Ralph, A good rule of thumb to follow is simply this: the maximum carrier output you're going to safely get out of your separate linear amplifier is limited to HALF of the plate dissipation of your linear's tube(s)...
Example: I sometimes drive my HB 2 x 813 as a linear for AM. Each tube has a plate dissipation of 125-watts. HALF of that is 62.5-watts, so with 2 tubes, it'll be 125-watts carrier output MAXIMUM. I adjust my drive to the linear, watching the output power meter, until 125-watts is achieved. I might "tweak" the plate tuning capacitor after this is done. It takes some 10-12 watts of AM to get 125-watts out of the 813s. When speaking into the mic, I always watch the trapezoidal pattern on my SB-610 'scope, & make sure I have enough audio. Hope this helps! ~73~ Eddy VE3CUI - VE3XZ ----- Original Message ----- From: "Ralph Daniels" <[EMAIL PROTECTED]> To: <amradio@mailman.qth.net> Sent: Monday, November 22, 2004 7:54 AM Subject: [AMRadio] AM Usage with Linear AMPS > Hi all, > > I feel this subject must have been covered many times but I just can't find it. > > Specifically, I have a Heathkit HX-10 Marauder driving an Ameritron AL-811H > on CW and SSB and would also like to try it on AM. The driving power on AM > is 25 watts. > > Is this a correct use of the amplifuer and if so what are some operationa > guidelines as regards i/p and o/p power, duty cycle, cooling etc. > > Thanks in advance, > > Ralph Daniels, N1SK > > > > ______________________________________________________________ > AMRadio mailing list > Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net >
