Bedienungsanleitung Furuno 1761MK3 (Seite 14 von 33) (Englisch)

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echoes and the background noise on the dis-

play.

To adjust receiver sensitivity, transmit on long

range, and adjust the [GAIN] control so back-

ground noise is just visible on the screen.

Tips on adjusting GAIN

• In certain circumstances it may be useful

to reduce the gain slightly to improve

range resolution, clear up the picture, or

reduce clutter caused by rain or snow.

• Range resolution is a measure of the ca-

pability of a radar to display as separate

pips the echoes received from two targets

which are on the same bearing, and are

close together radially. With reduction in

the gain setting, the echoes may be made

to appear as separate pips on the display.

• When sailing or cruising in crowded re-

gions a slight reduction in gain often helps

to clear up the picture. This should be

done carefully, otherwise weak targets

may be missed.

• Echoes from ships inside a squall or storm

may be obscured if the gain is at its nor-

mal setting, since the clutter may have

masked, but not completely, echoes from

the targets.

Note: In all cases, return the gain to its origi-

nal position after any temporary reduction is

no longer required.

2.8 Adjusting the A/C SEA

Control

(reducing sea clutter)

Echoes from waves can be troublesome, cov-

ering the central part of the display with ran-

dom signals known as “sea clutter”. The

higher the waves, and the higher the antenna

above the water, the further the clutter will

extend. Sea clutter appears on the display

as many small echoes which might affect

radar performance. (See the left-hand figure

in Figure 2-2.) When sea clutter masks the

picture, adjust the A/C SEA control to reduce

the clutter.

How the A/C SEA control works

The [A/C SEA] control reduces the amplifi-

cation of echoes at short ranges (where clut-

ter is the greatest) and progressively

increases amplification as the range in-

creases, so amplification will be normal at

those ranges where there is no sea clutter.

Adjusting the A/C SEA control

The proper setting of the A/C SEA should be

such that the clutter is broken up into small

dots, and small targets become distinguish-

able.

If the control is set too low, targets will be

hidden in the clutter, while if it is set too high,

both sea clutter and targets will disappear

from the display. In most cases adjust the

control until clutter has disappeared to lee-

ward, but a little is still visible windward.

1. Confirm that the sensitivity is properly ad-

justed, and then transmit on short range.

2. Adjust the [A/C SEA] control so small tar-

gets are distinguishable but some clutter

remains on the display.

Sea clutter at

display center

A/C SEA control adjusted;

sea clutter suppressed.

Figure 2-2 How to adjust the A/C SEA

control

Tip for adjusting the A/C SEA

A common mistake is to over-adjust the cir-

cuit so all the removed. As an example set

up for maximum A/C SEA. You will see how

the center of the display becomes dark. This

dark zone can be dangerous (targets may

be missed), especially if the sensitivity is not

properly adjusted. Always leave a little clut-

ter visible on the display to be sure weak

echoes will not be suppressed. If there is no

clutter visible on the display, turn off the cir-

cuit.

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