This amplifier takes advantage of the proliferation of
surplus cellular 26v RF boards. It combines two 150 watt boards
using 3db hybrid couplers. I made the couplers using FR4 on the
input, and .062 PTFE on the output.
Input power required for 300w out is about 25w.
Supply voltage needed is 26-28v @ 23a.
It has full relay sequencing, including transverter and radio
control lines, and a low loss transfer switch.