Furuno SC-120 - Manual (Page 15)

2-1
2 INSTALLATION
2.1 Mounting Considerations
2.1.1 SC-series antenna unit
General
• Keep the length of antenna cable in mind when selecting a mounting location.
The cable comes in lengths of 15 meters (standard supply), or 30 m or 50 m
(optional lengths).
• Select a location where vibration and shock are minimal.
Installing the antenna above superstructures
The antenna must be mounted above all other structures on the vessel to obtain
an unobstructed view of the satellites regardless of vessel heading. Failure to do
so will cause shadows and multipath reflection problems.
Mast
Radar Antenna
Bridge
SC-series Antenna
Example of proper installation
Installing the antenna below superstructures
If it is not possible to mount the
antenna above all superstructures on
the vessel, as shown in the illustration
above, shading and multipath
problems may occur on at least one
heading, and possibly more. To
possibly avoid those problems,
observe the guidelines in this section.
NOTICE
If the antenna is installed below any
superstructure, the installation must
be done over a two-day period, following
the procedure in the service manual.
At least 12 hours are required to capture
tracking data to measure multipath indexes
and locate areas of shading.