1. OPERATIONAL OVERVIEW
1-21
How to reduce sea clutter manually from the on-screen box
1. Select [SEA MAN], following the procedure in paragraph 1.19.1.
2. Place the arrow in the A/C SEA level indicator at the top of the display.
3. While observing the A/C SEA level indicator, rotate the ADJUST knob clockwise
to increase the A/C SEA or counter-clockwise to decrease it. The setting range is
[0] to [100].
1.20 How to Reduce Rain Clutter
Use the AUTO RAIN and A/C RAIN to reduced rain clutter. AUTO RAIN reduces rain
clutter in the picture and A/C RAIN reduces clutter picked up by the antenna.
Note 1: When both sea clutter and rain clutter are reduced, the sensitivity is de-
creased more than when only one is changed. For that reason adjust them carefully.
Note 2: The echo average (see "Echo Averaging" on page 1-24) 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.
1.20.1 How to select the method of rain clutter reduction
Select the [RAIN] indication at the top-right of the screen, then press the left button
to toggle [RAIN AUTO] (automatic reduction) and [RAIN MAN] (manual reduction).
1.20.2 How to manually reduce 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 peri-
od (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 recog-
nition of solid targets easier. Be careful 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.
How to fine-tune sea clutter reduction from the control unit (RCU-028)
Rotate the AC/RAIN knob (F1). Rotate anticlockwise to decrease the AC/SEA, or
clockwise to increase the A/C SEA.
Left-click inside the box to change the A/C RAIN
adjustment method (RAIN AUTO or RAIN MAN)
Rain clutter at
screen center
A/C RAIN control adjusted;
rain clutter reduced
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