MX GPS Antenna Installation
Antenna Location
The MX antennas (MX421, MX521 & MXB5) 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 anten-
nas.
Antenna Options
Four antenna models can be used with the MX500, name-
ly:
MX421 D/GPS smart antenna •
MX521A D/GPS smart antenna •
MX525A D/GPS Sensor •
MX575A Satellite Compass •
Wiring hook-up to the MX421, MX521A, and MX525A
antenna models are identical. The antenna model is in-
dicated 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 MX500.
Antenna Connector
The 10-pin connector at the bottom of the antenna
housing provides the necessary interfacing between the
smart antenna and the MX500 CDU. Refer to the MX
antenna wiring diagram shown in pages 163, 166 or 167
of this manual.
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