Well that must be the result of what Jack said about loading the aux buss if the KAT is off when you turn on the K3. ----- Chuck, KE9UW -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-KPA500-KAT500-revs-4-83-1-38-1-58-tp7584490p7584600.html Sent from the Elecraft mailing list archive at Nabble.com.