API's I-Band Transponder System makes use of any I-Band surveillance radar, both for interrogation and for reception of the coded transponder replies. By transmitting any one of 16 different coded reply sequences, friendly aircraft can individually identify themselves to the controlling radar. Upon reception, the transponder reply is filtered from the radar echo and is channelled to the RRB Receiver.
With the addition of Video Code Suppression Units, the code information may be removed from a video feed while retaining the essential target enhancement. This switchable feature can reduce display clutter in high target environments.
The I-Band Transponder includes a built in test facility to prove both receive and transmit functions for operator confidence.