1. MOUNTING
1.1Mounting Methods for Scanner Unit
•The scanner unit is generally installed ei- ther on top of the wheelhouse or on the radar mast on a suitable platform. Locate the scanner unit where there is a good all- round view. Any obstruction will cause shadow and blind sectors. A mast for in- stance, 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 hori- zontal plane as the scanner unit would be a much more serious obstruction; you would need to place the scanner unit well above or below it.
•It is rarely possible to place the scanner 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 in- fluence on the radar at the first opportu- nity after fitting.
•If you have a radio direction finder on your boat, locate its antenna clear of the scan- ner unit to prevent interference to the di- rection finder. A separation of more than two meters is recommended.
•To lessen the chance of picking up elec- trical 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 placed too close to the scanner unit. Ob- serve the following compass safe dis- tances to prevent deviation of a magnetic compass: Standard compass, 1.00 m, Steering compass, 0.75 m.
•Do not paint the radiator aperture, to en- sure proper emission of the radar waves.
•When this radar is to be installed on larger vessels, consider the following points:
•The signal cable run between the scan- ner and the display comes in lengths of 10 m (standard), 15 m, 20 m and 30 m. Whatever length is used it must be unbroken; namely, no splicing allowed.
•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 scanner unit must not be mounted where the temperature is more than 70 C.
As shown in the figure below, the scanner unit may be installed on the bridge, on a com- mon mast or on the radar mast.
(a) On bridgh | (b) Common mast |
(c) Radar mast
Figure 1-1 Scanner unit mounting methods
1.2Fixing Holes in Mounting Platform
Referring to the outline drawing on page D- 1, drill five holes in the mounting platform: four holes of 15 mm diameter for fixing the scanner unit and one hole of
