Furuno 1834C-BB User Manual

4. VIDEO SOUNDER OPERATION

4-10

1. Press the MENU key.

2. Press the A: SOUNDER MENU soft key.

3. Select NOISE LIMITER, then press the A: EDIT soft key to show the noise limiter

window.

NOISE LIMITER

▲

OFF

LOW

MEDIUM

HIGH

▼

Noise limiter window

4. Use the Trackball

to select the degree of suppression desired (LOW, MEDIUM, HIGH),

or turn the noise limiter off.

5. Press the E: RETURN soft key followed by the MENU key to close the menu.

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

missed.

4.6 Reducing Low Level Noise

Light-blue dots may appear over most of the screen. This is mainly due to sediment in the

water, or noise. This noise can be suppressed by adjusting CLUTTER on the SOUNDER

menu.

Appearance of clutter

When the automatic sounder mode is used, clutter is automatically adjusted. To reduce low

level noise in manual sounder operation do the following:

1. Press the MENU key.

2. Press the A: SOUNDER MENU soft key.

3. Select CLUTTER, then press the A: EDIT soft key to show the clutter window.

CLUTTER

▲

▼

Clutter window