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1.3 Antenna Unit for MODEL1935/1945
How to select the location for the antenna unit
• The antenna unit is installed either on top of the wheelhouse or a platform on the radar mast.
Install the antenna unit where there is a good complete view. Any obstruction causes blind sec-
tors. For example, a mast with a diameter smaller than the horizontal beamwidth of the radiator
causes only a small blind sector. A horizontal spreader or crosstrees in the same horizontal
plane creates a large obstruction. Install the antenna unit above, or below a horizontal spreader
or crosstrees.
• You cannot put the antenna unit where there is a completely clear view in all directions. Make
sure you check for blind sectors on the radar screen after you have installed the radar.
• To reduce the electrical interference, do not run the signal cable near other electrical equip-
ment. Also do not run the cable in parallel to power cables.
• A magnetic compass gives error if the antenna unit is installed near the magnetic compass.
Follow the compass safe distances shown in the SAFETY INSTRUCTIONS to prevent the
interference to a magnetic compass.
• Do not apply paint to the radiator aperture. The radar wave cannot be transmitted if there is
paint on the radiator.
• If this radar is installed on a large vessel, follow the points shown below:
• The length of the signal cable between the antenna unit and the display unit is max
. 30 m.
• The output from
a funnel or exhaust vent decreases aerial performance and hot gases can
damage the radiator. The
antenna unit must not be installed where the temperature is more
than 55° C.
• The antenna unit can be installed on the bridge, a common mast, or the radar mast.
(a) On bridge
(c) Radar mast
(b) Common mast