Garmin G3X - 15.3.2 Additional Equipment Required; 15.4 General Specifications; 15.5 Mounting Requirements; 15.6 Unit Installation

190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 15-3
15.3.2 Additional Equipment Required
The connector kit in Table 15-3 is required to install the unit, it is not provided with the GPS 20A unit.
15.4 General Specifications
See Section 2.2 for power/current specifications, and Section 2.4.1 for dimension/weight specifications.
15.5 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 Section 15.9
for outline and installation drawings.
15.6 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
Section 23.12
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 (Section 2.3.1.3.3
).
4. Connect backshell connectors.
15.7 Antennas
The GPS 20A requires the installation and use of a GA 35, GA 36, GA 37. Refer to Section 20 for antenna
information.
15.8 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 15-3 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