Garmin G900X Installation And Maintenance Manual

Also see for G900X: Pilot's guide Pilot's guide

Contents

Garmin G900X Installation And Maintenance Manual Manual pdf 39 page image

G900X/G950 Installation and Maintenance Manual – G900X/G950 Installation Overview Page 1-31190-00719-00 Revision D1.6.9 VHF COM/GPS InterferenceOn some installation VHF COM transceivers, Emergency Locator Transmitter (ELT) antennas, andDirection Finder (DF) receiver antennas can re-radiate through the GPS antenna. The GIA 63(W) COMdoes not interfere with its own GPS section. However, placement of the GPS antenna relative to a COMtransceiver and COM antenna (including the GIA 63W COM antenna), ELT antenna, and DF receiverantenna is critical.Use the following guidelines, in addition to others in this document, when locating the GIA 63W and itsantennas.• GPS Antenna—Locate as far as possible from all COM antennas and all COM transceivers(including the GIA 63W COM), ELT antennas, and DF antennas. The GPS antenna is lesssusceptible to harmonic interference if a 1.57542 GHz notch filter is installed on the COMtransceiver antenna output.• Locate the GIA 63W 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 forthe 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.1.7 Instructions for Continued AirworthinessInstructions for Continued Airworthiness (ICA) for each individual LRU of the G900X/G950 system arecontained in the associated LRU section of this document. It should be noted that these instructions areapplicable for each individual LRU but are not intended as an aircraft level ICA requirement.