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3. VERTICAL MODE
3-13
3.9.3 Noise limiter
Weak, unwanted reflections, colored light-blue or green, appear when the water
is dirty, plankton layers exists, or due to ship’s noise. The noise limiter can
reduce the effects of these unwanted reflections. Raising the setting causes
unwanted reflections to become colors of blue to background color. Normally a
setting of 3 or 4 is sufficient.
1. Press the [MENU] key to open the menu.
2. Select the V-SCAN SETTING menu and press the [MENU] key.
3. Select NOISE LIMITER and press the [MENU] key.
4. Adjust setting from the dialog box as appropriate and press the [MENU] key.
The setting range is 0-15. The higher the setting the greater the degree of
suppression.
5. Select QUIT and press the [MENU] key.
6. Select QUIT at the top of the menu screen and press the [MENU] key to
close all menus.
3.9.4 Shifting Tx frequency
If interference cannot be suppressed by the interference, shift the Tx frequency
with FREQ SHIFT on the V-SCAN SETTING menu.
1. Press the [MENU] key to open the menu.
2. Select the V-SCAN SETTING menu and press the [MENU] key.
3. Select FREQ SHIFT and press the [MENU] key.
4. Adjust setting from the dialog box as appropriate and press the [MENU] key.
The setting range is -65 to +65.
5. Select QUIT and press the [MENU] key.
6. Select QUIT at the top of the menu screen and press the [MENU] key to
close all menus.
3.9.5 Echo average
The ECHO AVERAGE in the V-SCAN SETTING menu adjusts echo afterglow,
which can be useful for watching echo movement. The setting range is 0-7. The
higher the number the longer echoes remain on the screen.
3.9.6 Reverberation reduction
You may choose the length of reverberation for the echo signal in the V-SCAN
SETTING menu. The larger the value the shorter the reverberation, which marks
it easer to see the echo signal. The setting range is 0-3.