Furuno 1945 Marine RADAR User Manual


 
1-9
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