Specifications

GLOSSARY
NOISE
ANCHOR
WATCH -A
setting
of the sonar
unit's alarm. The alarm activates
when the boat drifts
into shallower or
deeper
water than
the alarm set
points.
BACK-LIGHTED
-
A
display
or
keyboard
illuminated from behind
by
a
light. Back-lighted
displaysand keyboardsareessentialwhefl
nightfishing
or
navigating.
CAVITATION
-
Air bubbles created
by
the
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.
Eagle
has
transducers
with cone
angles
from
8 to 45
degrees
to suit
the
varying
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 featurethat allows
the sonarto eliminate noise
and
displayonlytruetarget
information. Discrimination
on
Eagle 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
-
This function shows the relative
strength
of
signals displayed
on the screen.
Signals
weaker than the
GRAYLINE
selling
are
displayed
in
black,
stronger
targets
are
gray.
It also
gives
clues to the
compostition
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 7-7200's
cables
away
from those wires.
VHF radio antenna cables
radiate HF
energy
at
higher power
levels than even the
engine's
wiring
harness.
It is
important
to
keep
the Z-
7200'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 fastera
boattravels,
the
more air bubbles increase and
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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