Interference Of Gps - Garmin G3X Touch Installation Manual

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21.5.2 Interference of GPS

On some installations, VHF COM transceivers, Emergency Locator Transmitter (ELT) antennas, and

Direction Finder (DF) receiver antennas can re-radiate to the GPS antenna. Placement of the GPS antenna

relative to a COM transceiver and COM antenna (including the GTR/ COM antenna), ELT antenna, and

DF receiver antenna is critical.

Use the following guidelines, in addition to others in this document, when locating the GTR 20 and its

Locate the GTR 20 as far as possible from all GPS antennas.

Locate the COM antenna as far as possible from all GPS antennas.

If a COM is found to be radiating, the following can be done:

Replace or clean VHF COM rack connector to ensure good coax ground.

Place a grounding brace between the GTR 20 and ground.

Shield the GTR 20 wiring harness.

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G3X/G3X Touch Installation Manual - GTR 20 Installation