Finally i found the problem. Q5 (RD15HVF1) in the LPA died. After replacing it the K3 "works as designed". So no issue with the FW. 73 -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-FW-5-14-tp7601251p7601279.html Sent from the Elecraft mailing list archive at Nabble.com.