Noise Rejector; Wiper - Furuno FAR-2218-BB Operator's Manual

1. OPERATIONAL OVERVIEW
1.26

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.
To remove this noise do the following:
1. Open the menu.
2. Select [1 ECHO].
3. Select [2 CUSTOMIZED ECHO].
4. Select [7 NOISE REJECTOR].
5. Select [OFF] or [ON] as appropriate, then press
the ENTER MARK key. The indication for noise rejection is located at the top-left
of the screen.
The indication changes according to the selected setting.
1.27

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.
Echo averaging [OFF]
Echo averaging on([1] or [2])
Condition A: The brilliance of unwanted weak echoes, such as noise, sea clutter and
rain clutter, is reduced to clear up the picture.
Condition B: Echo averaging is automatically acti-
vated 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 menu.
2. Select [1 ECHO].
3. Select [9 WIPER].
4. Select the desired setting.
The options are: [OFF], [1] or [2].
5. Close the menu.
1-38
Wiper setting 1 Wiper setting 2
Condition A Condition A
Condition A Condition B
Noise Rejector
indication