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19
LIGHT
LIGHT
A
light
is
provided
for
operation
of the X-3 at
night.
When the unit is first
turned
on,
the
lights
will flash for 6 seconds. Press the
2nd-9
keys
and
the
lights
will
stay
on. To
turn the
lights
off,
press
the 2nd-9
keys.
The
lights
will also
go
off
when the X-3 is turned off.
DISCRIMINATION
Noise is
quite
often the
biggest complaint
fishermen
have about their
sonar units. Noise is
any
undesired
signal
and it can be
caused either
by
an electrical or acoustic
source,
or a combination of
the two. In both
cases,
the noise can
produce
unwanted marks on the
display.
DISCRIMINATION
OFF(O)
The
Discrimination feature on the X-3
processes
all
incoming
echoes
from the
receiver,
determines which ones are noise and
eliminates
them,
then
displays only
the
legitimate
echoes. Discrimination
has two levels—
1,
and 2. 0 is
"off",
2
is the
highest setting.
When the X-3 is turned
on,
the
Discrimination level is
automatically
set to 1. If noise is
present
on
the
display, press
the level
of Discrimination
desired,
(0,
I,
and
2)
then the
DISC
key.
There should be
an immediate
change
in the amount of noise
displayed.
ADVANCED
OPERATION
14)
HIGH SPEED SCROLL
HI
If
there is much noise on the
screen,
or when
travelling
at
high speeds,
the
High Speed
Scroll mode
may
be effective in
showing targets
such
as
fish. When this feature is turned
on,
all
targets
(including
the bottom
sig-
nal)
will
be scrolled
extremely
fast across
the screen. Noise will still be
displayed
as
single
dots,
however true
target
echoes such as fish will be
displayed
as
very long
lines that will stretch
out across the screen. This
separates
the
fish from the noise.
Random dots are noise. Fish are
long
lines that
may
or
may
not arch.
To turn on
HIGH SPEED
SCROLL,
press
2nd-4.
To turn off HIGH SPEED
SCROLL,
press
2nd-4
again.
It is
important
to note when the HIGH SPEED
SCROLL is
enabled,
auto
sensitivity,
auto
ranging,
and the
digital
(including
the
digital alarm)
will
be
turned off. When the HIGH SPEED SCROLL
is turned
off,
these functions
will still
be off.
17
18
24———
•
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DISCRIMINATION
LEVEL
Figure
14
innimuu
n
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AUTO.
RANG! NO
Figure
15
Figure
16
HIGH SPEED
SCROLL HIGH SPEED SCROLL
OFF
ON
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