GIA 63/GIA 63W Installation Manual Page 2-9
190-00303-05 Revision S
2.2.7 VHF COM/GPS Interference
On some installation VHF COM transceivers, Emergency Locator Transmitter (ELT) antennas, and
Direction Finder (DF) receiver antennas can re-radiate through the GPS antenna. The GIA 63(W) COM
does not interfere with its own GPS section. However, placement of the GA 56 GPS antenna (or other
comparable antenna) relative to a COM transceiver and COM antenna (including the GIA 63(W) COM
antenna), ELT antenna, and DF receiver antenna is critical.
Use the following guidelines, in addition to others in this document, when locating the GIA 63(W) and its
antennas.
• GPS Antenna—Locate as far as possible from all COM antennas and all COM transceivers
(including the GIA 63(W) COM), ELT antennas, and DF antennas. The GPS antenna is less
susceptible to harmonic interference if a 1.57542 GHz notch filter is installed on the COM
transceiver antenna output.
• Locate the GIA 63(W) as far as possible from all COM antennas.
If a COM antenna is found to be the problem, a 1.57542 GHz notch filter (Garmin P/N 330-00067-00)
may be installed in the VHF COM coax, as close to the COM as possible. This filter is not required for
the GIA 63(W) transmitter.
If a COM is found to be radiating, the following can be done:
1. Replace or clean the VHF COM rack connector to ensure good coax ground.
2. Place grounding straps between the GIA 63(W) unit, VHF COM and a good ground.
3. Shield the VHF COM wiring harness.
2.3 Rack Considerations
A location away from heating vents or other sources of heat generation is optimal. The GIA 63(W) can
be mounted using the G1000 system rack. The unit may be mounted remotely if desired.
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