Suppressing Radar Interference; Selecting Pulsewidth - Furuno FR-7062 Operator's Manual

3.3 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 3-4 il-
lustrates interference in the from of curved
spokes. Interference effects are distinguishable
form normal echoes because they do not ap-
pear in the same place on successive rotations
of the antenna.
Figure 3-4 Radar interference
Four levels of interference are available, includ-
ing off; IR1, IR2, IR3 and OFF. IR3 provides
the highest level of rejection.
1. Press the [MENU] key.
2. Select "INT REJECT" and press the [ACQ/
ENTER] key.
3. Select level desired by pressing the [ACQ/
ENTER] key.
4. Press the [MENU] key to close the menu.
IR and level selected appears at the bottom right
corner on the display when the interference re-
jection circuit is turned on.
3-2

3.4 Selecting Pulsewidth

Pulsewidth is the transmission time of a single
radar pulse. The longer the pulsewidth the
greater the direction range capability, however
range accuracy and range resolution are re-
duced.
Pulsewidth can be selected to short or long on
the 1.5 and 3 nautical mile ranges.
1. Press the [MENU] key.
2. Select "OTHER MENU" and press the
[ACQ/ENTER] key.
[ OTHERS ]
Select item by T-ball
and press ENTER key.
1 . Panel Dimmer 1
2 . Mark Brill 1
3 . HD Mark 1
4 . Characters 1
5 . Trail Tone Single
6 . Pulselength Short
7 . Noise Reject Off
8 . Trail Time 15sec
3min 6min
9 . Tune Auto
10. WPT Mark Off
11. EBL Ref Rel
†
12. VRM Unit nm
13. Watchman Off
14. STBY Disp Norm
15. Guard Mode In
16. Own Position L/L
17. Cursor Posi R/B
18. Alm Sense LV Low
19. Dead Sector Off
20. Range
1/8
2 4
3 6
21. 2nd Rej Off
22. Self Test
23. Installation Setup
†: Not displayed on N-type radar; VRM unit is fixed for nm.
*Max. range is;
FR-7062: 64
FR-7112: 72
FR-7252: 96
Figure 3-5 OTHER MENU
3. Select "6. Pulselength" by operating the
trackball.
4. Select Short or Long by operating the
trackball.
5. Press the [ACQ/ENTER] key.
6. Press the [MENU] key to close the menu.
TX
2 3 4
2 3 4
2 3 4
2 3 4
Multi
Long
On
30sec 1min
15min 30min Cont
Manual
On
True
km sm
5min 10min 20min 20min
Econo Nav
Out
TD
L/L
Med Hig
On
1/4 1/2 3/4 1
1.5
* *
8 16
12 24 36 48 64 72 96
On
*