The Receiver/Transmitter (R/T) Radio is a CIT/IFF system that is composed of the following: Interrogator Transponder (IT), Fuselage-Mounted Antenna Array (FMA), Beam Forming Network (BFN), and associated contractor furnished equipment (CFE) interconnect cabling. The IT can generate interrogations and process transponder replies in IFF modes 1, 2, 3/A, C, and 4. The FMA is used to support interrogator function and is composed of five identical blades and an antenna position control. The BFN accepts commands from the IT and routes radio frequencies to the five antenna outputs.
The KIV-6 performs Mode 4 encryption and decryption functions
contained in the CIT/IFF. The encryption/decryption keys are
electronically loaded through a connector located on the front panel, at
connector J1 which accepts the AN/CYZ-10 DTD, operating in the DS-102
mode. Fault detection/isolation of a failed KIV-6 is determined by the
CIT’s Built-In Test (BIT). The KIV-6 ensures secure Mode 4
transponder/interrogator performance, as it applies to the AN/APX-111
for the F/A-18, or the AN/APX-113 IFF system for the F-16, and the
helicopters.