Tecpro AD913

Simplex Radio Adapter

The AD913 allows communication between a Tecpro wired system and a simplex radio system, typically a pair or more of Walkie-talkies. It allows audio on the wired comms system to be transmitted to remote radios and replies from these remote units to be heard by parties on the wired system circuit.

AD913 Simplex Radio Adapter
  • AD913 Simplex Radio Adapter Rear

Product Description

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.


  • 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


Power requirements 24-30v DC at 15mA from comms system
External input To suit earphone/speaker levels, 10k ohms nom. balanced and floating
External Output To suit mic inputs, 200 ohm nominal source balanced and floating, open circuit in receive mode
External PTT Single pole contact, closed circuit in transmit, rated 0.25A at 28V DC
Connections Transceiver via XLR 6 pin male (Neutrik). Intercom ring (2-wire) via XLR 3 pole male and female (loop-through)
Optional Accessories AL914 is readymade cable to interface the AD913 to the Maxon SL70 series VHF/UHF handportables. AL919 interfaces to the TTI FreeQuency TX-1446 and Maxon SL55 series.
AL920 interfaces to the Multicom Junior 446MHz series.
Dimensions 107 x93 x50mm
Weight 450g
Construction Black anodised extruded case with glass filled nylon bezels for protection
Accessory Cable 'Y' lead YL917 has 6 pin XLR female to dual 3 pin XLR male