Finding the Cause of Noise
Electrical noise usually affects the display with many black dots at high speeds,
and high sensitivity readings. One or more of the following sources can cause
noise or interference:
Possible Source of Noise
Isolation
Other electronic devices
The boat’s engine
Cavitation from the boat’s
propeller
Turn off any nearby electronic devices to see if the
problem goes away, then turn them on one at a
time to see if the noise re-appears.
To determine whether the boat’s engine is the
source of the noise, increase the RPMs while the
boat is in neutral and stationary to see if the noise
increases pro-portionately; if noise appears when
you rev the engine, the problem could be the spark
plugs, alternator, or tachometer wiring. Replace
the spark plugs with resistor plugs, install an
alternator filter, or route the control head power
and transducer cables away from the engine
wiring.
Turbulence created by the propeller can cause
noise; make sure the transducer is mounted at
least 15” (38 cm) from the propeller, and that the
water flows smoothly over the face of the
transducer at all times.
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