Furuno FSV-75, Руководство оператора

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4. FISH FINDER MODE
4-6
3. Select [4 Clutter], then left-click.
4. Select [1 Clutter Level], then left-click.
5. Left-click the
S or T button to select the desired setting.
The larger the setting, the greater the degree of clutter rejection.
6. Select [Quit], then left-click.
7. Select [2 Clutter Type], then left-click.
8. Select the desired setting, then left-click.
• [Standard]: Strong color echoes are displayed as is and weak
echoes are shown smaller, when the clutter level setting is raised.
• [Liner]: All echoes are displayed smaller, when the clutter level setting is raised.
9. Select [Quit], then left-click.
10. Close the menu.
4.10 How to Adjust TVG (Time Varied Gain)
A school of fish at a deep depth is displayed in weak colors even if it is equal in
strength to one in shallow waters. This is due to propagation attenuation of the ultra-
sonic wave. To compensate for this difference, use TVG. TVG automatically adjusts
the gain with depth so that echoes of the same strength and different depths are
shown in the same colors regardless of their depths. The gain is increased with depth
to display echoes of equal strengths in the same colors. In the following figure, for ex-
ample, the TVG is set for 100 m and the TVG level is adjusted. Then, unwanted
echoes at a distance less than 100 m are deleted and echoes at depths greater than
100 m are not affected.
1. Open the menu.
2. Select [6 Fish Finder], then left-click.
0 m
100 m
0 m
100 m
TVG OFF:
Schools of fish of equal strengths
shown in different sizes and colors.
TVG adjusted:
Schools of fish of equal strengths
shown in same sizes and colors.
Unwanted echoes
appear. Unwanted echoes
suppressed.