Section 17 GPS 20A (WAAS GPS Position Source) Installation. Garmin G3X Touch for Experimental Aircraft, GDU 465, GDU 455, G3X, GDU 460, GDU 450
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17.3.2 Additional Equipment Required
Table 17-3 Contents of GPS 20A Connector Kit (011-03914-00)
Item
Backshell w/Hdw, Jackscrew, 9 Pin
CAN Termination Kit
Conn, Rcpt, D-Sub, Crimp Socket, Commercial, 09 CKT
Contact, Socket, Military Crimp, Size 20
Garmin P/N
011-01855-00
011-02887-00
330-00625-09
336-00022-02
Quantity
1
1
1
10
17.4 General Specifications
See
for power/current specifications, and Section 2.4.1
for dimension/weight specifications.
17.5 Mounting Requirements
The GPS 20A will mount remotely. The GPS 20A will be secured to the airframe using four screws supplied by the installer. Refer to
for outline and installation drawings.
17.6 Unit Installation
Fabrication of a wiring harness is required. Sound mechanical and electrical methods and practices are
recommended for installation of the GPS 20A. Refer to Section 2.3
for wiring considerations, and to
1. Mount the unit to a suitable mounting location using (4) #10-32 pan or hex head screws.
2. Assemble the connector backshells and wiring harness.
3. Connect CAN terminator to unit if required (
4. Connect backshell connectors.
17.7 Antennas
information.
17.8 Antenna Cable Requirements
Cable loss from the GPS/SBAS antenna should be between 1.5 dB and 6.5 dB in order to maintain proper rejection to interference signals.
Coaxial connectors and adapters, such as TNC to BNC, add additional loss to the cable and should be considered when computing the cable loss. A typical loss of 0.2 dB can be used for each connection.
For RG-142B or RG-400, 1.5 dB equates to a length of approximately 6.5 feet of cable with a connector on each end.
For installations that require less than 6.5 ft of cable, the cable may be coiled, taking into account the minimum bend radius of the cable.
190-01115-01
Rev. AN
G3X/G3X Touch Installation Manual - GPS 20A Installation
Page 17-3
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