Furuno FSV-85, Operator'S Manual

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4. SLANT MODE
4-8
TVG distance and setting
This sonar has three TVG functions, Near, Medium and Far, and they mainly compen-
sate for propagation loss on short, middle and long ranges respectively, centered at
the ranges shown below. The higher the TVG setting the greater the amplification of
echoes. For details, see chapter 2.
4.8 How to Adjust Strong, Weak Echoes
4.8.1 AGC
The AGC functions to automatically reduce the receiver gain only against strong ech-
oes such as the bottom or a large school of fish. Since weak echoes remain unaffect-
ed, a small school of fish becomes easier to detect. Adjust it 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. Select [Gain Setting] then push the left-click button.
3. Press the
H/V/S key to select the [S] tab.
4. Select [AGC] then push the left-click button.
5. Select S or T then push the left-click button to change the setting.
The setting range is -20 to 20. The higher the setting, the higher the degree of sup-
presion.
6. Select [Quit] on the setting box then push the left-click button to close the box.
7. Long-press the
MENU/ESC key to close all menus.
Approx. 50 m
Near
Far
Med
Approx. 300 m
Approx. 680 m