1. OPERATIONAL OVERVIEW
1-20
1.18 How to Adjust Sensitivity
The gain control adjusts the sensitivity of the receiver.
The proper setting is such that the background noise is just visible on the screen. If
you set up for too little sensitivity, weak echoes may be missed. On the other hand
excessive sensitivity yields too much background noise; strong targets may be missed
because of the poor contrast between desired echoes and the background noise on
the display.
To adjust receiver sensitivity, adjust the gain control so background noise is just visible
on the screen.
How to adjust the GAIN from the control unit (RCU-028)
Rotate the GAIN knob (F3). Rotate anticlockwise to decrease the gain, or clockwise
to increase the gain.
How to adjust the GAIN from the on-screen box
1. Place the cursor in the [GAIN] box at the top of the screen.
2. Rotate the ADJUST knob anticlockwise to decrease the gain, or clockwise to in-
crease the gain. The setting range is [0] to [100].
1.19 How to Reduce 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 extends. When sea clutter masks the picture, reduce it with the A/C
SEA control, either manually or automatically.
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 1-25) 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.
1.19.1 How to select the method of clutter adjustment
1. Place the cursor in the [SEA AUTO] or [SEA MAN] (whichever is shown) at the top
of the display.
2. Press the left button to display [SEA AUTO] or [SEA MAN] as appropriate.
Place arrow inside
window to adjust gain.
Level bar
Place arrow inside window
to adjust A/C SEA.
A/C SEA adjustment method
(SEA AUTO or SEA MAN)
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