Interference Rejector - Furuno MODEL 1622 Operator's Manual

Setting a guard zone
1. Operate the TrackDisk to place the cursor at
the top left corner of the zone and press the
[GUARD] key.
2. Operate the TrackDisk to place the cursor at
the bottom right corner of the zone and
press the [GUARD] key.
Guard
zone
to set
Mentally create
the guard zone to set.
GUARD
Guard
zone
Guard zone completed.
Figure 1-19 How to set a guard zone
3. About 10 seconds later "GUARD" replace
G(IN) or G(OUT).
Note: When the radar range is less than one
half of the guard zone range, the guard zone
disappears and the indication "UP RNG"
replaces G (IN) or G (OUT). If this happens,
raise the range to redisplay the guard zone.
10
Asterisk blinking
* GUARD
Drag cursor
here.
1) Drag cursor to
top left corner of
zone and press
[GUARD].
* GUARD
Drag cursor
here.
2) Drag cursor to
bottom right corner
of zone and press
[GUARD].
Silencing the audible alarm
When a target violates the guard zone, the
target flashes and the audible alarm sounds.
You can silence the audible alarm by pressing
the [GUARD] key. When this is done, GUARD,
displayed in reverse video, replaces G (IN) or G
(OUT) and the guard zone is displayed in
reverse video. This means the audible alarm is
temporarily deactivated. Press the key again to
reactivate the alarm.
Canceling the guard zone and guard
alarm
Press and hold down the [GUARD] key more
than two seconds to erase the guard zone.

1.21 Interference Rejector

Mutual radar interference may occur in the
vicinity of another shipborne radar operating in
the same frequency band (9 GHz). It is seen on
the screen as a number of bright spikes either in
irregular patterns or in the form of usually
curved spoke-like dotted lines extending from
the center to the edge of the picture. This type of
interference can be reduced by activating the
interference rejector circuit. "IR" appears at the
top right corner when the interference rejector
circuit is on.
1. Press the [MENU] key.
2. Select INT REJECT.
3. Select ON or OFF.
4. Press the [MENU] key.
Figure 1-20 Radar interference