600w 23cm LDMOS Amplifier by W6PQL This project began when I was lucky enough to locate some surplus XRF-286 LDMOS transistors; I thought it might be nice to have a solid-state replacement for my GS-15B amplifier, which had been in service here for 5 years. http://www.w6pql.com/600w_23cm_LDMOS_amplifier.htm