Furuno FSV-30, Руководство оператора

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3. VERTICAL MODE
3-12
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 to conclude.
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 -30 to +30.
5. Select QUIT and press the [MENU] key to conclude.
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 0-5.
3.9.7 Suppressing gain of bottom echo
None-moving echoes such as bottom echo, plankton echo, etc., may be
suppressed by the setting of BOTTOM SUPPRESS in the V-SCAN SETTING
menu (moving echoes such as fish school are not effected by this setting). The
setting range is 0 to 10. The greater the setting, the greater the suppression
level of the bottom, etc.
Note: The excessive setting may suppress slow-moving fish school as well.