Can anyone suggest a source for a schematic of a simple two tone audio generator suitable for transmitter and amplifier testing? Thanks, John K2SY -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com Search: http://www.contesting.com/km9p/search.htm