Filter
Top Products
If
you
find noise interference from an electrical
instrument,
trolling
motor,
pump,
or
radio, tryto
isolatethe
problem.
You can
usually
reroutethe 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 unitfrom
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.
WINDOWS SUMMARY
All of the window
groups
used
by
the X-55A are shown on the
following
pages.
To view these
groups, simply press
the
WINDOWS
key,
then
repeated press
the down arrow
key.
This will
"cycle"
the unit
through
all
groups.
Remember,
each
group
can be
customized,
however the
group
will revert to the ones shown on these
pages
when
the unit is turned off.
SHOOT-THRU-HULL INSTALLATION
The transducer installation inside a
fiberglass
hull must
be in an area
that does not have air bubbles in the resin or
separated fiberglass
layers.
The sonar
signal
must
pass through
solid
fiberglass.
A success-
ful
transducer installation oan be made on hulls with flotation materials
(such
as
plywood,
balsa
wood,
or
foam)
between
layers
of
fiberglass
if
the material is removed from the chosen area. For
example,
some
manufacturers
use a
layer
of
fiberglass,
then a core of balsa
wood,
finishing
with an outer
layer
of
fiberglass. Removing
the inner
layer
of
fiberglass
and the balsa wood core
exposes
the outer
layer
of
fiberglass.
The transducer can then
be
epoxied directly
to the outer
layer
of fiber-
glass.
After
the
epoxy
cures,
the hull is
watertight
and
structurally
sound.
Remember,
the
sonar
signal
must
pass
through
solid
fiberglass. Any
air
bubbles in the
fiberglass
or the
epoxy
will reduce or eliminate the sonar
signals.
To choose the
proper
location for thru-hull
mounting,
anchor the boat in
60 feet of water.
Add a little water to the
sump
of the boat.
Plug
the
transducer into the sonar
unit,
turn it
on,
then hold the transducer over
FILL WITH
EPOXY,J?1
INNER HULL
—
)
-a
Epoxy TO HULL
FIRST—
OUTER HULL
the side of the boat.
Adjust
the
sensitivity
and
range
controls until a
second bottom echo
is seen on the
display. (you
will need to turn the
automatic function off on L.C.G.
units.)
Don't touch the controls once
they've
been set.
Next,
take the transducer out of the
water and
place
it
in the water in the
sump
of the boat. Observe
the sonar
signal
to see if
there is a noticeable decrease in
sensitivity.
The second
bottom
signal
may disappear
and the bottom
signal may
decrease in
intensity.
Move
the transducer around to find the best
location. If the
sensitivity
control
has to be increased
greatly
to
compensate,
then
the transducer should
be mounted on the
outside of the hull. If
not,
then mark the location that
shot
through
the hull the best and follow
the instructions on the next
pages
for a shoot-thru-hull
mounting.
44
9
PDF compression, OCR, web-optimization with CVISION's PdfCompressor