How To Shorten Pulse Length; How To Suppress Unwanted Echoes - Furuno FSV-25 Operator's Manual

[AGC Near]: Suppress gain in area closer than the [AGC Distance] setting.
[AGC Far]: Suppress gain in area that is beyond the [AGC Distance] setting.
8. Click
The setting range is 0.0 - 10.0. The larger the figure the greater the degree of sup-
pression. However, too high a setting may erase weak echoes.
9. Click [Quit] on the setting box to close the box.
10. Long-push the MENU/ESC key to close all menus.
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
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
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.
or to change the setting.
or to change the setting.
or to change the setting.
3. VERTICAL MODE
TX/RX Setting
H1 P1
H2 P1
TX Interval
TX Pulse Length
TX Power
Reverberation
Freq Shift
Hor. Beam Wid
Ver. Beam Wid
Quit
V P1
: 9
: 9
: 9
: 0
: 0
: 4
: 4
Quit
Cancel
2
(0.0~10.0)
3-9