1. OPERATION
Manual gain adjustment
While observing the screen and the gain tuning bar, press ◄ or ► to adjust the gain. The setting range is
3. Press the [MENU/ESC] key to finish.
1.8 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 scanner above the water, the further the clutter will extend. When sea clutter masks the picture, suppress it by the A/C SEA control.
Automatic adjustment by the A/C SEA control
Sea clutter, as well as rain clutter, can be automatically adjusted with the automatic A/C SEA function.
Manual adjustment of A/C SEA
The A/C SEA control reduces the amplification of echoes at short ranges (where clutter is the greatest) and progressively increases amplification as the range increases, so amplification will be normal at those ranges where there is no sea clutter.
The proper setting of the A/C SEA should be such that the clutter is broken up into small dots, and small targets become distinguishable.
If the setting is set too low, targets will be hidden in the clutter, while if the setting is too high, both sea clutter and targets will disappear from the display. In most cases adjust the control until clutter has disappeared to leeward, but a little is still visible windward.
Note: The auto A/C SEA function can erase weak target echoes. Adjust the control carefully watching the display.
Sea clutter at screen center
1.Press the [GAIN] key consecutively until the display shown below appears.
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| A/C SEA |
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| AUTO | : MODERATE |
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| MANU |
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| 20 |
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[GAIN] | : A/C RAIN MENU |
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[MENU/ESC] : Exit.
A/C SEA adjustment window
2.Press ▲ or ▼ to choose AUTO or MANU as appropriate.
Automatic A/C SEA adjustment
1)Press ► to open the automatic A/C SEA options window.
ROUGH
MODERATE
CALM
A/C SEA options
2)Press ▲ or ▼ to choose ROUGH, MODERATE or CALM depending on sea conditions.
3)Press ◄ to close the window.
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