System Specification and Functionality190-01810-00 GDL 82 TSO Installation ManualRev. 5 Page 2-12 System Specification and Functionality2.1 System Functionality ...................................................................................................................................... 2-12.1.1 Anonymous Mode................................................................................................................................... 2-12.2 Unit Specifications ......................................................................................................................................... 2-22.3 System Interface ............................................................................................................................................ 2-52.1 System FunctionalityThe GDL 82 is a remote-mounted unit that contains a 978 MHz transmitter, a 1090 MHz receiver, and a 1030 MHztransmitter. This unit transmits ownship Automatic Dependent Surveillance-Broadcast (ADS-B) data through the UATdata link. It interrogates connected transponders for Mode 3/A squawk code, IDENT status, and pressure altitude. TheGDL 82 with GPS/SBAS includes an internal GPS/SBAS receiver. This receiver allows the unit to function as its ownposition source for the ADS-B Out message, when an approved position source interface is not installed. Operation ofthe GDL 82 with internal GPS/SBAS receiver depends on the performance of the GPS/SBAS antenna.The GDL 82 Series consists of the following variations: GDL 82 GDL 82 with GPS/SBAS2.1.1 Anonymous ModeIn anonymous mode, the GDL 82 transmits a temporary address instead of the aircraft’s assigned ICAO address code,and a temporary Flight ID.