1. OPERATIONAL OVERVIEW
1-12
1.10.3
Manual gain adjustment
1. Push the
GAIN
control to show “GAIN MANL” as the gain adjustment method.
2. Rotate the
GAIN
control to adjust the gain. Adjust the control so background noise is just visible
on the screen.
1.11
Suppressing Sea Clutter
Echoes from waves cover the central part of the display with random signals known as sea clutter.
The higher the waves, and the higher the antenna above the water, the further the clutter will
extend. When sea clutter masks the picture, use the
SEA
control to suppress the clutter, either
manually or automatically.
1.11.1
Choosing sea clutter adjustment method
Sea clutter may be adjusted automatically or manually. Push the
SEA
control to choose automatic
or manual adjustment alternately. The adjustment method currently chosen is show at the top right
corner of the screen. In the example below the sea clutter adjustment method is “MANL”
(manual).”
SEA indicator
1.11.2
Automatic sea clutter adjustment
1. Press the
MENU
key to open the menu.
2. Choose the Echo menu and then press the
ENTER
key.
3. Choose Auto Sea and then press the
ENTER
key.
4. Choose the sea condition which best matches the Auto Sea options.
5. Press the
ENTER
key followed by the
MENU
key to close the menu.
TUNE MANL
GAIN AUTO
SEA MANL
RAIN AUTO
SEA adjustment method (MANUAL)
Rough
Moderate
Calm
