Furuno 1830 User Manual

APPLICATION
As an airi to navigation, radar can ba a very vaJuablo tool- No other
navigation aid can give you the ability to spot vessels coming at you in ttie
fog, or tell you the location of the inlet to the harbor in the pitch black of
night. To help you understand better what your radar can and cannot do
tor you this section covers the characteristics and limitations of radar,
picture interpretation, position fixing with radar and aids to navigation.
FACTORS AFFECTING MINIMUM RANGE
Targets disappearing from the screen when at close ranges can be
dangerous. For this reason, detection of targets at short ranges is very
important. Minimum range is determined primartly by transmitter
pulselength. The • shorter the transmission time, the sooner the return
echoes can bc rcccived and their distance measured. This radar
automatically determines the pulselength for both short and long ranges, for
optimal detection of targets at short as well as long range-
Sea Return
Sea dutter echoes received from waves may hamper detection of targets
beyond the minimum range set by the pulselength and recovery time. CKe-
covery time is the time required for the receiver to recover to half
sensitivity after the end of a transmitted pulse, so it can receive a return
eehQ.) Proper adjnatment of the A/C SKA oontrol iray alleviate some of the
problem.
Ver tical Beamwjdth
The ability to see targets very close to the boat is decreased if the antenna
is mounted too high off the water, since the bottom of the vertical beam of
the scanner cuts off nearby targets, Fjg.37 illustratcs the cffectc of a
scanner mounted too high off the water.
Fig.37 Effeets of a Scanner Mounted too High off the V/ater
FACTORS AFFECTING MAXIMUM RANGE
It is nearly impossible to State that a radar has a maximum range. The max-
imum range a radar will "see" is dependent on many factors, not just the
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Furuno 1830 Specifications

General

Brand	Furuno
Model	1830
Category	Marine Radar
Language	English