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1. [Amps] 4CX250 IMD (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 1 Jul 2002 12:25:08 -0700; Compared to poor regulation, yes. Compared to a well-engineered zener shunt screen regulator, probably not a significant improvement. To arrive at good linearity with a 4cx250B/R/BC/7203, load for le; /archives//html/Amps/2002-07/msg00006.html (8,103 bytes)
2. [Amps] 4CX250 IMD (score: 1): Author: g0ruz@btinternet.com (Conrad G0RUZ); Date: Mon, 1 Jul 2002 23:30:01 +0100; Compared to poor regulation, yes. Compared to a well-engineered zener shunt screen regulator, probably not a significant improvement. To arrive at good linearity with a 4cx250B/R/BC/7203, load for le; /archives//html/Amps/2002-07/msg00023.html (8,275 bytes)
3. [Amps] 4CX250 IMD (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 1 Jul 2002 15:33:49 -0700; ** Would you trust a stock buy recommend from a brokerage that gave salesmen a commission on stock sold? ** A two-tone imd test is about as useful for evaluating splatter as teats on a boar hog. - R; /archives//html/Amps/2002-07/msg00024.html (8,624 bytes)
4. [Amps] 4CX250 IMD (score: 1): Author: oz5tg@post2.tele.dk (Verner Topsøe-Jensen OZ5TG); Date: Tue, 2 Jul 2002 00:30:41 +0200; The tuning procedure described in "The VHF/UHF DX BOOK" Chapter 6 is excellent. That will bring you to a point where the G2 current is very low. (and you have max output) Using that approach will als; /archives//html/Amps/2002-07/msg00025.html (9,222 bytes)
5. [Amps] 4CX250 IMD (score: 1): Author: g0ruz@btinternet.com (Conrad G0RUZ); Date: Mon, 1 Jul 2002 23:48:27 +0100; significant ** Would you trust a stock buy recommend from a brokerage that gave salesmen a commission on stock sold? Huh what does that mean? ** A two-tone imd test is about as useful for evaluating; /archives//html/Amps/2002-07/msg00029.html (8,885 bytes)
6. [Amps] 4CX250 IMD (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 1 Jul 2002 18:06:02 -0700; ** I built a 2 x 4cx250 2m AB1 amplifier with a conservatively run zener shunt screen regulator. It was as clean as Eimac claimed. // It means that foxes should probably not be entrusted with hen-ho; /archives//html/Amps/2002-07/msg00030.html (9,040 bytes)
7. [Amps] 4CX250 IMD (score: 1): Author: g0ruz@btinternet.com (Conrad G0RUZ); Date: Tue, 2 Jul 2002 02:19:55 +0100; the impedance and of ** I built a 2 x 4cx250 2m AB1 amplifier with a conservatively run zener shunt screen regulator. It was as clean as Eimac claimed. // It means that foxes should probably not be e; /archives//html/Amps/2002-07/msg00032.html (10,372 bytes)
8. [Amps] 4CX250 IMD (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 1 Jul 2002 19:25:07 -0700; 1. Because most designers assume that a 5w zener can work well at 5w. 2. A spectrum analyzer is not the right measurement tool. 3. Such a test should measure p-p screen V - with voice-mod - vs total; /archives//html/Amps/2002-07/msg00035.html (11,909 bytes)
9. [Amps] 4CX250 IMD (score: 1): Author: w2fca@cs.com (w2fca@cs.com); Date: Tue, 02 Jul 2002 07:37:39 -0400; 'Scuse me, but what is a "high IMD sensitive VHF/UHF Rx"? I could see an Rx sensitive to high signal strength, but if somebody is transmitting at 144.200 and has output products at 144.210 isn't any; /archives//html/Amps/2002-07/msg00041.html (7,674 bytes)
10. [Amps] 4CX250 IMD (score: 1): Author: g0ruz@btinternet.com (Conrad G0RUZ); Date: Tue, 2 Jul 2002 13:33:33 +0100; 'Scuse me, but what is a "high IMD sensitive VHF/UHF Rx"? I could see an Rx sensitive to high signal strength, but if somebody is transmitting at 144.200 and has output products at 144.210 isn't any; /archives//html/Amps/2002-07/msg00042.html (8,800 bytes)
11. [Amps] 4CX250 IMD (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 2 Jul 2002 05:52:38 -0700; good question, Frank cheerz - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-07/msg00043.html (7,853 bytes)
12. [Amps] 4CX250 IMD (score: 1): Author: w4zcb@mchsi.com (Harold E. Johnson); Date: Fri, 28 Jun 2002 08:28:49 -0400; G3SEK is vacationing in the states at the moment, but he gets = significant improvement in IMD suppression with the tube by holding the = screens within millivolts using active regulation. W4ZCB -- S; /archives//html/Amps/2002-06/msg00280.html (6,345 bytes)
13. [Amps] 4CX250 IMD (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Thu, 27 Sep 2007 19:06:25 -0400; According to my full size Eimac manual ( the yellow one with the multi page spec loose leaf sheets) the only 4CX250 style tube with decent IMD is the 4CX250R/7580 which was used in a lot of military; /archives//html/Amps/2007-09/msg00434.html (8,486 bytes)
14. Re: [Amps] 4CX250 IMD (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Thu, 27 Sep 2007 20:16:39 -0400; Hi Carl, I actually said (about a dozen times)....... "Eimac uses two tone IM referenced against a single tone of the test. The ARRL uses IM referenced against PEP." I assumed people know a two tone; /archives//html/Amps/2007-09/msg00436.html (8,928 bytes)
15. Re: [Amps] 4CX250 IMD (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Thu, 27 Sep 2007 20:22:00 -0400; I'm sorry let me correct this **: The last sentence should be I _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2007-09/msg00438.html (8,421 bytes)
16. Re: [Amps] 4CX250 IMD (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Thu, 27 Sep 2007 20:29:46 -0400; I dont read all of your posts, especially when they ramble on and drift off. You certainly enjoy mentioning nichrome on at least a daily basis. Are you hoping Rich is lurking and youre just needling; /archives//html/Amps/2007-09/msg00439.html (9,792 bytes)
17. Re: [Amps] 4CX250 IMD (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Thu, 27 Sep 2007 21:20:10 -0700 (PDT); Hi Carl, Check the 8904/4CX350FJ. It has superb IMD specs and will fit the socket. A retrofit will be required for the heater supply. 73 & Good evening, Marv WC6W http://wc6w.50webs.com/ ____________; /archives//html/Amps/2007-09/msg00445.html (10,160 bytes)
18. Re: [Amps] 4CX250 IMD (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Fri, 28 Sep 2007 08:30:25 +0200 (CEST); Carl, I think there's tendency to use 'relative to PEP' over here, although often without stating the fact, and relative to one tone of a two tone signal in some quarters in the US, such as Eimac. An; /archives//html/Amps/2007-09/msg00450.html (7,159 bytes)
19. 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)
20. [Amps] 4CX250 IMD (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Fri, 28 Sep 2007 08:53:24 +0200 (CEST); Pappenfus suggests that -50dB is possible with 4CX250B in super cathode driven, although he doesn't say at what power. There's a short description of a tx using one 4CX250B driving 3 driving 4 4CX500; /archives//html/Amps/2007-09/msg00452.html (6,569 bytes)

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