1. OPERATIONAL OVERVIEW
1-27
1.24.4 How to suppress false echoes
The echo signals can appear on the screen at positions where there is no target or
disappear when there are targets (see section 2.2). You can suppress the false
echoes.
1. Open the [MAIN MENU].
2. Select [ECHO], then push the ADJUST knob.
3. Select [0 ACE] (For non-IMO radars) or [9 ACE] (IMO radars), then push the AD-
JUST knob.
4. Select [SUPPRESS SECTOR], then push the ADJUST knob.
5. Rotate the ADJUST knob to set the starting angle for sector to be suppressed,
then push the ADJUST knob.
6. Rotate the ADJUST knob to set the angle range of the sector to be suppressed,
then push the ADJUST knob.
7. Close the menu.
1.25 Noise Rejector
White noise can show itself on the screen as random “speckles” spread over the entire
radar image. This equipment reduces the white noise, then improves the on-screen S/
N ratio by processing the weighted moving average filter for the received echoes in
the range direction.
Note: Use this function with caution. Weak target echoes may disappear from the
screen or the range resolution may worsen.
You can remove this noise by placing the cursor inside the [NR] box at the left side of
the screen, then press the left button to select [ON] or [OFF].
1.26 Wiper
The wiper feature automatically reduces the brilliance of weak signals (noise, sea clut-
ter, rain clutter, etc.) and unwanted signals such as radar interference to clear the pic-
ture of unwanted echoes. Its effect depends on the wiper setting used and whether
each averaging is turned on or off, as described below.
Condition A: The brilliance of unwanted weak echoes, such as noise, sea clutter and
rain clutter, is reduced to clear up the picture. The difference between wiper setting [1]
and [2] is that brilliance is lowered more slowly in [2].
Condition B: Echo averaging is automatically activated when the wiper feature is
turned on, allowing you to instantly see how the picture is affected with echo averaging
turned off and turned on.
To activate the wiper feature, do the following:
1. Open the [MAIN MENU].
Wiper setting 1 Wiper setting 2
Echo averaging OFF Condition A Condition A
Echo averaging ON(1/2/3) Condition A Condition B
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