User Manual

18
3.3 Determining Place of Installation
3.3.1 Scanner unit
A radar's target detection capacity varies greatly depending on the position of the scanner. An ideal
position is a location high above the ship's keel line where there is no obstacle all around the scanner. In
an actual ship, such an ideal location is limited by various factors.
To comply with FCC RF exposure
requirements, the radar antenna for this scanner must be installed to provide a separation distance of
80 cm or more from all persons.
Therefore, consider the following suggestions when you determine the
place to install the scanner:
(a) Install scanner at a position as high as possible.
The higher the installation position, the longer the radio ranging distance. Install the
scanner at a position as high as possible after considering the ship's hull structure and radar
maintainability.
(b) Install scanner away from smoke-stack and mast
If the scanner is installed at the same height as the smoke-stack or mast, radar waves may
be blocked, creating shadow zones or generating false echoes. Therefore, do not install the
scanner at such a position.
(c) Install scanner forward away from obstacle.
To avoid creating shadow zones or generating false echoes, install the scanner at a position
nearer to the ship's bow away from obstacles. When installing the scanner on a mast, posi-
tion it in front of the mast. (If obstacles cannot be avoided for the ship's structural reasons,
refer to "Shifting away from obstacles" described Page 13.)
(d) Do not install the scanner near hot or heat-generating items.
Do not install the scanner at a position where it may be subjected to smoke or hot air from
smokestacks or heat from lamps.
(e) Install the scanner away from antennas of other equipment.
Install the scanner as much away from the antennas of a direction finder, radio transceiver,
etc. as possible.
To eliminate the interference, install the scanner
away from the antenna of radio transceivers.
(f) Make the cable length as short as possible.
Keep the distance from the scanner to the display unit within the standard cable length
of 10 m. If you use longer cable for unavoidable reasons, limit the cable length to a maximum
of 100 m for RA53/54.
3.3.2 Display unit
The display unit can be installed on desktop, wall surface, or ceiling. Determine the place to install
the display unit that is convenient for navigation and radar operation after considering the following
suggestions:
(a) A place where you can see the ship's bow when you raise your face from the radar screen.
(b) A place where there is no direct sun-light to avoid display temperature up.
(c) A place where there is good ventilation and minimum vibration.
(d) A place where the display unit is further away than the minimum safe distance from a
magnet compass as listed in Tab.3-4 below.
Tab.3-4 Minimum Safe Distance from Magnetic Compass
Master compass Steering compass
Scanner unit 2.0m 1.4m
Display unit 2.0m 1.4m
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CAUTION