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41. Re: [Amps] 4CX250 IMD (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Sun, 30 Sep 2007 09:07:50 -0400; Two tone PEP has been mentioned several times as the reference used for the 4CX250R under discussion. Oh yes it has. I asked how Eimac measured PEP in the 50's. Some of the youngsters on here might b; /archives//html/Amps/2007-09/msg00510.html (8,595 bytes)
42. Re: [Amps] 4CX250 IMD (score: 1): Author: "Peter Voelpel" <df3kv@t-online.de>; Date: Sun, 30 Sep 2007 15:15:52 +0200; The spec sheet can be found here: http://www.g8wrb.org/data/Eimac/4CX250R.pdf SSB data is on page 2, at 470W output DC input is 750W, IMD -23db 73 Peter Input power is 500WDC, Output is 470W PEP, not; /archives//html/Amps/2007-09/msg00511.html (8,881 bytes)
43. Re: [Amps] 4CX250 IMD (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Sun, 30 Sep 2007 10:08:52 -0400; That is a 1982 revision of my 1961 sheet. thanks for posting it. They added a line indicating a "brief tune up" power input as well as one for tune up screen current. Interesting as I dont believe Iv; /archives//html/Amps/2007-09/msg00513.html (10,008 bytes)
44. 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)
45. Re: [Amps] 4CX250 IMD (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sun, 30 Sep 2007 14:53:58 -0400; DC input power is power indicated on plate voltage and current meters. It is an average power. it would indicate the sum of the two tones in respect to input power. RF output power is PEP, which woul; /archives//html/Amps/2007-09/msg00517.html (9,553 bytes)
46. [Amps] 4CX250 IMD (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 30 Sep 2007 22:32:29 +0200 (CEST); 4CX250R under discussion.< But which RCA were talking about, I don't know. They don't say. Oh yes it has. I asked how Eimac measured PEP in the 50's. Some of the youngsters on here might be surprised; /archives//html/Amps/2007-09/msg00518.html (8,520 bytes)
47. 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)
48. Re: [Amps] 4CX250 IMD (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Sun, 30 Sep 2007 17:11:01 -0400; I was surprised to learn that the silicon point contact diode was patented in 1906. Steve And it was strictly a curiosity until much later. When did it enter into mass production? SSB was developed i; /archives//html/Amps/2007-09/msg00521.html (9,401 bytes)
49. Re: [Amps] 4CX250 IMD (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Sun, 30 Sep 2007 17:17:01 -0400; How did RCA sneak in here? I dont have any RCA specs on the 250 family to compare to Eimac. But there are plenty who will pay loads of money for a meter that reads to 3 decimals but be absolutely clu; /archives//html/Amps/2007-09/msg00522.html (9,455 bytes)
50. Re: [Amps] 4CX250 IMD (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Sun, 30 Sep 2007 23:18:27 -0500; Hi Carl, I haven't looked at the 4cx250 sheets in a long time so I just looked at the 4cx250B Eimac, 4cx250B STC and 4cx250R Eimac data sheets. Power should be referred to as PEP and average power,; /archives//html/Amps/2007-10/msg00000.html (9,361 bytes)
51. [Amps] 4CX250 IMD (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 1 Oct 2007 06:20:07 +0200 (CEST); Carl asked: compare to Eimac.< No, but I have. Which was why I gave those numbers. 73 Peter G3RZP _______________________________________________ Amps mailing list Amps@contesting.com http://lists.co; /archives//html/Amps/2007-10/msg00001.html (6,509 bytes)
52. 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)
53. 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)
54. Re: [Amps] 4CX250 IMD (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Mon, 1 Oct 2007 09:17:21 -0400; Thats exactly what I was getting at. Fairly good, reasonably accurate, dont exactly give me a warm feeling. Having worked in a RF lab with 50's era test equipment in the early 60's I always had the f; /archives//html/Amps/2007-10/msg00005.html (8,908 bytes)
55. 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)
56. Re: [Amps] 4CX250 IMD (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Mon, 1 Oct 2007 17:29:41 +0200; The 1961 RCA data sheet for the 4CX250B can be found at: http://frank.pocnet.net/sheets/079/7/7203.pdf 73/ Karl-Arne SM0AOM -- Original Message -- From: "Steve Thompson" <g8gsq@eltac.co.uk> To: <amps; /archives//html/Amps/2007-10/msg00011.html (8,783 bytes)
57. Re: [Amps] 4CX250 IMD (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Mon, 1 Oct 2007 12:35:46 -0400; Thanks, that is a great site. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2007-10/msg00013.html (9,967 bytes)

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