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2-14
Canceling the guard zone
Press and hold down the [GUARD] key
until the guard zone disappears.
Notes on the guard alarm
• When the radar range is less than one
half of the guard zone range, the guard
zone disappears from the display and
G (IN) (or G (OUT)) is displayed in
reverse video. If this happens, raise the
range to redisplay the guard zone.
• A target echo does not always mean a
landmass, reef, ships or surface objects
but can imply returns from sea surface
or precipitation. As the level of these
returns varies with environment, the
operator should properly adjust the STC,
GAIN (sensitivity), A. C RAIN and FTC
to be sure the alarm system does not
overlook target echoes.
Guard zone
to set
* G (IN)
(2) Drag cursor to
top left corner of
zone and press
[GUARD].
Asterisk blinking
Drag cursor
here.
(1) Mentally create
the guard zone to set.
G (IN)
(3) Drag cursor to
bottom right corner
of zone and press
[GUARD].
(4) Guard zone
completed.
G (IN)
Guard
zone
Drag cursor
here.
Figure 2-15 How to set a guard zone
2.17 Suppressing Radar
Interference
Radar interference may occur when near
another shipborne radar operating in the
same frequency band as your radar. Its on-
screen appearance is many bright dots
either scattered at random or in the form of
dotted lines extending from the center to
the edge of the display. Figure 2-16
illustrates interference in the form of curved
spokes. Interference effects are
distinguishable from normal echoes
because they do not appear in the same
place on successive rotations of the
antenna.
Figure 2-16 Radar interference
Four levels of interference are available,
including off. 3 provides the highest level of
rejection.
Procedure
1. Press the [MENU] key.
2. Press the omnipad at 6 o’clock to
select P/L, IR, NR & Radar Mode and
press the [ENT] key.
3. Press the omnipad at 6 o’clock to
select Int Reject.
4. Press the omnipad at 3 o’clock/9
o’clock to select level desired; 3
provides the greatest degree of
interference rejection.
5. Press [ENT] and [MENU] keys.
IR appears at the top right corner on the
display when the interference rejection
circuit is turned on.