Furuno FCV-600L Suppressing Interference, Suppressing Low Level Noise, Background and echo colors

1.14 Suppressing Interference

Interference from other acoustic equipment operating nearby or other electronic equip- ment on your boat may show itself on the dis- play as shown in Figure 1-28.

To suppress interference, do the following:

1.Press the MENU ESC key to display the User menu.

2.Select NOISE LIMITER.

3.Press tor sto select degree of suppres- sion desired; OFF, NL1, NL2 or NL3. The higher the number the greater the degree of suppression.

4.Press the MENU ESC key.

3.Press t or s to select clutter rejection level desired. The higher the number the higher the degree of suppression. Note that weak echoes may not be displayed when the clutter circuit is on.

4.Press the MENU ESC key.

Figure 1-29 Clutter appearance

Interference from	Electrical inteference
other sounder

Figure 1-28 Forms of interference

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

1.15Suppressing Low Level Noise

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

When the automatic mode is on, the clutter suppression setting is fixed at AUTO. To sup- press low level noise in manual sounder op- eration do the following:

1.Press the MENU ESC key.

2.Select CLUTTER.

1.16Selecting Background and Echo Colors

1.Press the MENU ESC key.

2.Select HUE.

3.Press t or s to select hue arrangement number. (You can see the result of your selection behind the menu.) Table 1-2 shows hue no., echo color and background color.

Table 1-2 Background and echo colors

Hue	Echo Color	Background Color
No.
1	16 color	Medium-blue
2	8 color	Medium-blue
3	16 color	Dark-blue
4	8 color	Dark-blue
5	16 color	White
6	8 color	White
7	16 color	Black
8	8 color	Black
9	Monochrome, 8 intensities

4. Press the MENU ESC key.

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