Page 2-2
500 SERIES INSTALLATION MANUAL
Rev Q
190-00181-02
2.2.6 ANTENNA
LIMITATIONS
Garmin’s GA 56 Antennas are recommended for installations where the airspeed of the aircraft is subsonic.
In such installations, GA 56—Mod 1 or later—must be used. See the COM, VOR/LOC, and Glideslope
antenna specifications for their limitations.
2.2.7 VHF COM 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 500 Series COM
does not interfere with its own GPS section. However, placement of the GA 56 GPS antenna relative to a
COM transceiver and COM antenna (including the GNS 530 COM antenna), ELT antenna, and DF
receiver antenna is critical.
Use the following guidelines, in addition to others in this document, when locating the 500 Series unit and
its antennas.
x
GPS Antenna—Locate as far as possible from all COM antennas and all COM transceivers
(including the 500 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.
x
Locate the 500 Series unit as far as possible from all COM antennas.
Figure 2-1. GPS Antenna Installation Considerations
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
GNS 530 transmitter.
If a COM is found to be radiating, the following can be done:
1. Replace or clean VHF COM rack connector to ensure good coax ground.
2. Place a grounding brace between the 500 Series unit, VHF COM and ground.
3. Shield the VHF COM wiring harness.
2.2.8 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.
Summary of Contents for GNS 530
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