2. HORIZONTAL MODE
2-14
When a fish school is located on a long range setting (about 800 meters)
and is approaching own ship do as follows:
Adjust the tilt to keep the fish school in the center of the sonar beam, namely,
fish school is displayed in strongest colors possible. Confirm that the fish
echo is displayed in the same color as it approaches. If the color suddenly
changes to weaker colors as the fish enters MEDIUM and NEAR areas, the
TVG is improperly set. Adjust the TVG. If this again produces sea surface
reflections and noise try to remove them with the AGC and noise limiter.
Note:
If the above procedure does not produce satisfactory results, the
TVG curve can be changed on the OTHERS sub menu in the H-SCAN
SETTING menu. Also, adjust the setting of NEAR AGC, referring to
next section.
2.7
Suppressing Bottom Tail
2.7.1 AGC
The AGC functions to automatically reduce the receiver gain only against strong
echoes such as the bottom or a large fish school. Since weak echoes remain
unaffected, a small fish school 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] key to open the menu.
2. Select H-SCAN SETTING menu and press the [MENU] key.
3. Select AGC and press the [MENU] key.
4. Adjust setting from the dialog box as appropriate and press the [MENU] key.
The setting range is 0-9. The higher the setting the greater the degree of
suppression.
5. Select QUIT and press the [MENU] key to conclude.
6. Select QUIT at the top of the menu screen and press the [MENU] key to
close all menus.
Summary of Contents for FSV-30
Page 1: ...COLOR SCANNING SONAR FSV 30 ...
Page 14: ...This page is intentionally left blank ...
Page 30: ...1 OPERATIONAL OVERVIEW 1 16 This page is intentionally left blank ...
Page 80: ...2 HORIZONTAL MODE 2 50 The page is intentionally left blank ...
Page 100: ...3 VERTICAL MODE 3 20 The page is intentionally left blank ...
Page 122: ...5 6 This page is intentionally left blank ...
Page 136: ...7 10 This page is intentionally left blank ...
Page 152: ...8 OTHERS MENU 8 16 This page is intentionally left blank ...
Page 170: ...10 MAINTENANCE TROUBLESHOOTING 10 14 This page is intentionally left blank ...
Page 174: ...SP 4 This page is intentionally left blank ...
Page 182: ...ORIGINAL SETTING AP 8 New Original setting ...
Page 183: ...ORIGINAL SETTING AP 9 ...
Page 184: ...ORIGINAL SETTING AP 10 ...
Page 185: ...ORIGINAL SETTING AP 11 Color setting ...
Page 186: ...ORIGINAL SETTING AP 12 Color Response Curve setting ...