Humminbird 363 Operation Manual page 49

531448-1_A - 363_Man_Eng.qxd 11/9/2005
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 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.
The boat's engine 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 proportionately; 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.
Cavitation from the Turbulence created by the propeller can cause
boat's propeller 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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Specifications
Depth Capability ................................................................................ 1000 ft (330 m)
Power Output .................................. 300 Watts (RMS), 2400 Watts (Peak to Peak)
Operating Frequency .................................. 200 kHz and 83 kHz DualBeam PLUS
Area of Coverage.................................................................... 60° @ -10 dB in 83 kHz
Target Separation .................................................................. 2 1/2 Inches (63.5 mm)
Power Requirement.................................................................................... 10-20 VDC
LCD ........................................................................................................ 320 V x 240 H
Transducer.................................................................................................. XHS-9-20-T
Transducer Cable Length............................................................................ 20 ft (6 m)
Current Draw ............................................................................................0.383 Amps
NOTE: Humminbird® verifies maximum stated depth in saltwater conditions, but actual
depth performance may vary due to transducer installation, water type, thermal layers,
bottom composition and slope.
NOTE: Product specifications and features are subject to change without notice.
90
TM
20° @ -10 dB in 200 kHz