Installation Considerations; Com Antenna; Installation Materials; Cabling And Wiring - Garmin G3X Touch Installation Manual

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21.4 Installation Considerations

A COM Antenna that meets TSO-C37( ) and C38( ) or TSO-C169( ), 50W, vertically polarized with

coaxial cable is recommended but not provided.

To avoid damage to the GTR 20, take precautions to avoid transmitting when no

antenna is connected.

The GTR 20 is intended for use with the standard aviation accessories. The following items are

recommended for installation, but not supplied:

Wire (MIL-W-22759/16 or equivalent)

Shielded Wire (MIL-C-27500 or equivalent)

Mounting Hardware - #10 hardware recommended

Push/Pull (that can be manually reset) Circuit Breaker

Tie Wraps or Lacing Cord

Ring Terminals (for grounding)

Coaxial Cable (RG-400, RG-142B or coaxial cable with 50 Ω impedance meeting applicable

aviation regulations should be used.

Refer to the interconnect examples in

Use wire and cable meeting the applicable aviation regulation. When routing wire and cable, observe the

following precautions:

Keep as short and as direct as possible

Avoid sharp bends

Avoid routing near power sources (e.g. 400 Hz generators, trim motors, etc.) or near power for

fluorescent lighting

Do not route cable near high voltage sources

To avoid damage to the GTR 20, take precautions to prevent Electro-Static Discharge

(ESD) when handling the GTR 20, connectors, and associated wiring. ESD damage can

be prevented by touching an object that is of the same electrical potential as the GTR 20

before handling the GTR 20 itself.

The GTR 20 connects to the G3X system using the CAN bus. If communication is lost or no

GDU displays are present, the GTR 20 will automatically tune the emergency frequency

(121.500 MHz) and set the COM radio volume to a pre-determined level. See

for information on configuring the emergency volume level.

190-01115-01

for wire gauge guidance.

G3X/G3X Touch Installation Manual - GTR 20 Installation