NOISE
KEYBOARD
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.
Toeliminate
orminimizethe 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
Ultra Ill
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 beenturned
on,
theireffect on
thesonardisplay noted,
thenturned 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
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 exceptthe
sonar unit is turned
off,
then startthe
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 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.
Read
your
transducer
owner's manual for the
best
mounting position.
The
keyboard
has
keys arranged
in two vertical columns
plus
a
horizontal
row
at the bottom. The
keys
in the
left column are used to enter numbers
and menu
selections. The
keys
in the
right
column activate the
windows
feature and the basic sonar functions. The menu
key
in the
bottom
right
corner of
the
keyboard
activates the first menu
page.
The
keys along
the
bottom of
the screen are used to activate the alarm
menu,
stop
the
chart,
and make menu
selections with the arrow
keys.
WINDOWS
-
This
key gives you
access to the windows
mode,
which lets
you
customize
displays.
SENS
-
Press
this
key
to
adjust
the unit's
sensitivity
and
Grayline.
RANGE
-
This
key
lets
you
adjust
the
range
when the unit is in the manual
ZOOM
-
The Ultra
gives you
2X and 4X zoom
capability
with this
key.
AUTO
-
This turns the
automatic feature off and on.
MENU
-
Press this
key
to show the menus and
gain
access to most
functions.
CLEAR
-
This
key
clears menus and erases entries from the
screen.
ALARM
-
Press this
key
to activate
any
of the sonar alarms.
STOP
-
When this
key
is
pressed,
the chart
stops scrolling.
This doesn't
affect the
digital display,
however.
mode.
39
8
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