How To Suppress Bottom And Sea Surface Reflections In Shallow Waters - Furuno FSV-75 Operator's Manual

2. SLANT MODE
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.
INCORRECT
METHOD
CORRECT
METHOD
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
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.
2-16
Fish echo
TVG and AGC
adjusted with
TX POWER kept high
Fish echo
Reduce TX POWER
with TVG and AGC
kept constant
or button to select the desired setting.
Fish echo
weakened
Fish echo