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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
operate erraticly,
or
not at all.
To eliminate or
minimize the effects of
electrical
noise, firsttryto
determine
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
UltraNay II
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
equipment
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
re-route 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
awayfrom
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
starithe
engine.
Increase
the RPM with the
gearshift
in neutral. If noise
appears
on the
display,
the
problem
could
be one of three
things; spark
plugs,
alternator,
or
tachometer
wiring. Try
using
resistor
spark plugs,
alternator
filters,
or
routing
the sonar
unjt'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 fUhotion
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.
Read
your
transducer owner's manual for
the
best
mounting position.
WINDOWS SUMMARY
All of the window
groups
used
by
the
UltraNav II are shown on the
following
pages.
To view these
groups,
simply
press
the WINDOWS
key,
then re-
peated press
the down arrow
key.
This
will
"cycle'
the unit
through
all
groups.
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3210
BOG
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NOIISE
GROUP "A"
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GROUP "B"
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GROUP"F"
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GROUP"G"
38
39
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