MIL-R-28704, MILITARY SPECIFICATION, RADIO RELAY EQUIPMENT, TRANSHORIZON (TROPOSPHERIC SCATTER) AN/TRC-97 (5 SEP 1969)

MIL-R-28704, MILITARY SPECIFICATION, RADIO RELAY EQUIPMENT, TRANSHORIZON (TROPOSPHERIC SCATTER) AN/TRC-97 (5 SEP 1969)., This specification sets forth the requirements for a tactical, multi-channel radio communication system terminal, hereinafter referred to as “the radio set”, capable of providing shore based communications by means of tropospheric scatter or line of sight propagation in the SHF band of 4.4 and 5.0 gigahertz for the transmission and reception of 12 or 24, channels of voice, 16 channels of teletype, and data communications at distances from 1 to 100 - nautical miles. The objective is to provide a radio set having a high degree of reliability, capable of being readily operated and maintained. The radio set operates from a nominal alternating current (AC) power source of 120/208 volts, 400 hertz (Hz), 3 phase, 4 wire, wye.