AMPLIFIER/PREPOST SELECTOR consists of RF preselector and broadband power amp. Pre-selector operates in four bands 1.8-3.6 3.6-7 7-14 and 14-30 Mhz. Microprocessor-controlled unit has no front panel controls except ON-OFF and indicators for OV, DE, OVL, ATT, BITE, TUNE; unit is remotely controlled by the associated transmitter/receiver system. Frequency is selected by twelve Kilovac(or equal) HC-1 vacuum relays and nine mini-coax relays along with motor interface adapters, plus silver-plated coils and 3-gang variable capacitor. Relays actuated by driver transistors. RF power amp uses four transistors S15-28 T9-0664 and two MRF-466 as output amp-lifiers. P/O GRC-215 HF-SSB system; no further info at this time. Requires 115/230 VAC 50-60 Hz; 4.5x19x17 46 lbs sh. (D3E) Unused