Furuno FSV-35S, Operator'S Manual

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2. HORIZONTAL MODE
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2.9.6 Reverberation
You may select the length of reverberation for the echo signal, with [Reverberation] on
the [TX/RX Setting] (H1 or H2 tab). The setting range is 0 to 5. The larger the setting,
the lower the reverberation effects. Set the length of reverberation properly to make it
easier to see the echo signal.
2.9.7 Echo average
[Echo Average] (H1 or H2 tab) on the [Picture Setting] menu adjusts echo afterglow -
the amount of time an echo signal remains on the screen. This feature can be useful
for watching echo movement. The setting range is 0 to 11.
Setting between 1 and 7 :
Echoes are gradually displayed and afterglow remains on the screen longer as the
setting is increased.
Setting between 8 and 11 : Echoes are quickly displayed and af-
terglow remains on the screen longer as the setting is increased.
2.9.8 Reference bearing in frequency shift
The reference bearing in frequency shift can be changed to avoid sonar interference
and noise. If noise or interference appears at a specific bearing, change the value of
the [Freq/Bearing Set] in the [TX/RX Setting] (H1 or H2 tab) menu. The setting range
is 0 to 31 (0° to 348.75°) and the default setting is 16 (180°).
Note: [Freq/Bearing Set] is valid when [Sidelobe Sup] is selected to other than 0°.
2.9.9 How to suppress the gain of bottom echo
Stationary echoes such as bottom echo, plankton echo, etc., may be suppressed with
[Bottom Suppress] in [TX/RX Setting] (H1 or H2 tab). Moving echoes such as fish
school are not affected by this setting. The setting range is 0 to 10. The higher the set-
ting, the greater the suppression level of the bottom echoes.
Note: Do not use an unnecessarily high setting since it may also suppress slow-mov-
ing fish echoes.
2.10 How to Adjust Beamwidth
The width of the horizontal beam can be adjusted from the [Beam Width] menu.
1. Press the MENU/ESC key to show the main menu.
2. Select [TX/RX Setting] then push the left-click button.
3. Press the
H/V/S key to select the [H1] or [H2] tab.
4. Select [Beam Width] then push the left-click button.
5. Select [Beam] then push the left-click button.
6. Select [
S ] (raise setting) or [ T ] (lower setting) to adjust the beamwidth. The set-
ting range is -4 to 30 and AR.
-4 to -1: Raise the setting to sharpen the vertical beamwidth.