Furuno 1823C Mounting of Antenna Unit for MODEL1933C/1943C/1953C, Mounting considerations, 1-11

1.3Mounting of Antenna Unit for MODEL1933C/1943C/1953C

1.3.1Mounting 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. 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 to place the antenna unit well above or below it.

•It is rarely possible to place the antenna unit where a completely clear view in all directions 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.

•If you have a radio direction finder on your boat, keep the antenna unit from its antenna more than two meters to prevent the interference to the direction finder.

•To lessen the chance of picking up electrical interference, avoid where possible routing the signal cable near other onboard electrical equipment. Also avoid running the cable in parallel with power cables.

•A magnetic compass will be affected if the antenna unit is placed too close to the magnet compass. Observe the following compass safe distances to prevent deviation of a magnetic compass: Standard compass, 1.00 m, Steering compass, 0.80 m (1953C: 0.75 m).

•Do not paint the radiator aperture, to ensure proper emission of the radar waves.

a)When this radar is to be installed on larger vessels, consider the following points:

The signal cable run between the antenna and the display comes in lengths of 10 m, 15 m, 20 m and 30 m. Whatever length is used it must be unbroken; namely, no splicing allowed.

b)Deposits and fumes from a funnel or other exhaust vent can adversely affect the aerial performance and hot gases may distort the radiator portion. The antenna unit must not be mounted where the temperature is more than 70°C.

As shown in the figure below, the antenna unit may be installed on the bridge, on a common mast or on the radar mast.

(a) On bridge (b) Common mast (c) Radar mast

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