1. OPERATIONAL OVERVIEW
1-13
1.11.3
Manual sea clutter adjustment
1. Push the
SEA
control to show “SEA MANL” as the SEA adjustment method.
2. Rotate the
SEA
control to suppress sea clutter.
The proper setting of the
SEA
control 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.
How to adjust the
SEA
control
1.12
Suppressing Rain Clutter
The vertical beamwidth of the scanner is designed to see surface targets even when the ship is
rolling. However, by this design the unit will also detect rain clutter (rain, snow, or hail) in the same
manner as normal targets.
The
RAIN
control adjusts the receiver sensitivity as the
SEA
control does but rather in a longer
time period (longer range). The higher the setting the greater the anti-clutter effect. When echoes
from precipitation mask solid targets, adjust the control to split up these unwanted echoes into a
speckled pattern, making recognition of solid targets easier.
1.12.1
Choosing rain clutter adjustment method
Rain clutter may be adjusted automatically or manually. Push the
RAIN
control to choose auto-
matic or manual adjustment alternately. The adjustment method currently chosen is show at the
top right corner of the screen. In the example below the adjustment method is “AUTO.”
RAIN indicator
SEA adjusted;
sea clutter suppressed
Sea clutter at
screen center
TUNE MANL
GAIN AUTO
SEA MANL
RAIN AUTO
RAIN adjustment method (AUTO)
