Jim, Read the following document, which might help. There is a spur generated on 80 meters in some KPA100's caused by a resonance in the TR switch components. Easily fixed with a 1K resistor soldered across one of the inductors. Won't help 40 meters though. http://www.elecraft.com/manual/E740035E%20KPA100%20errata%20rev%20C-3.pdf 73 Gary, N7IR