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The
Discrimination feature on Lowrance sonar units removes
many
false
signals
from other
sonars,
acoustic and electrical
sources,
and
more.
FISH ALARM
-
An alarm that activates
when a fish or
suspended object
is detected.
FISH ARCH
-
A sonar with
good
resolution and definition can
display
suspended targets
as
upside
down "Vees" or arches. These
signals
are
typically
fish,
hence the name "Fish Arch". See
page
20
for more
information.
FLUSH MOUNT
-
A transducer that is installed with the bottom of the
transducer
flush with the bottom of the hull.
GIMBAL BRACKET
-
A bracket
used to install a sonar unit
perma-
nently.
The sonar unit can
rotate in the bracket for the best
viewing
angle.
GRAYLINE Thi feature shows the
relative
strength
of
signals
dis-
played
on the screen.
Signals
weaker than
the GRAYLINE
setting
are
displayed
in
black,
stronger targets
are
gray.
It also
gives
clues to the
composftion
of the bottom.
In other
words,
you
can tell if the bottom is
soft or hard. A hard bottom returns
a
strong signal causing
a
wide
gray
line.
A
soft,
muddy
or
weedy
bottom returns a weaker
signal
which is
emphasized
with
a
narrow
gray
line.
IN-DASH
-
A sonar unit
installed
through
a hole in the boat's dash.
Usually,
the face of the sonar is flush
or
nearly
so with the dash.
kHz
-
Kilohertz. A measurement of
frequency.
Your Lowrance sonar
operates
at 192 Kilohertz.
(192,000 cycles per
second).
LCD
-
Liquid crystal display.
The screen or
display
of a
Liquid Crystal
Graph
sonar
instrument.
LCG
-
Liquid Crystal Graph.
NOISE
-
Any
undesired
signal.
Electrical noise is caused
by
engine
ignitions systems, radios,
etc. Acoustic noise is caused
by
the
vibration
of the
engine
or other mechanical
sources. Noise
appears
on the
display
as random
dots or lines.
NOISE
Minimize electrical noise
by
routing
the
power
cable
away
from
other
possible
sources of electrical interference.
One of the
largest
noise
generators
is the
engine's
wiring
harness that runs from the
engine
to
the instrument
panel.
This harness
usually
contains a wire for the
tachometer which radiates RF
(radio
frequency) energy.
For best
results, keep
the
power
and transducer
cables
away
from the
engine
wiring.
Also, bilge pump wiring
can sometimes
radiate noise so
try
to
keep
the X-20's
cables
away
from those wires.
VHF radio
antenna cables
typically
radiate
RF
energy
at
higher power
levels than the
engine's wiring
harness. It is
important
to
keep
the X-
20's
power
and transducer cables as far
away
as
possible
from VHF
radio cables.
If interference
begins
at slow boat
speeds,
worsening
as the boat
speed
increases,
then a
probable
cause is acoustic
noise,
or cavitation.
This
noise is not
electrical,
but
rather
mechanically
induced
noise from the
transducer.
Stop
the
boat,
put
the
engine
in
neutral,
and increase
the
Rpm.
If the noise does not
increase on the
display,
then it is cavitation.
Usually,
air bubbles
passing
over the face of the transducer
create
acoustic noise. The faster a boat travels,
the more air bubbles increase
and
generate
noise on the
display.
To eliminate this
problem,
read the
transducer
installation section
for
proper mounting techniques.
TRANSDUCER
Transducer installation
instructions are
packaged separately
with the
transducer. Please read the
instructions
carefully
before
you
install the
transducer.
Periodically
wash the transducer's
face with
soap
and water to remove
any
oil film that
may
collect. Oil and
dirt on the face will reduce the
sensitivity
or
may
even
prevent operation.
Paint transducers
on salt water boats with a thin
coat of anti-foulant
paint
to
prevent
organisms
from
growing.
If
unchecked,
barnacles and
other marine
growth
will cause a decrease
in
the transducer's
sensitiv-
ity.
Do not use
a metal based anti-foulant
paint
as it
will decrease the
transducer's
sensitivity.
There are
special
anti-foulant
paints specifi-
cally designed
for transducers.
They're readily
available
at most marine
dealers
26
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