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1. [Amps] plate dissipation and duty factor (score: 1): Author: "John Lyles" <jtml@losalamos.com>; Date: Wed, 11 Mar 2009 23:55:49 -0700; You are correct that RTTY is basically 100% on like FM, at least during a burst of transmission. So this is limited by the average plate dissipation of the tube, not to exceed XXX watts or KW. Therma; /archives//html/Amps/2009-03/msg00339.html (11,649 bytes)
2. Re: [Amps] plate dissipation and duty factor (score: 1): Author: Jeff Blaine <keepwalking188@yahoo.com>; Date: Thu, 12 Mar 2009 02:16:41 -0500; Hi John, Thanks very much for the info. That's a great bit of data there. And it's great to have that confirmation. For the duty cycle, the ARRL if I remember correctly calls out the duty cycles for; /archives//html/Amps/2009-03/msg00340.html (13,693 bytes)
3. Re: [Amps] plate dissipation and duty factor (score: 1): Author: "Rex Lint" <rex@lint.mv.com>; Date: Thu, 12 Mar 2009 11:30:01 -0400; I would think that PSK would be the same as RTTY - you have a tone on all the time - just changing its phase -Rex K1HI Rex Lint Merrimack, NH --Original Message-- From: amps-bounces@con; /archives//html/Amps/2009-03/msg00343.html (14,491 bytes)
4. Re: [Amps] plate dissipation and duty factor (score: 1): Author: Jeff Blaine <keepwalking188@yahoo.com>; Date: Thu, 12 Mar 2009 12:28:01 -0500; Hi Rex, It varies from 50% at idle to about 90% max, depending on data content. Source KK7UQ: http://kk7uq.com/html/download/IMD%2520Presentation.ppt He's the guy who came up with that nifty IMD mete; /archives//html/Amps/2009-03/msg00348.html (16,533 bytes)
5. Re: [Amps] plate dissipation and duty factor (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Thu, 12 Mar 2009 14:02:35 -0400; This would work IF you were limited only by plate dissipation, but in reality there are other factors such as cathode emission, grid dissipation, and secondary emission. With most tubes you are still; /archives//html/Amps/2009-03/msg00349.html (16,855 bytes)
6. Re: [Amps] plate dissipation and duty factor (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Thu, 12 Mar 2009 18:57:44 +0100; The assumption that duty cycle * peak dissipation = average dissipation holds so long as the pulse lengths or envelope variations are short compared to the thermal time constant of the anode structur; /archives//html/Amps/2009-03/msg00350.html (17,278 bytes)
7. [Amps] plate dissipation and duty factor (score: 1): Author: "John Lyles" <jtml@losalamos.com>; Date: Thu, 12 Mar 2009 11:15:11 -0700; If you have a CCS spec for 100 Watts plate dissip (Pd), then don't list plate dissipation going up to 500 watts for unprocessed SSB. Unless you are talking intermittent power to the plate, similar to; /archives//html/Amps/2009-03/msg00351.html (10,173 bytes)
8. Re: [Amps] plate dissipation and duty factor (score: 1): Author: Jeff Blaine <keepwalking188@yahoo.com>; Date: Thu, 12 Mar 2009 14:15:29 -0500; Gentlemen, I was thinking about this anode disipation capability today as well. The ability to pull the heat off the plates is going to be limited by the thermal gradient between the anode face and t; /archives//html/Amps/2009-03/msg00355.html (19,924 bytes)
9. Re: [Amps] plate dissipation and duty factor (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Thu, 12 Mar 2009 23:13:04 -0400; For SSB duty factor should vary with voice characteristics. I would guess that there would be at least a 2:1 variance or more at the extremes, maybe more. My voice which is a bit on the coarse side h; /archives//html/Amps/2009-03/msg00369.html (11,517 bytes)
10. Re: [Amps] plate dissipation and duty factor (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Thu, 12 Mar 2009 23:17:41 -0400; How about water cooling? That will greatly increase the plate dissipation capability, but how far can you go before cathode emission becomes the limiting factor, or secondary emission? 73 Roger (K8RI; /archives//html/Amps/2009-03/msg00370.html (21,674 bytes)

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