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4. VIDEO SOUNDER OPERATION
4-11
4. Adjust the Trackball upward or downward to select clutter rejection level desired; 0
(OFF) through 16. The higher the number the higher the degree of suppression. Note
that the clutter suppressor may erase weak echoes. Therefore, turn off the clutter when
its use is not required.
5. Press the RETURN soft key followed by the MENU key to close the menu.
Note: Unlike the signal level feature, clutter does not reduce display colors. However, if you
do not wish to change the relation between weak and strong echoes, use signal level
instead.
4.7 Erasing Weak Echoes
Sediments in the water or reflections from plankton may be painted on the display in green
or light blue. These weak echoes may be erased as below.
Weak
echoes
Appearance of weak echoes
1. Press the MENU key.
2. Press the SOUNDER MENU soft key.
3. Select SIGNAL LEVEL, and press the EDIT soft key to show the signal level window.
SIGNAL LEVEL
OFF
SL1
SL2
SL3
SL4
SL5
SL6
SIGNAL LEVEL
OFF
SL1
SL2
SL3
16-color display
8-color display
Signal level window
4. Use the Trackball to select level of erasure or OFF as appropriate. The higher the
number the stronger the echo that will be erased.
5. Press the RETURN soft key followed by the MENU key to close the menu.
Note: Unlike “clutter,” signal level reduces display colors. Therefore, if you do not wish to
reduce colors, use clutter instead.
132


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