Manpack VHF amplifier for MQ-25 and MQ-77 VHF radio.
Used by the US military from early 1970s until mid 1980s, designated AM-4477/GRC and RB-25.
Used by the IDF during the Peace for Galilee War (1982) and the Security Zone Conflict (1982-2000).
RF power: 6 or 30 Watts; power source: 24 Volts DC (with vehicle adapter) or rechargeable nickel-cadmium battery.
Manufactured by Tadiran, Israel.