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

2.7

How to Adjust Strong, Weak Echoes

2.7.1

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 [H1] or [H2].
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.
[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.
Cancel
(20~5000)
or to change the setting.
Cancel
(0.0~10.0)
or to change the setting.
Quit
20m
Quit
2
2. HORIZONTAL MODE
2-11