Onwa KF-667 manual Suppressing Interference, Suppressing Low Level Noise

2.12 Suppressing Interference

Interference from other acoustic equipment operating nearby or other electronic equipment on your boat may show itself on the display as shown below.

To suppress interference, do the following:

1.Select MENU1 with the [MODE ]switch.

2.Select NOISE LIMITER.

3.Press [+] or [-] to select degree of suppression desired. 3 provides the highest degree of suppression.

Interference from	Electrical interference
other sounder

Turn the noise limiter circuit off when no interference exists, otherwise weak echoes may be missed.

2.13 Suppressing Low Level Noise

Light-blue dots may appear over most of screen. This is mainly due to unclean water or noise. This noise can be suppressed by adjusting CLUTTER on the menu.

When the automatic mode is on, the clutter suppression setting is fixed at AUTO. To suppress low level noise in manual sounder operation do the following:

1.Select MENU1 with the [MODE] switch.

2.Select CLUTTER LEVEL.

3.Press [+] or [-] to select degree of suppression desired, 3 provides the highest degree of suppression.

Low level noise

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