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G900X/G950 Installation and Maintenance Manual – G900X Installation Overview
Revision D
190-00719-00
1.6 Antenna
Considerations
1.6.1 Antenna
Installation
Follow the manufacturers’ instructions. Avoid running other wires and coaxial cables near the VOR/LOC
antenna cable.
CAUTION
Do not use construction grade RTV sealant or sealants containing acetic acid. These
sealants may damage the electrical connections to the antenna. Use of these type sealants
may void the antenna warranty.
1.6.2
GPS Antenna Location
Refer to Section 12 for GPS antenna location considerations.
1.6.3
COM Antenna Location
The GIA 63W COM antenna should be well removed from all projections, engines and propellers. The
ground plane surface directly below the antenna should be a flat plane over as large an area as possible
(18 inches square, minimum). The antenna should be mounted a minimum of six feet from any DME or
other COM antennas, four feet from any ADF sense antennas, and three feet from the GIA 63W and its
GPS antenna.
If simultaneous use of two COM transceivers is desired (split- COM or simulcomm), use of the TX
interlock function is mandatory. In addition, the COM antennas should be spaced for maximum isolation.
A configuration of one topside antenna and one bottom side antenna is recommended.
1.6.4
VOR/LOC Antenna Location
The GIA 63W VOR/LOC antenna should be well removed from all projections, engines and propellers.
It should have a clear line of sight if possible. The antenna must be mounted along the centerline of the
aircraft, minimizing the lateral offset.
1.6.5
Glideslope Antenna Location
The GIA 63W Glideslope antenna should be well removed from all projections, engines and propellers. It
should have a clear line of sight if possible.
1.6.6
Marker Beacon Antenna Location
The marker beacon antenna should be mounted on a flat surface on the underside of the aircraft. Mount
the antenna so that there is a minimum of structure between it and the ground radio stations. Locate it as
far away as possible from transmitter antennas.