The unit provides a mic level output for connection to a transmitter and has an earphone level input to accept a receiver. In addition it has arrangements to provide a push-to-talk (P.T.T.) or 'transmit on' switching signal, operated by the 'signal' lamp of outstations on the wired circuit to which the AD913 is connected. Any outstation can activate a radio transmission by depressing the 'signal' lamp switch. The system signal lamps on other outstations will light in the normal way and the speech on the wired circuit will be sent to the transmitter and the necessary 'transmit on' switching will be activated. All stations will hear incoming calls when the 'signal' lamp is off.

Features

• Allows combined wired / radio systems to be assembled
• Interfaces with most good simplex radio transeivers
• Audio connections transformer balanced to reduce hum and interference
• Multi-turn presets for easy adjustment
• Robust extruded case - virtually indestructible
• Industry standard XLR type connectors