Reverberation; Echo Average; 2Nd Echo Rejection; How To Adjust Beamwidth - Furuno FSV-25 Operator's Manual

2.9.6

Reverberation

You can reduce the strength of reverberation from sea-surface, sea-bottom and plank-
ton layer, with [Reverberation] on the [TX/RX Setting] ([H1] or [H2] tab). The setting
range is 0 to 3. The reverberation setting is automatically set to "0" when the range is
100 m or less. The larger the setting, the greater the reduction in reverberation. Select
a value that reduces reverberation while showing echo signals clearly.
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 afterglow remains on
the screen longer as the setting is increased.
2.9.8

2nd echo rejection

A target that is farther than the repetition interval of transmission may appear as a vir-
tual image on the screen one time later. This is called secondary echo. Reflections
from tracks are so strong that secondary echoes appear easily. To remove secondary
echoes, set [2nd Echo Rej.] (located on the [H1] tab of the [Picture Setting] menu) to
other than "0" (OFF),
2.10

How to Adjust Beamwidth

The width of the horizontal and vertical beam can be adjusted from the [TX/RX Setting]
menu.
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 [H1] or [H2] tab.
4. Click [Hor. Beam Wid] or [Ver. Beam Wid].
5. Click
range is 0 to 4. The higher the setting the sharper the beamwidth.
6. Click [Quit] on the setting box to close the box.
7. Long-push the MENU/ESC key to close all menus.
TX/RX Setting
H1 P1
TX Interval
TX Pulse Length
TX Power
Reverberation
Freq Shift
Hor. Beam Wid
Ver. Beam Wid
(raise setting) or (lower setting) to adjust the beamwidth. The setting
Quit
H2 P1 V P1
: 9
: 9
: 9
: 0
: 0
: 4
: 4
2. HORIZONTAL MODE
2-17