Change Near Gain, Far Gain; How To Adjust Strong, Weak Echoes; Agc Near, Agc Far, Agc Distance - Furuno FSV-25 Operator's Manual

3. VERTICAL MODE
3.7.2

Change near gain, far gain

This sonar lets you adjust near gain and far gain separately.
1. Press the MENU/ESC key to open the main menu.
2. Click [Gain Setting].
3. Press the H/V/S key to select the [V] tab.
4. Click [Near Gain Distance] or [Far Gain Distance].
5. Click
6. Click [Quit].
7. Click [Near Gain] or [Far Gain].
[Near Gain]: Adjust sensitivity in area closer than [Near Gain Distance].
[Far Gain]: Adjust sensitivity in area further than [Far Gain Distance].
8. Click
The setting range is 0.0 to 10.0. Setting" 5" does not correct the gain. Use a setting
lower than 4 to lower the gain, or use a setting higher than 5 to raise the gain.
9. Click [Quit] on the setting box to close the box.
10. Long-push the MENU/ESC key to close all menus.
3.8

How to Adjust Strong, Weak Echoes

3.8.1

AGC Near, AGC Far, AGC Distance

The AGC function automatically reduces the receiver gain only against strong echoes
such as the bottom or a large school of fish. Since the AGC function does not affect
weak echoes, a small school of fish becomes easier to detect. The FSV-25 has three
types of AGC settings, [AGC Distance], [AGC Near], and [AGC Far]. Adjust them so
that the AGC works only on bottom reflections. Do not set it too high; weak echoes
may be missed.
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 [AGC Distance] to show the setting box.
5. Click
The setting range is 20 - 5000 m, in 20 m increments.
6. Click [Quit] on the setting box to close the box.
7. Click [AGC Near] or [AGC Far] to show the setting box.
3-8
or to select a suitable value.
or as appropriate then push the left button.
or to change the setting.
Quit
Cancel
2
(0.0~10.0)
Quit
Cancel
400m
(20~1600)
Quit
Cancel
20m
(20~5000)