There was a serious spur problem with K3's that have C3 installed. Read about it at: http://elecraft.365791.n2.nabble.com/Unstable-KPA3-100W-td5742537.html#a5742613 73, Joe W8JH K3 1713 -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-TX-spurs-tp5936691p5943712.html Sent from the [K3] mailing list archive at Nabble.com.