Consists of radio transmitter modulator md-637/frt-72; transmitter control c-6619/frt-72; indicator-protector id-1294/frt-72; power supply pp-4352/frt-72; oper pwr rqmt 460 vac, 50 to 60 hz, 3 phase; o/a dims 37.22 in. D; 48.0 in. W; 78.0 in. H; generates and selects any freq in 30 to 150 kc range