2. SLANT MODE
2-16
2.9
How to Suppress Bottom and Sea Surface Re-
flections in Shallow Waters
In shallow fishing grounds with hard or rocky bottom, bottom reflections often interfere
with wanted fish echoes and they can not be eliminated sufficiently with the aforemen-
tioned TVG and AGC functions. This function is especially true when the TILT is set
to a larger angle in order to track schools of fish approaching within 400 m. In such
cases try to reduce the output power by adjusting the Tx output instead of turning
down the gain. The picture becomes clearer when output power is reduced rather than
when the GAIN is decreased as illustrated below.
How to reduce the TX power
1. Open the menu.
2. Select [1 TX/RX Setting], then left-click.
3. Select [3 Transmission Power], then left-click.
4. Left-click the
S
or
T
button to select the desired setting.
The setting range is [0] to [9]. The higher the setting, the greater the TX power.
5. Select [Quit], then left-click.
6. Close the menu.
TVG and AGC
adjusted with
TX POWER kept high
Fish echo
Fish echo
Fish echo
Fish echo
weakened
INCORRECT
METHOD
CORRECT
METHOD
Reduce TX POWER
with TVG and AGC
kept constant
Summary of Contents for FSV-75
Page 1: ...OPERATOR S MANUAL www furuno com HALF CIRCLE COLOR SCANNING SONAR Model FSV 75 FSV 75 3D ...
Page 78: ...2 SLANT MODE 2 44 This page is intentionally left blank ...
Page 110: ...4 FISH FINDER MODE 4 12 This page is intentionally left blank ...
Page 144: ...5 3D MODE 5 34 This page is intentionally left blank ...
Page 148: ...6 NUMERIC GRAPHIC DATA DISPLAY 6 4 This page is intentionally left blank ...
Page 158: ...7 HOW TO CUSTOMIZE THE SONAR 7 10 This page is intentionally left blank ...
Page 216: ...10 MAINTENANCE 10 28 This page is intentionally left blank ...
Page 234: ...INDEX IN 3 W Warning messages 10 5 X XSECT ON OFF button 5 6 Z Zoom in out 5 4 ...
Page 235: ......