Installation Procedures
2-8
560-1049-02 Rev. B
GDL 90 Installation Manual
2.6
Antenna Installation and Connections
The GDL 90 requires three antennas (one GPS antenna and two UAT antennas). Single-UAT-antenna
installation is allowed for radio transparent airframes. Single-antenna installations may require field
approval after successful completion of an FAA-approved flight test demonstration. Garmin AT strongly
recommends two UAT antennas be used for all installations.
Follow the antenna manufacturer’s installation instructions for mounting the antennas.
Figure 2-6. Antenna Placement
2.6.1 GPS
Antenna
The mounting location and cable connections for the GPS antenna are very important. The GDL 90 GPS
antenna must have an unobstructed view of the sky during all normal aircraft maneuvering attitudes.
The GPS antenna should be mounted using the following guidelines:
•
no closer than two feet from all types of VHF transmitter antennas,
•
at least six inches away from other antennas emitting less than 25 watts, and
•
at least two feet from higher power antennas
See the GPS antenna installation manual for additional guidance.
The GPS antenna should be mounted such that it will not be shadowed by other nearby antennas or
aircraft structures above the GPS satellite mask angle of 5 degrees. The general rule of thumb is that a
nearby antenna should be shorter than 1/12
th
of its separation from the GDL 90 GPS antenna. For
example, an antenna at a distance of 6 inches from the GPS antenna should be shorter than 0.5 inches.
Special care should be taken to ensure that the GPS antenna is not mounted in close proximity to
antennas that may emit harmonic interference at the L1 frequency of 1575.42 MHz.
Refer to AC 20-138A Airworthiness Approval of Global Navigation Satellite System (GNSS) Equipment
for additional information and guidelines.
Содержание GDL 90
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