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Weak bottom
echo, digital readings
erratic,
or no fish
signals (cont4:
INTRODUCTION
2. Electrical
noisefromthe boat's motorcan interfere wlththe sonar. This
causes
the sonar to
automatically
increase its Discrimination
or noise
rejection
feature.
This can cause the unit to eliminate
weakersignals
such
as
fish
oreven 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.
if the
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 order forthe 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 noise fromthe 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 oreven structure
from the
display. Try using resistorspark plugs
or
routing
the
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
transducer is
pointing straight
down. This is the
most common
problem
if a
partial
arch is
displayed.
See the Fish Arch section in this 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 a 0 to 60 foot
range.
This
enlarges
the
targets,
allowing
the
display
to show
much more detail.
24
Welcome to the world of
sportfishing
sonar. Your Lowrance
X-20A is
a
high quality
sonar
designed
for both
professional
and novice users.
This unit has an automatic feature
that finds and
displays
the
bottom
depth, fish,
and structure. As
you
become
familiar with
your
X-20A, you
can "fine tune" the unit to the
surrounding
conditions to
get
the most
from
your
sonar.
Although
the X-20A
has
many
features and
functions,
the
simple key-
board and
operation
modes makes it
easy
to
use and understand.
Read this manual
and take it with
you
when
you
use
this unit. it makes
a
great
reference should
you
need it. The more
you
know when
you get
to
the
water,
the more
your
X-20A can do for
you!
INSTALLATION
Mounting
install the unit in
any
convenient
location,
provided
there is clearance
when tilted
for the best
viewing angie.
Holes
in the bracket base allow
wood screw
or
through
bolt
mounting.
Place a
piece
of
plywood
on the
back of thin
panels
to secure the
mounting
hardware. Make certain
there is
enough
room behind the unit to
attach the
power
and
transducer
cables.
You can route
the
power
and transducer cables
through
a one inch hole
in the
mounting
surface.
First
pass
the transducer
connector and cable
up through
the hole. Then
push
the
power
cable
wire down
through
it.
After
routing
the
cables,
fill the hole with silicone rubber
adhesive
(RTV).
Offset
the bracket to cover the hole. Route the
cables
through
the slot in the rear of the
bracket. There are two notches
in the bracket
that can be
punched
out for
more
cables,
if
necessary.
NOTCIII
1
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