Garmin 320 Installation Manual page 9

This section provides the necessary information for installing the GTX 320/320A Transponders, and where
required, optional accessories. Installation of the GTX 320/320A will differ according to equipment location and
other factors. Cabling will be fabricated by the installing agency to fit these various requirements. This section
contains interconnect diagrams, mounting dimensions, and information pertaining to installation. Each
installation shall be accomplished to meet the requirements of FAA AC 43.13-2A.
Carefully unpack the equipment and make a visual inspection of the unit for evidence of damage incurred during
shipment. If the unit is damaged, notify the carrier and file a claim. To justify a claim, save the original shipping
container and all packing materials. Do not return the unit to GARMIN until the carrier has authorized the claim.
Retain the original shipping containers for storage. If the original containers are not available, a separate
cardboard container should be prepared that is large enough to accommodate sufficient packing material to
prevent movement.
A. The antenna (GARMIN P/N 010-10160-00) should be well removed from any major protrusions, the
engine(s), propeller(s), and antenna masts. It should also be as far removed as practical from
landing gear doors, access doors, or other openings that could alter its radiation pattern.
B. The antenna should be mounted on the underside of the aircraft and in a vertical position when the
aircraft is in level flight.
C. Avoid mounting the antenna within three feet of the ADF sense antenna or any other
communication antenna and six feet from the DME antenna.
D. To prevent RF interference, the antenna must be physically mounted a minimum distance of three
feet from the GTX 320/320A.
If the antenna is being installed on a composite aircraft, ground planes must sometimes be added.
Conductive wire mesh, radials, or thin aluminum sheets embedded in the composite material provide
the proper ground plane allowing the antenna pattern (gain) to be maximized for optimum
transponder performance.
Install the antenna according to the antenna manufacturer's instructions and FAA AC 43.13-2A.
GTX 320/320A Installation Manual
190-00133-01
NOTE
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Rev L