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AUTO
When the horizontal bar reaches the far
right
hand side of the
screen,
the
sensitivity
level is at maximum.
With
high
sensitMty settings,
a second bottom
echo
(second echo) may appear.
This is normal. It's
caused
by
the
returning signal reflecting
off
the surface of the water. Then
it makes
a second
trip
to the bottom and back
again.
To turn Auto
SensitMty
back
on,
press
the AUTO
key.
Remember,
pressing
the
AUTO
key
turns both automatic
sensitivity
and
auto
ranging
functions on and off at
the same time.
AUTO SENSITIVITY ADVANCED
OPERATION
When the X-40 is in the automatic
mode,
the receiver's
sensitivity
automatically adjuststo
the
surrounding
conditions. The
micro-computer
places
itatalevel
slightlyabovethe
minimum
requiredto pickupthe
bottom
signal.
Changing
the
sensitivity
level while the X-40 is
in the automatic
rnodeis
possible.
This
may
be desirable if the
sensitivitylevel
is not
enough
to show fish
or other small detail. The X-40 will increase
the
sensitivity
to
28
9
Brush
usually
lies on
the bottom and shows
up
as
clumps rising
abovethe bottom
signal.
Brush
signals
look similarto
large
rocks,
however
their
signal
is not as
strong
as rock.
FISH SIGNALS
The
signals displayed
on the X-40
by
fish are
identified
by
various
shaped markings
in
certain
patterns,
as
opposed
to random
marks created
by
noise. Or the
solid,
continuous
markings
made
by
the bottom.
Typically,
fish are
identified
by
a characteristic arch
that
separates
them from their
stationary surroundings.
The reason
for this is shown
below. The distance
to a fish when it moves into the sonar's
cone of sound
isshownas "A" below. Whenthefishhas
moved intothe
centerofthecone,
the distance to it
will
be
shorter,
"B". As it moves out of
the
cone,
the
distance will Increase
again
as
shown In "C".
8C
SENSITIVITY:
TOO LOW
SENSITIVITY:
PROPER
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11


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