Pro Intercom AD913 Transceiver Adapter for Simplex Wireless Connection to IntercomTransceiver Adapter for Simplex Wireless Connection to Intercom Performance: The AD913 permits communications between a cabled intercom system and any number of standard, simplex, (press to talk) transceivers. One of your transceivers is dedicated as base, and connected via its accessory mic spkr jacks to the AD913. Transmissions from other transceivers (on the same frequency) are then heard at all intercom stations on the same circuit as the AD913.