The Transmitting Set, Radar Data AN/AKT-18B (data transmitting set) is an airborne system which accumulates radar video data and navigational data, encodes the data into a serial digital bit stream, and transmits it to Receiving Set, Radar Data AN/TKQ-2B (data receiving set). Video and navigational information to be transmitted is derived from Radar Surveillance Set AN/APS-94F (radar set). The radar set and data transmitting and receiving sets are components of Radar Surveillance System AN/UPD-7 (system). This system permits fixed target and moving target radar imagery from the airborne radar set to be recorded in real time by ground receiving sets for immediate use by field commanders. The direct support test equipment shall be used in maintenance of the system. The control head controls airborne portion of the data link. The digital encoder receives the FT and MT data and compresses and encodes the data into suitable form for modulation of the FM/FSK transmitter which is contained in the airborne AN/ARC-164(V)16 Radio Set. The radio set transmits FM-FSK data on any one of 7000 channels in the 225 to 399.975 MHz RF spectrum. The operating frequency is selected by the remotely located radio set control. The airborne radio set transmits a continuous FSK signal with 30 watts RF output. The transmitter transmits the data over a UHF link to the ground station where it is received by the receiver of the ground station AN/ARC-164(V)16 Radio Set. A serial digital stream of data is then coupled to the decoder where the data is decoded into discrete digital data words. These words are further processed into either digital or analog signals suitable to drive the RO-495 Recorder-Processor Viewer.