The AN/PRC 77 Radio Set is a manpack, portable VHF FM combat-net radio transceiver manufactured by "Associated Industries" and used to provide short-range, two-way radiotelephone voice communication. AN/PRC translates to "Army/Navy, Portable Radio, Communication.

Freq range: 30-75.95 MHz (920 Channels using 50kHz steps)
Range: up to 8km
Power Output: 1.5-2.0W

The AN/PRC 77 entered service in 1968 during the Vietnam War as an upgrade to the earlier AN/PRC 25. It differs from its predecessor mainly in that its final power amplifier stage is solid state and not vacuum tubes.