Last weekend I found that I was loosing quite a bit of power when combining the outputs of two 300W VHFDesign 1296MHz power amplifiers through a hybrid-ring coupler (rat race). The power was going into the isolated port of the output hybrid-ring coupler, so that pointed out to a phase mismatch between the two amps. I don’t have an adjustable phase shifter handy (bought one off eBay yesterday), so I decided to try a simple change in cable length using adapters. Just one NF-to-NM “port saver” adapter was enough to equalize the phases at the amplifiers’ inputs such that the power appearing at the output coupler’s isolated port is now just 4W, which boosted my output to the antenna from 520W to 600W!