11/Vs
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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