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H. Adam Stevens wrote:
I have a class A audio amp (BAT VK500) and it definitely gets cooler when The Carmina Burana gets louder. Take a lesson from the power companies. They run coolest when their output impedances are the lowest. :-) -- 73, Cecil http://www.qsl.net/w5dxp -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
Until one breaker goes and the rest of the grid can't handle the load.
;^))))))))) 73, H. "W5DXP" wrote in message ... H. Adam Stevens wrote: I have a class A audio amp (BAT VK500) and it definitely gets cooler when The Carmina Burana gets louder. Take a lesson from the power companies. They run coolest when their output impedances are the lowest. :-) -- 73, Cecil http://www.qsl.net/w5dxp -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
Floyd Davidson wrote:
"Unless of course that shuts down, or even destroys the source device in the process." Floyd was commenting on H. Adam Stevens` suggestion of how to measure source impedance. I appended the gist of H.`s comment in parentheses to define "that" in Floyd`s statement. I am sorry I misplaced the quotation marks which should have been placed as they are above. I don`t disagree with either Floyd or H. Best regards, Richard Harrison, KB5WZI |
Richard,
If you do indeed need help, it's far more help than I can give you. My posting was not in jest, nor was it to poke fun at you or your postings. I was dead serious about it. Cheers, Tom Richard Clark wrote in message . .. On 17 Aug 2003 21:12:52 -0700, (Tom Bruhns) wrote: Richard, I'm seriously worried about you. Was that posting, and many of the others I've seen from you recently, a plea for help? I'm sure we can come up with appropriate help lines for you to call, if only you will tell us what's at the root of your problem. Regards, Tom Hi Tom, You only need drive down the road some 25 minutes if you are serious. Less time than that spent in all these postings that have you worried. I've driven to Mukilteo 5 days a week for several years and its not all that far and almost a straight shot especially with you on the speedway. When can I expect you? ;-) 73's Richard Clark, KB7QHC |
H. Adam Stevens wrote:
"W5DXP" wrote in message Take a lesson from the power companies. They run coolest when their output impedances are the lowest. :-) Until one breaker goes and the rest of the grid can't handle the load. ;^))))))))) 73, H. Incidentally, the argument that Thomas Edison used to prove that power distribution systems would never be AC is that they would burn themselves up trying to provide maximum power transfer. He never conceived that they would be more interested in efficiency than maximum power transfer. :-) So why can't we have a 95% efficient RF power amplifier? -- 73, Cecil http://www.qsl.net/w5dxp -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
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Roy Lewallen wrote:
H. Adam Stevens wrote: If the source is matched to the line, is the reflected wave dissipated as heat in the source? Nope. I've shown this definitively a number of times on this newsgroup. Yep, by assuming something that is true only by definition. :-) If the source is hidden in a black box and includes a circulator with load, the reflected wave *IS* dissipated as heat in the source. For some phases of reflected energy, the dissipation does increase. You say it is because of the mismatch but the mismatch is because of the reflected waves. So which came first, the mismatch or the reflected waves? I suggest that the mismatch will not happen until the reflected waves arrive. Try it with a one second long transmission line. -- 73, Cecil http://www.qsl.net/w5dxp -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
Aren't the switching amps used in AM broadcast highly efficient?
Do folks still use class C amps in FM service? (It's been decades) H. NQ5H "W5DXP" wrote in message ... H. Adam Stevens wrote: "W5DXP" wrote in message Take a lesson from the power companies. They run coolest when their output impedances are the lowest. :-) Until one breaker goes and the rest of the grid can't handle the load. ;^))))))))) 73, H. Incidentally, the argument that Thomas Edison used to prove that power distribution systems would never be AC is that they would burn themselves up trying to provide maximum power transfer. He never conceived that they would be more interested in efficiency than maximum power transfer. :-) So why can't we have a 95% efficient RF power amplifier? -- 73, Cecil http://www.qsl.net/w5dxp -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
I've made homebrew transmitters with efficiencies exceeding 85%. See for
example Fig. 2.97 on p. 2.36 of the new _Experimental Methods in RF Design_. Sokal and Sokal got better than 90% as I recall with their Class E designs. Roy Lewallen, W7EL |
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