3) Performs field and limited sustainment maintenance to include installation, routine maintenance, repair, and overhaul of fixed and mobile operational communication and electronics systems, e.g., shelter mounted AM radio and teletype systems, shelter mounted single side band radio and teletype systems, shelter mounted radio relay and terminal systems, other moderately complex systems, peripheral equipment, and related test equipment, and Modification Table Of Equipment (MTOE) authorized automation equipment. (4) Uses various types of test equipment to include systems test sets and stands such as AN/GRM-122s, frequency meters, standing wave indicators, oscillators, ohmmeters, voltmeters, resistance bridges, and signal generators to localize trouble by component unit, by circuit within a component, and by element of a circuit.