Wayne N6KR has addressed the matter of K1 transmit efficiency in his note at http://www.elecraft.com/TechNotes/k1_battery_op.htm
Wayne's formula shows the most efficient power setting as a function of supply voltage. It's easy to remember: square the supply voltage and divide by 25. Basically, impedances need to be matched at DC in for greatest DC efficiency, just as they do at RF out for greatest RF efficiency. As the battery voltage decreases, the optimal K1 power setting will also decrease, but quadratically--not linearly. The voltage that should be used in the calculations is that displayed by the K1, that is, after reduction for the loss in the polarity-protection diode. 73, Paul W8TM ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
