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190-01115-01
G3X/G3X Touch Installation Manual - GPS 20A Installation
Rev. AC
Page 16-3
16.3.2 Additional Equipment Required
The connector kit in Table 16-3 is required to install the unit, it is not provided with the GPS 20A unit.
16.4 General Specifications
See
for power/current specifications, and
for dimension/weight specifications.
16.5 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.
16.6 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
for wiring considerations, and to
for pinouts.
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.
16.7 Antennas
The GPS 20A requires the installation and use of a GA 35, GA 36, GA 37, or equivalent GPS/WAAS
antenna. Refer to
for antenna information.
16.8 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.
Table 16-3 Contents of GPS 20A Connector Kit (011-03914-00)
Item
Garmin P/N
Quantity
Backshell w/Hdw, Jackscrew, 9 Pin
011-01855-00
1
CAN Termination Kit
011-02887-00
1
Conn, Rcpt, D-Sub, Crimp Socket, Commercial, 09 CKT
330-00625-09
1
Contact, Socket, Military Crimp, Size 20
336-00022-02
10