IDENTIFY FRIEND OR FOE
IFF equipment, used with search radars, permits automatic identification of targets before they are near enough to threaten the security of a friendly craft. In addition to friendly identification, IFF systems also provide other information such as type of craft ,squadron, side number, mission, and aircraft altitude.
Interrogator section. The major units of the interrogator section (except the video decoder group) are usually mounted in a rack located in the radar equipment room. The Interrogator Set, provides rf challenges for the various modes. It also receives transponder replies and processes them into proper video signals for application to the decoders and indicators .The ICC crypto, encodes NSM challenges for transmission by the interrogator. It also decodes the received NSM transponder replies. The code changer key(programmer), inserts the NSM code into the computer.