Jeremy, KB8LFA wrote: I also read quite a bit about compressing L2 to 70% or so instead of 90% for low power problems. Have not tried either, but compressing L2 seems like a much easier task than swapping the resistors. I will try that tonight and let people know how I fare.
--------------------------------------- The purpose of adjusting L2 spacing is to change the roll-off characteristic of the output low-pass filter. It won't do much (or anything) for the output on 40. If the output on 20 meters is more than about 0.6 watts LOWER than the output 40, squeezing the turns on L2 will often increase the 20 meter output by changing the high-frequency roll-off characteristic of the filter. It's a BAD idea to try to get as much output on 20 as you have on 40. If the 20 meter output is more than about 0.3 watts below the output on 40, your output filter is NOT attenuating the harmonics like it should. You are emitting excessive harmonic energy. The KX1 was designed to be a 'clean' rig and to be clean the 20 meter output must be 0.3 to 0.6 watts lower than the output on 40. About those two resistors, the original recommendation came from Gary I believe. Changing them will increase the overall output of the KX1 on all bands if it is below spec. He's quoted as saying: "...reducing R11 in Q5's emitter to 3.3 to 5.6 ohms and increasing R30 on Q6's base to 27-33 ohms... R30 should not be made larger than 33 ohms to prevent problem when the atu operates, and unless a spectrum analyzer is available to check the transmitter output for purity." Ron AC7AC _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
