Test rig for radio selector unit ERSU 72d/1 & ERSU 74a/1/1

This Test Rig is designed to test Radio Selector units ERSU 72D & ERSU 74 A, which are part of Jaguar Aircraft Communications Control System. These units provide amplification of microphone and receiver signals, selection of Intercom or Transmit function and is designed for use with a microphone of 300 W impedence