Furuno 1830 - Page 11

It is rarely possible to place the Scanner Unit where a completely clear view
in all directiona can be obtained. Thus, the angular width and relative
bearing of any ahadow sectors should be determined for their influence on
the radar at the first opportunity af ter fitting. (The method of determining
shadow and blind sectors is shown later in this section.)
The Scanner Unit should be generally raounted as high as possible on the
boat to ensure best performance at the maxiraum range. But this is perhaps
not as important as might be supposed for a small boat. For example,
iricreasing the helght from io feet to 13 teet off the water won't net very
much if you are looking for another boat which also only rises 10 feet df
the water. Doing so would increase the range capahility from 7.7 nautical
miles to 8.3 nautiaal mileB, an incrcaae that may not be wurtli Ihe
servieeability problems involved in mounting the scanner higher on the boat.
In addition, if your boat is equipped with a radio direction finder, its
anlenna should not be positioned in close proximity to the Scanner Unit,
since the DF would be adversely affected. A separation of more than 2
meters is recommended.
The compass safe distance (3.1m (10.17 feet) standard oompass and 1.75m
(5.74 feet) steering compass) should be also observed. If the distance is
not enough, deviation of the magnetic compass will result.
On a sailboat, the Scanner Unit is normally mounted up on the mast. An
antenna bracket may be optionally supplied to mount it with ease. See page
10. On power boats, it Is usually installed on a framework above the flying
bridge. However, in many cases, the unit can be installed directly on the
top of the wheelhouse near the ship's centerline.
When this radar is to be installed on larger vessels, take care to consider
the folio wing points.
1) The interconnection cabie is run between the Scanner Unit and the
Display Unit. If additional interconnection cabie is required for a particular
installation, an unbroken length of cabie must be used (i.e,, no splices
allowedO, and raaxiraum length of the interconnection cabie is 30 meters.
On a sailboat where it will be necessary to step the mast for maintenance, a
junetion box may be installed at the base of the mast. under the
floorboards. The junetion box must be watertight and the wire breakout
musi be kepi as short as possible.
2) Deposits and furaes from a funnel or other exhaust vents can adversely
^ff^ot tbe performance of the antenne., since hot gases may warp the
radorae. The scanner unit must not be mounted in a position where it may
be subjected to temperatures in excesa of 70“C (158°F.)
The figure below shows typical Scanner Unit placement.
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