The control head contains the transceiver controls available to the operator, their circuitry, and receptacles for the microphone cable plug, the speaker cable plug, and the transceiver control cable plugs. The microphone cable assembly is a flexible multiconductor terminated by a cable plug at one end and having exposed leads for connecting a microphone and a push-to-talk switch at the other end. The requirements presented here cover configuration, user information, test sequence, and mechanical durability. In addition, they deal with vibration stability, temperature stability, humidity stability, conductor resistance, insulation resistance, and interconductor capacitance. Test equipment includes environmental chamber, test receptacles, megohmeter, capacitance bridge, and voltmeter. The test methods are for tests of mechanical durability, vibration, temperature, humidity, conductor resistance, insulation resistance, and interconductor capacitance. Diagrams and 11 references are included.