GRC-105 is a synthesized VHF & UHF ground-to-air transceiver covering the commercial and military aviation frequencies; available as VHF only, UHF only ora VHF+UHF unit. It complies with rugged MIL-STD 810E environmental and EMC specifications. GRC-105 is suitable for ground ATC roles, at military air bases, shipboard control or commercial flight control. It has a modular design, microprocessor control and software programming. GRC-105 is readily configurable for a wide variety of ATC interfaces, and is compliant with digital and analog crypto equipment. The equipment can operate both on 110/220 mains AC supply with automatic switch over to 12/24V standby batteries for continuous opera-tion.