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Installation Notes
MX GPS ANTENNA INSTALLATION
Antenna Location
The MX antennas (MX421, MX521 & MGL3) are designed for exposed
installation. They should be mounted with a relative clear view of the
horizon. Do not, mount the antenna on top of a very tall mast, as this
may degrade the COG and SOG calculations, particularly when in
DGPS mode. Ensure the antenna is placed outside the beam path of
transmitting radar (typically +15° horizontally from the array's center
point) and INMARSAT satcom (A, B, C, or M; typically +10° from the
array's center point in any of the possible transmitting directions and
at least 5 meters from any side lobe or back lobe direction). The GPS
antenna should be mounted below and at least 5 meters away from
these types of antennas. Do not place it within 3 meters of a SSB or
VHF radios or their antennas.
Antenna Options
Four antenna models can be used with the MX 500, namely:
•
MX421 D/GPS smart antenna
•
MX521 D/GPS smart antenna
•
MX525 D/GPS Sensor
•
MX575 Satellite Compass
Wiring hook-up to the MX421, MX521, and MX525 antenna models are
identical. The antenna model is indicated on the serial number tag on
the underside of the antenna. The drive voltage to the antenna is 12-32
VDC +10%, and normally provided by the MX 500.
Antenna Connector
The 10-pin connector at the bottom of the antenna housing provides the
necessary interfacing between the smart antenna and the MX 500 CDU.
Refer to the MX antenna wiring diagram shown in Appendix F - Section
4 of this manual.
Version 3.0
Installation Manual
209
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