I have always used a 12V 100A server power supply with a chassis and shortwave radio. Initially, the long cable caused problems, as well as the high voltage drop in the shortwave radio, resulting in insufficient power output. However, once I replaced the cable, everything worked fine. The power supply has two chassis, one for shortwave radio, one for tuning, and a QRP machine. It also includes a lamp, charger, and an adjustable power supply.