Hi Doug, i have done the Gold pin modification K3 #2652 ( PA and Front Panel). 73, Roger -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-TX-calibration-fails-after-KXV3B-and-SYN3A-upgrade-tp7606337p7606369.html Sent from the Elecraft mailing list archive at Nabble.com.