Manual Lowrance X-70A 3D (page 39 of 44) (English)

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NOISE

A major cause of sonar problems is electrical noise. This usually appears

on the sonar’s display as random patterns of dots or lines. In severe cases,

it can completely cover the screen with black dots, or cause the unit oper-

ate erratically, or not at all.

To eliminate or minimize the effects of electrical noise, first try to deter-

mine the cause. With the boat at rest in the water, the first thing you should

do is turn all electrical equipment on the boat off. Make certain the engine

is off, also. Turn your X-70A 3D on, then turn off ASP (Advanced Signal

Processing). There should be a steady bottom signal on the display. Now

turn on each piece of electrical equipment on the boat and view the effect

on the sonar’s display. For example, turn on the bilge pump and view the

sonar display for noise. If no noise is present, turn the pump off, then turn

on the VHF radio and transmit. Keep doing this until all electrical equip-

ment has been turned on, their effect on the sonar display noted, then

turned off.

If you find noise interference from an electrical instrument, trolling motor,

pump, or radio, try to isolate the problem. You can usually reroute the

sonar unit’s power cable and transducer cable away from the wiring that

is causing the interference. VHF radio antenna cables radiate noise when

transmitting, so be certain to keep the sonar’s wires away from it. You may

need to route the sonar unit’s power cable directly to the battery to isolate

it from other wiring on the boat.

If no noise displays on the sonar unit from electrical equipment, then make

certain everything except the sonar unit is turned off, then start the en-

gine. Increase the RPM with the gearshift in neutral. If noise appears on

the display, the problem could be one of three things; spark plugs, alter-

nator, or tachometer wiring. Try using resistor spark plugs, alternator fil-

ters, or routing the sonar unit’s power cable away from engine wiring.

Again, routing the power cable directly to the battery helps eliminate noise

problems. Make certain to use the in-line fuse supplied with the unit when

wiring the power cable to the battery.

When no noise appears on the sonar unit after all of the above tests, then

the noise source is probably cavitation. Many novices or persons with

limited experience make hasty sonar installations which function perfectly

in shallow water, or when the boat is at rest. In nearly all cases, the cause

of the malfunction will be the location and/or angle of the transducer. The

face of the transducer must be placed in a location that has a smooth flow

of water at all boat speeds.

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Lowrance X-70A 3D Manual

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