Garmin GDL 82 Installation Manual

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Garmin GDL 82 Installation Manual Manual pdf 45 page image

Installation Procedures190-01810-00 GDL 82 TSO Installation ManualRev. 5 Page 6-86.4 Antenna Installation and ConnectionsThe GPS/SBAS installation instructions meet the guidance material contained in AC 20-138D, Airworthiness Approvalof Global Navigation Satellite System (GNSS) Equipment.6.4.1 GPS AntennaThis section provides information on the GPS/SBAS antenna installation. Refer to section 4.5.2 for installation locationconsiderations. Refer to GA 35, GA 36, GA 37 Antenna Installation Instructions for additional installation information.Temporarily locate the GPS/SBAS antenna with coax connected to the GDL 82 unit and check the GPS/SBASperformance as described in section 8.1.1. Once a suitable location has been verified, then permanently mount theantenna.For RG-142B or RG-400 coaxial cable, 1.5 dB equates to a length of approximately 6.5 feet of cable with a connectoron each end. RG-142B or RG-400 cable can be used for lengths less than 35 feet. For longer lengths, use low-lossdouble or triple shielded 50 ohm coax cable.For mounting the antenna, follow the antenna manufacturer’s installation instructions. Ensure that the GPS/SBASantenna is electrically bonded to the aircraft. The GPS/SBAS antenna requires a minimum ground plane radius of7.5 inches around the perimeter of the antenna.7.5 IN. MINIMUMGPS ANTENNAGROUND PLANEFigure 6-4 GPS Antenna Ground Plane