Onwa Marine Electronics KR-12X8 - Manual (Page 51)

6. INSTALLATION
This chapter provides the procedures necessary for installation.
Installation mainly consists of the following:
sitting and mounting the display unit and antenna unit
connection of the signal cable and the power cable
establishing the ground
checking the installation, and
adjustments.
6.1 Antenna Unit Installation Sitting, handling considerations
The antenna unit is generally installed either on top of the wheelhouse or on
the radar mast on a suitable platform. Locate the antenna unit where there is
a good all-round view rigging intercepting the scanning beam. Any obstruction
will cause shadow and blind sectors. A mast for instance, with a diameter
considerably less than the width of the radiator, will cause only a small blind
sector, but a horizontal spreader or crosstrees in the same horizontal plane as
the antenna unit would be a much more serious obstruction; you would need
It is rarely possible to place the antenna unit where a completely clear view
in all direction is available. Thus, you should determine the angular width
and relative bearing of any shadow sectors for their influence on the radar at
the first opportunity after fitting. (The method of determining blind and
If you have a radio direction finder on your boat, local its antenna clear of
the antenna unit, to prevent interference to the direction finder. A separation
To lessen the chance of picking up electrical interference, avoid where
possible routing the signal cable near other onboard electrical equipment
The compass safe distance should be observed to prevent deviation of the
to place the antenna unit well above or below it.
shadow sectors appears later in this chapter.)
of more than two meters is recommended.
Also avoid running the cable in parallel with power cables.
magnetic compass.
Model Standard compass Steering compass
KR-1238/1538 1.3m 0.7m
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