Hi Dave thanks for taking the time to get back to me. I thought the same but it also does in with the dummy load as well with the power set at 0. Mike -- View this message in context: http://elecraft.365791.n2.nabble.com/KX3-has-a-ping-noise-tp7573175p7573180.html Sent from the Elecraft mailing list archive at Nabble.com.