Furuno 1932 MARK-2 - Manual (Page 8)

1-1
1. MOUNTING
1.1 Mounting 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
1.2 Fixing 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 25-30 mm di-
ameter for the signal cable.