... > Hi Don, this would be the third time I've had to re-calibrate CAL-TPA!!!!! It's been changing on its own......maybe K100 possessed? ... As discussed in this old email thread, CAL TPA would be overwritten in my K2 after trying to TUNE on the wrong antenna: http://elecraft.365791.n2.nabble.com/PA-gone-crazy-next-episode-and-solution-td367668.html -John AC6SL