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Weak bottom
echo, digital readings
erratic,
or no
fish
signals (cont.):
INTRODUCTION
2. Electrical
noisefromthe
boat's motorcan interfere with the
sonar. Thiscauses
the sonar to
automatically
increase
its Discrimination or noise
rejection
feature.
This can cause the
unit to eliminate
weakersignals
such
as fish or even structure
from the
display,
3. The water
may
be
deeper
than the sonar's
ability
to find the bottom. If
the
sonar can't find the
bottom
signal
while it's in the
automatic
mode,
the
digital
will
flash
continuously.
It
may change
the
range
to limits far
greaterthan
the
water
you
are in. If this
happens, place
the unit in the manual mode,
then
change
the
range
to a realistic one,
(for example,
0-100
feet)
and increase the
sensitivity.
As
you
move Into shallower water,
a bottom
signal
should
appear.
4. Check the
battery
voltage,
lithe
voltage drops,
the unit's transmitter
power
also
drops,
reducing
its
ability
to find the bottom or
targets.
Bottom echo
disappears
at
high speeds
or erratic
digItal reading
or weak
bottom echo
while boat is
moving
1. The
transducer
may
be in turbulent
water. It must be mounted in a smooth
flow of water
in orderforthe sonar
to work at all boat
speeds.
Air
bubbles in the
water
disrupt
the sonar
signals, interfering
with its
ability
to find the bottom
or
other
targets.
The technical term
for this is 'Cavitation'.
2. Electrical noisefromthe boat's motorcan
interfere with the sonar. This
causes
the sonarto
automatically
increase its Discrimination
or noise
rejection
feature.
This can causethe unit to eliminate
weakersignals
such asfish oreven
structure
from
the
display. Try using resistorspark plugs
or
routing
Ihe sonar
unit's
power
and transducer cables
away
from
other electrical
wiring
on the boat.
No
fish arches when the Fish ID feature
Is off:
1. Make
certain the transducer is
pointing
straight
down. This is the most
common
problem
if a
partial
arch is
displayed.
See the Fish Arch section in
your
owner's
manual for more information.
2. The
sensitivity may
not be
high
enough.
In orderforthe unit to
display
a fish
arch,
it has to be able to receive the fish's
echo from the time it enters the
cone
until It
leaves. If the
sensitivity
is not
high enough,
the unit
displays
the fish
only
when
it is in the center of the cone.
3. Use the
Zoom feature. It is much easierto
display
fish
arches when zoomed
in on
a small
range
of waterthan a
large
one. For
example, you
will have much
better luck
seeing
fish arches with a
30 to 60 foot
range
than aD to 60 foot
range.
This
enlarges
the
targets, allowing
the
display
to
show much more detail.
Thank
you
for
purchasing
a
Lowrancq
sonar. Your X-25 is a
high
quality
sonar
designed
for both
professional
and novice fishermen.
These
units have an automatic feature
that finds and
displays
the
bottom, fish,
structure,
and morel
All
you
have to do is
press
the
on
s.
key.
However,
if
you
wish to fine tune
the
unit,
all
you
have to do is
press
the
menu
key.
The X-25 has
powerful
features available
through
easy-to-use
menus.
To
get
started
with
your
unit,
first read the
installation section.
This is
where
it all
begins, Improper
installation
can cause
problems
down
the
road.
After
you've
read the
instnjctions,
install the
unit,
then read the
rest of the
manual. The more
you
know about
your
unit,
the
better it
will
perform
for
you.
Take this
manual for reference when
you
head for
the
water.
INSTALLATION
Mount the X-25 in
any
convenient location,
provided
there is clearance
when
it's tilted for the best
viewing angle.
Holes in the bracket's
base
allow wood screw or
through
bolt
mounting.
It
may
be
necessary
to
place
a
piece
of
plywood
on the back
side of thin
panels
to 'reinforce
the
panel.
Make certain there
is
enough
room behind the unit
to attach
the
power
and transducer cables.
Drill a hole in the dash for the
power
and transducer cables.
The best
location
for this hole is
immediately
under the
gimbal
bracket.
This
way,
the bracket
covers the hole. The smallest
hole both the
power
and transducer cables can
pass through
is
one
inch. However,
you
can't
pass
a
power
or transducer connector
and another cable
through
1
24
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