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Control Unit: Push the A/C SEA control to display [MAN] on the [SEA] mode indica-
tion on the Status bar. Rotate the A/C SEA control to adjust the sea clutter.
Trackball module: Click the [SEA] mode indication on the Status bar to display
[MAN]. For coarse adjustment, put the cursor within the slider bar area then push the
left button. For fine adjustment, put the cursor at the end of the slider bar then roll the
trackball while pushing and holding down the left button. Release the button to finish.
2.8
How to Suppress Rain Clutter
The vertical beam width of the antenna 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 A/C RAIN control adjusts the receiver sensitivity as the A/C 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 A/C
RAIN control to split up these unwanted echoes into a speckled pattern, making rec-
ognition of solid targets easier.
Be careful not to remove all rain clutter, because you can erase weak echoes. Further,
the possibility of losing weak echoes is greater when you use both A/C RAIN and A/C
SEA to reduce clutter.
Note 1: When both sea clutter and rain clutter are reduced the sensitivity is decreased
more than when only one is adjusted. For that reason adjust them carefully.
Note 2: The echo average (see 2.16) is useful for reducing reflections from the sea
surface. However, high-speed targets are harder to detect than stationary ones when
the echo average is active.
2.8.1
How to reduce rain clutter automatically
Control Unit: Push the RAIN control to display
[AUTO1], [AUTO2], [AUTO3] or [AUTO4] on RAIN
mode indication on the Status bar. The higher the
number the greater the degree of rain clutter reduc-
tion.
Trackball module: Click the [RAIN] mode indication
on the Status bar to display [AUTO1], [AUTO2],
[AUTO3] or [AUTO4]. The higher the number the
greater the degree of rain clutter reduction.
2. RADAR, CHART RADAR OPERATION
RAIN mode indication
2-9
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Table of Contents
Troubleshooting
