The information was taken from the Radio Communication Handbook as stated. The amp was also called the Frinear-400. BillW KB7YUM -- 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