I meant not F1 but the detection of an unmodulated carrier. Sorry, 73, Mauri I4JMY > With a coherent method and slow F1 you can go much downer than noise > floor (method used @ 137 KHz). -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com