I have been having a great time building and enhancing my Microwave radios. The first one is my dual band 5 and 10 GHz radio. The IF rig is a Kenwood 751a and is Phased locked (which really helped) and runs about 4 to 5 watts output.
This is my most recent creation my 24GHz rig. IF is a Yaesu 817 with DB6NT transverter preamp and a commercial 2 watt amplifier. Paul N6DN is getting ideas for his version.