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190-01115-01
G3X/G3X Touch Installation Manual - GTR 20 Installation
Rev. AC
Page 21-6
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
antenna.
•
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.