Section 22 Gps/Xm Antenna Installation; Non-Garmin Antennas - Garmin G3X Touch Installation Manual

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22 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 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

Section 33.4.15

further information.

The GPS 20A can only be used with GA 35, GA 36, or GA 37 antennas.

GA 35, GA 36 and GA 37 antennas cannot be used with GDU 37X/4XX units.

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.

Table 22-1 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 ensure

that their choice of antenna meets FAA standards according to the specific installation.

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.

Screw Mount,

Screw Mount,

only Antenna

*The GPS antenna connector is TNC type. The VHF COM antenna connector is BNC type.

190-01115-01

(for GDU 37X systems) or

Table 22-1 Supported Non-Garmin Antennas

G3X/G3X Touch Installation Manual - GPS/XM Antenna Installation

Section 34.4.21

(for GDU 4XX systems) for

Antenna Part

Garmin Order

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