It's a nitpicking point, but if 2 tone IMD is about -30dBc or worse, then you can't rely on PEP being 4 x single tone or 2 x average power. It's almost certainly lower. Steve -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com Search: http://www.contesting.com/km9p/search.htm