hi AMSAT ,,,, ,, i looked around some more, and found that 5.0 W or less should work. thanks to N1DID web site and the AMSAT AO-07 page linked from heavens-above.com for the good info. i think i will work RX only for a while to get the feel for SSB doppler first. thank you ! --,,, ,,,-- kf0g cm97 robert