C-Band UAV Data Link is digital LOS datalink communication system specifically designed for Unmanned Aerial Vehicle (UAV) that transmit UAV control and high data-rate real time video data with high TRANSEC/COMSEC capabilities. The system has two main parts as Air Data Terminal (ADT) and Ground Data Terminal (GDT), using SDR technology and provides full-duplex wideband, reliable digital data link and high data-rate communication in the Uplink (for the command to UAV) and Downlink (real-time video, sensor information and other related data from UAV to ground station). With SWAP design, the system is targeted to small and medium UAVs.