Installation Planning and Considerations190-01810-00 GDL 82 TSO Installation ManualRev. 5 Page 4-14 Installation Planning and Considerations4.1 Installation Requirements............................................................................................................................... 4-14.2 Pre-Installation Transponder Check ................................................................................................................ 4-24.3 GDL 82 External Sensors and Devices............................................................................................................. 4-34.4 Antenna Requirements .................................................................................................................................. 4-44.4.1 L-Band Antenna ...................................................................................................................................... 4-44.4.2 GPS Antenna........................................................................................................................................... 4-54.5 Antenna Considerations ................................................................................................................................ 4-64.5.1 L-Band .................................................................................................................................................... 4-64.5.2 GPS (GDL 82 with GPS/SBAS Only) .......................................................................................................... 4-74.6 Interference Considerations ........................................................................................................................... 4-9This section provides GDL 82 considerations and requirements for selecting the proper installation locations, supportingstructure, electrical wiring, and antenna mounting.4.1 Installation RequirementsThe GDL 82 requires the following minimum installation. GDL 82 L-Band antenna GPS/SBAS position source Transponder (pressure altitude, squawk code, and Ident Status source)