Running DC input voltage close to the specified limit of 15.0 V will improve IMD. Perhaps the results you posted were with lower input voltage. 73, Bill W4ZV -- View this message in context: http://elecraft.365791.n2.nabble.com/High-Tx-IMD-with-new-K3s-10-tp7627317p7627318.html Sent from the Elecraft mailing list archive at Nabble.com.