On 2011-08-15, at 12:05 AM, Don Cunningham wrote: > I too would be interested in the L4B's performance/use on AM. I may use the > DX-60 or T4XC as the driver, but same question, hi. > 73, > Don, WB5HAK > _______________________________________________ > Drakelist mailing list > Drakelist@zerobeat.net > http://mailman.zerobeat.net/mailman/listinfo/drakelist
Hi Guys, A good rule of thumb to follow when using any LINEAR amplifier for AM fone is simply this: the MAXIMUM carrier output power obtainable out of it is equal to the plate dissipation power of your final tubes divided by two... Example: I use a pair of paralleled 813 tubes in my HB amplifier---each tube has a plate dissipation of 125-watts, giving me a TOTAL dissipation of 250-watts. The most AM carrier output I can expect to get out of my set-up is 2 x 125 = 250-watts DIVIDED by 2 = 125-watts. Adjust your drive until such time as the correct power output from the amplifier is obtained---then "tweak" the plate tuning control of the amp one final time for maximum output (it will be minimal)... This is the very set-up I used for years here at VE3CUI, using a HB AM transmitter as an exciter...the output from the exciter was some 10-12 watts, or so, & I got 125-watts out of the 813s---a VERY worthwhile "boost" in my station's AM performance...! ~73~ de Eddy VE3CUI - VE3XZ
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