GNS 400W Series Installation Manual
Page 2-7
190-00356-08
Rev. G
2.4.3
VOR/LOC Antenna Location
The GNS 430W VOR/LOC antenna should be well removed from all projections, engines and propellers.
It should have a clear line of sight if possible. The antenna must be mounted along the centerline of the
aircraft, minimizing the lateral offset.
2.4.4
Glideslope Antenna Location
The GNS 430W Glideslope antenna should be well removed from all projections, engines and propellers.
It should have a clear line of sight if possible.
2.4.5
Electrical Bonding
No special precautions need to be taken to provide a bonding path between the GPS antenna and the
aircraft structure. Follow the manufacturers‘ instructions for the COM, VOR/LOC and Glideslope
antennas.
2.4.6
Interference of GPS
On some installations, VHF COM transceivers, Emergency Locator Transmitter (ELT) antennas, and
Direction Finder (DF) receiver antennas can re-radiate through the GPS antenna. The 400W Series COM
does not interfere with its own GPS section. However, placement of the GPS antenna relative to a COM
transceiver and COM antenna (including the GNC 420W or GNS 430W COM antenna), ELT antenna,
and DF receiver antenna is critical.
Use the following guidelines, in addition to others in this document, when locating the 400W Series unit
and its antennas.
GPS Antenna—Locate as far as possible from all COM antennas and all COM transceivers
(including the 400W Series COM), ELT antennas, and DF receiver 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 400W Series unit 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 GNC 420W and GNS 430W transmitters.
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 400W Series unit, VHF COM and a good ground.
3.
Shield the VHF COM wiring harness.
2.4.7
COM, VOR/LOC, and Glideslope Antenna Installation Instructions
Install the COM, VOR/LOC, and Glideslope antennas according to the manufacturer‘s recommendations.
Avoid running other wires and coaxial cables near the VOR/LOC antenna cable.
Содержание GPS 400W
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