Furuno FSV25S, Operator'S Manual

Page: 83 / 163

3. VERTICAL MODE
3-9
3.8.2 How to shorten pulse length
The pulse length determines the length of the transmission pulse emitted into the wa-
ter. While a longer pulse is advantageous for long-range sounding, it has the disad-
vantage of being poor in discrimination of targets, that is, the ability to separate several
closely located targets. When searching bottom fish, therefore, it is useful to shorten
the pulse length in order to separate fish echoes from bottom reflections. Decrease
the pulse length setting to shorten the pulse length.
Note: For search of surface and midwater fish in which bottom reflections are not so
strong, use the longest pulse length 9.
1. Press the MENU/ESC key to show the
main menu.
2. Click [TX/RX Setting].
3. Press the
H/V/S key to select the [V]
tab.
4. Click [TX Pulse Length].
5. Click
S
or
T
to change the setting.
The setting range is 0-9. The higher
the setting, the longer the pulse length.
6. Click [Quit] on the setting box to close
the box.
7. Long-push the MENU/ESC key to
close all menus.
3.8.3 How to suppress unwanted echoes
This sonar’s noise suppressor removes weak echoes such as sea surface reflections
and echoes from plankton. Because the noise suppressor does not work against
strong echoes it is useful for detecting schools of fish.
1. Press the MENU/ESC key to show the main menu.
2. Click [Gain Setting].
3. Press the
H/V/S key to select the [V] tab.
4. Click [Noise Suppress] to show the setting box.
5. Click
S
or
T
to change the setting.
The higher the setting, the higher the degree of suppression.
6. Click [Quit] to close the box.
7. Long-push the
MENU/ESC key to close all menus.
TX/RX Setting Quit
H1 P1
H2 P1
TX Interval : 9
TX Pulse Length : 9
TX Power : 9
Reverberation : 0
Freq Shift : Mid
Hor. Beam Width : 4
Ver. Beam Width : 4
V P1
Quit
Cancel
2
(0.0~10.0)