GLOSSARY
ANCHOR WATCH -
A
selling
of the sonar unit's
alarm. The alarm activates
when the boat drifts
into shallower or deeper
water than the alarm set
points.
BACKLIGHTEDAdisplayorkeyboardillUminatedfrombehitX1
byalight.
Back-lighted displays
and keyboards are essential
when
night fishing or
navigating.
CAVITATION -Air bubbles created
bythe high speed movement of a boat
or
transducer through
water.
CHART SPEED -(1) The speed of the chart paper on a paper graph
recorder. (2)
The
speed of an image
across the screen of a liquid crystal
graph. (Also
called "scroll
speed").
CONE ANGLE
-Width of the transducer's cone
of sound. Lowrance has
transducerswith
coneanglesfrom 8to45degreesto
suitthevarying
needs
of fishermen.
CRT
-
Abbreviation for Cathode Ray
Tube. See Video
Graph.
DEFINITION -
The
ability
of a sonar unit's
display
to show detail. A
high
resolution display
can show more detail
than a low resolution one.
DISCRIMINATION -
A feature
thatallows the sonar to eliminate noise and
display onlytrue target
information. Discrimination on
Lowrance products
cuts out false
signals
from other sonar, noise, thermoclines, and more.
FISH ALARM
-
An alarm that activates
when a fish is detected.
FISH ARCH
- A sonar with good resolution displays fish
signals
with an
upsidedown
"V" orarch. This
distinguishesfish signalsfrom
othertargets.
FLUSH MOUNT -
A transom mount 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 permanently.
The sonar unit can rotate in the bracket for the best
viewing angle.
GRAYLINE -Thisfunction shows
the relative
strength of
signals displayed
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 awirefor the
tachometer
which radiates HF (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-40's cables
away
from those wires.
VHF radio antenna cables radiate
RF
energy
at
higher power
levels
than even
the
engine's wiring harness. It is
important
to
keep
the X-40'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 overtheface of thetransducer
createacoustic
noise. Thefasteraboattravets, the moreair bubbles increaseand generate
noise on the
display. To eliminate this problem, read the transducer
owner's manual for
proper
mounting techniques.
TRANSDUCER
Installation instructions for the transducer are
with the transducer
in a
separate package. Please read the instructions carefully
before
you
install the transducer.
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