3-3
Too high Proper Too low
Figure 3-4 Examples of proper
and improper gain
5. Press ▲ to select Range.
6. Press t or s to select basic range de-
sired.
7. Press ▼ to select Shift.
Display
Shift
Figure 3-5 Shift concept
8. Press t or s to shift the basic range, if
desired.
9. Press the MENU key.
3.4 Suppressing Low LevelNoiseLight-blue dots may appear over most of
screen. This is mainly due to dirty water or
noise. This noise can be suppressed by ad-
justing CLUTTER on the VIDEO SOUNDER
SETUP menu.
When the sounder mode is Auto, the clutter
suppression setting is fixed at AUTO. To sup-
press low level noise in manual sounder op-
eration do the following:
1. Press the MENU key.
MAIN MENU
1. DISPLAY SETUP
2. TRACK/MARK SETUP
3. ERASE TRACK/MARK
4. ROUTE/ROUTE LIST
5. ALARM SETUP
6. VIDEO SOUNDER SETUP
7. MEMORY SAVE/LOAD
8. CLEAR MEMORY
0. SYSTEM MENU
: Cursor ESC: Esc
Figure 3-6 Main menu
2. Press the [6] key to display the VIDEO
SOUNDER SETUP menu.
0
40
80
120
VIDEO SOUNDER SETUP
CLUTTER 0 1 2 3
AUTO
ADVANCE STOP
NOISE LM OFF
ESC : Esc
: Cursor
2D
5:55
65 E
1/8 1/4
1/2 1/1 2/1
NL1
NL2 NL3
ON OFF
ON OFF
SL0 SL1 SL2
X2 X3
X4 X5
12345
DEP CHIME
HUE
TEMP GRP
SIG LEV
ZOOM
Figure 3-7 Video sounder setup menu
3. Press ▲ to select CLUTTER.
4. Press t or s to select clutter rejection
level desired; 0 (OFF), 1, 2, 3 or AUTO.
The higher the number the higher the de-
gree of suppression. Note that weak ech-
oes may not be displayed when the clutter
circuit is on.
5. Press the MENU key.
Clutter Clutter removed
Figure 3-8 How the clutter function works