:46:54 -0800; ORIGINAL MESSAGE: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ This part of your question puzzles me. I see you are in the US, so you will be running max output of 1500 watts. Most amplifiers ar; /archives//html/Amps/2006-01/msg00257.html (8,420 bytes)
8. Re: [Amps] Westinghouse BC Ammeter QX-37 (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 09 Jan 2006 08:23:15 +0000; Most amplifiers can achieve 65% efficiency but will be noticably cleaner if they're correctly tuned/loaded for 50-55%. Steve _______________________________________________ Amps mailing list Amps@con; /archives//html/Amps/2006-01/msg00258.html (8,292 bytes)
9. Re: [Amps] Westinghouse BC Ammeter QX-37 (score: 1): Author: HAROLD B MANDEL <ka1xo@juno.com>; Date: Mon, 9 Jan 2006 08:22:50 -0500; Dear Bill, The figure 3817.5 Watts is simply the Anode Supply consumption at full bore of 2545 Volts times 1.5 amperes. This is from a "black box" model where the entire amplifier is just seen as a 1; /archives//html/Amps/2006-01/msg00259.html (9,475 bytes)
10. Re: [Amps] Westinghouse BC Ammeter QX-37 (score: 1): Author: Bill Turner <dezrat1242@ispwest.com>; Date: Mon, 09 Jan 2006 06:28:17 -0800; ORIGINAL MESSAGE: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ I'm sure your statement is correct in a technical sense, but is more "cleanliness" necessary? I prowl around the bands a lot and th; /archives//html/Amps/2006-01/msg00261.html (8,980 bytes)
11. Re: [Amps] Westinghouse BC Ammeter QX-37 (score: 1): Author: "k7fm" <k7fm@teleport.com>; Date: Mon, 9 Jan 2006 06:46:59 -0800; "In other words, if an amp already meets FCC specs for IMD, what does a five or ten dB improvement get you?" I thought the FCC specs were only that the amplifier be clean enough to stay in the ham ph; /archives//html/Amps/2006-01/msg00263.html (9,101 bytes)
12. Re: [Amps] Westinghouse BC Ammeter QX-37 (score: 1): Author: GM3SEK <gm3sek@ifwtech.co.uk>; Date: Mon, 09 Jan 2006 15:51:48 +0000; Don't believe him. Charlie Brown KNOWS that EVERYONE has noticed. -- 73 from Ian GM3SEK _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.c; /archives//html/Amps/2006-01/msg00265.html (8,542 bytes)
13. Re: [Amps] Westinghouse BC Ammeter QX-37 (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 09 Jan 2006 16:11:17 +0000; For high order IMD - which is what affects your neighbours most, the improvement can be higher. It gets you a slightly higher electricity bill, and (hopefully) thanks and respect from your fellows. I; /archives//html/Amps/2006-01/msg00266.html (10,542 bytes)
14. Re: [Amps] Westinghouse BC Ammeter QX-37 (score: 1): Author: Bill Turner <dezrat1242@ispwest.com>; Date: Mon, 09 Jan 2006 08:12:48 -0800; ORIGINAL MESSAGE: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Ok, makes sense. I'm not near any active hams, so I've never noticed what you have. I do take exception to the part about "not tech; /archives//html/Amps/2006-01/msg00267.html (10,049 bytes)
15. Re: [Amps] Westinghouse BC Ammeter QX-37 (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 09 Jan 2006 16:17:35 +0000; Whether it's amplifiers, car exhaust or personal hygiene, clean is lost when surrounded by dirty. Change the balance bit by bit, and suddenly dirty stands out like a sore thumb. Steve _______________; /archives//html/Amps/2006-01/msg00268.html (10,160 bytes)
16. Re: [Amps] Westinghouse BC Ammeter QX-37 (score: 1): Author: "k7rdx" <k7rdx@charter.net>; Date: Mon, 9 Jan 2006 08:36:30 -0800; Most of the better commercial people are also hams...At least here in the USA...Jim.. -- Original Message -- From: "Bill Turner" <dezrat1242@ispwest.com> To: "k7fm" <k7fm@teleport.com>; "Steve Thomps; /archives//html/Amps/2006-01/msg00271.html (11,034 bytes)
17. Re: [Amps] Westinghouse BC Ammeter QX-37 (score: 1): Author: "Tom Cathey" <K1JJ@comcast.net>; Date: Mon, 9 Jan 2006 11:39:26 -0500; Generally, on most bands, we can "hide" in the band crud when the amp is between -25 to -30db 3rd order. This includes bands like 40M at night, 20M during a contest, 160M when the band is QRN noisy,; /archives//html/Amps/2006-01/msg00273.html (11,093 bytes)
18. Re: [Amps] Westinghouse BC Ammeter QX-37 (score: 1): Author: Bill Turner <dezrat1242@ispwest.com>; Date: Mon, 09 Jan 2006 08:44:09 -0800; ORIGINAL MESSAGE: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Ok, point taken, thanks. One question, though. How exactly does negative feedback reduce IMD? Is it by preventing or reducing overd; /archives//html/Amps/2006-01/msg00274.html (9,470 bytes)
19. Re: [Amps] Westinghouse BC Ammeter QX-37 (score: 1): Author: "Tom Cathey" <K1JJ@comcast.net>; Date: Mon, 9 Jan 2006 12:03:11 -0500; Hi Bill, I'll encourage the other guys answer the finer details of how NFB works... But, for every DB of negative feedback, you get a db of IMD improvement. And also, for every db of negative feedba; /archives//html/Amps/2006-01/msg00277.html (11,013 bytes)
20. Re: [Amps] Westinghouse BC Ammeter QX-37 (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Mon, 9 Jan 2006 18:11:22 +0100; The primary reason why negative feedback reduces IMD is that it reduces the curvature of the transfer functions of the active devices. By feeding a portion of the output back to the amplifier input i; /archives//html/Amps/2006-01/msg00279.html (11,875 bytes)

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