In a message dated 12/19/03 4:44:36 AM, [EMAIL PROTECTED] writes:
> I spewed my drink all over the monitor when on Friday 19 December 2003 > 01:41, > [EMAIL PROTECTED] said (and I am -not- making this up!):: > > > In a message dated 12/18/03 10:41:35 PM, [EMAIL PROTECTED] writes: > > > It has been my experience that of everything is workig right, and the > > > output circuit is efficiently designed, the maximum reliable power > > > output from a linear amp running standard AM is about equal to half > > > the total rated plate dissipation of the tube(s). i.e. for a pair of > > > 6146's, 20-25W carrir, 80-100W PEP. > > > > Good rule of thumb. I've operated my home brew 3-1000Z linear on legal > > max AM. The tube is dissapating about 800 watts under carrier only condx > > in this mode and the plate runs a nice bright yellow-orange! > > > Dennis. what are you calling "legal max AM"? > > The only legalities we have anymore, is 1500w PEP output. > > Depending on the natural asymetricalness of your voice, will depend on how > much PEP output you have (which is quite difficult, at best, to measure). > > The Rule of thumb is, if you modulate a carrier to 100% with a sinewave, the > > Peak Envelope Power Output is 1,500 watts. That would the carrier > power(x4). > or 375w of carrier output, or (roughly) 500w DC input to the final. > > The problem with that is, we don't speak in sine-waves ;-) > > For more information on figuring PEP power, see > http://www.qsl.net/wa5bxo/amplitude-modulation-and pep.htm > > For a great write up on asymetrical audio, see > http://www.qsl.net/wa5bxo/asyam/aam3.html > > Dig around the website. Be careful, though - you might learn something ;-) > > So? My voice happens to be virtually symetrical so 375 watts of carrier for 1500 watts PEP at 100% modulation is close enough for me. Looks "legal" on the scope too. Also, running a linear which gives about 33% efficiency at carrier only results in "about" 1200 watts input, 800 watts of which is being dissapated as heat. Your 500 watts would be for a class C PA and is about what my T368s run and "I'm not making this up." Dennis D. W7QHO Glendale, CA Dennis D. W7QHO Glendale, CA --- StripMime Report -- processed MIME parts --- multipart/alternative text/plain (text body -- kept) text/html The reason this message is shown is because the post was in HTML or had an attachment. Attachments are not allowed. To learn how to post in Plain-Text go to: http://www.expita.com/nomime.html ---
