![]() ![]() The transmitter spurious emissions were cleaned up to create less interference to nearby receivers. Problems were encountered in Vietnam with the combination as described in the NESTOR article. ![]() These include the TSEC/KY-38 NESTOR equipment used in Vietnam and the later KY-57 VINSON family. The PRC-77 transmitter audio bandwidth was widened to give it the ability to use voice encryption devices, while the PRC-25 could not. ![]() It differs from its predecessor mainly in that the PRC-77's final power amplifier stage is made with a transistor, eliminating the only vacuum tube in the PRC-25 and the DC-DC voltage converter used to create the high plate voltage for the tube from the 15 V battery. The AN/PRC-77 entered service in 1968 during the Vietnam War as an upgrade to the earlier AN/PRC-25. ![]()
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