Hello, Problem solved. New RD06HVF1 instead of RD06HHF1 and the output is stable. Regards Rodrigo ct1bxt -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-5143-ERR-TXG-on-10m-6m-tp7576424p7576816.html Sent from the Elecraft mailing list archive at Nabble.com.