190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 20-1
20 GPS/XM ANTENNA INSTALLATION
This section contains general information as well as installation information for GPS, GPS/WAAS, and
XM antennas. Use this section to mount the antenna(s).
In an installation with multiple GDU™ 37X/4XX display units, each GDU can be configured to use its
own internal GPS receiver, or to receive GPS data transmitted by another GDU. A minimum of one GPS
antenna is required for installations using more than one GDU 37X/4XX unit, as the GDU will “share” the
GPS information with all GDU units. Additional GPS antennas may be used for redundancy, but are not
required. See Appendix H.4.15
(for GDU 37X systems) or Section 30.4.24 (for GDU 4XX systems) for
further information.
NOTE
The GPS 20A can only be used with GA 35, GA 36, or GA 37 antennas.
NOTE
GA 35, GA 36 and GA 37 antennas cannot be used with GDU 37X/4XX units.
NOTE
When a GPS 20A (and connected GPS/WAAS antenna) is installed, it can be used as the
sole GPS for the system, however it is recommended to install a GPS antenna on at least
one of the GDU 37X/4XX units for redundancy.
20.1 Non-Garmin Materials Required
BNC/TNC Coaxial Connectors - May be required to terminate the antenna cable, depending upon which
antenna is used. Check the antenna installation instructions for detailed information. Example below:
• Connector, BNC/TNC Coaxial, male, crimp (MIL-PRF-39012)
Coaxial Cable, 50Ω - MIL-DTL-17 (i.e. RG-400)
20.2 Non-Garmin Antennas
Table 20-1 lists non-Garmin antennas currently supported by the GDU 37X/4XX. For non-Garmin
antennas, follow the manufacturer’s installation instructions. It is the installer’s responsibility to make sure
the chosen antenna meets FAA standards according to the specific installation.
NOTE
The GPS antenna should provide a gain of 16 to 25 dB. The GDU 37X/4XX supplies
power to the antenna at 4.5 V–5V with a maximum current of 50 mA.
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