What is prc-77?

The PRC-77 is a portable, manpack, single sideband transceiver used by the United States military for short-range tactical communications. It was introduced in the early 1970s as a replacement for the AN/PRC-25, and was used extensively during the Vietnam War. The PRC-77 operates on the HF and VHF frequencies, and has a range of up to 10 miles in line-of-sight conditions. It can be powered by a rechargeable battery or an external power source, and is capable of both voice and data transmissions. Despite being retired by the US military in the 1990s, the PRC-77 is still used by some military and law enforcement organizations around the world.