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selected,
the transmit
pulse length
would be: 525 + 200
=
725
micro-seconds. We added the ini-
tial transmit
pulse
of 525 micro-
seconds which is listed
in the
initial transmit
pulse
chart,
to 200
micro-seconds,
which
is
Sup-
pressor
level
3,
according
to the
Discrimination
-
Suppressor
chart.
So the total
initial transmit
pulse
length
is 725 micro-seconds.
Now,
if we
want,
we can increase the
PAPER SPEED CONTROL
This
key adjusts
the
speed
of
the chart
paper.
Its
range
is 0 to 7.
When
the X-16 is first turned
on,
the
paper speed
is set to level 5.
This
setting
is
good
for detailed
graphs,
in shallow to medium
depths
when
trolling.
It
will show
proper
fish arches at
low
speeds
and
keeps high speed
information from
being
com-
pressed.
The
paper speed
should
be turned down when
using
the
unit in
deep
water. This will
pre-
vent
gaps
from
appearing
in the
record.
In
fact,
the
microcomputer
will
automatically
slow the max-
imum
speed
of the chart
paper
when
operating
in
deep
water.
To
change
the
speed
of the
chart
paper, simply press
the new
level
desired,
from 0 to
7,
then
press
the
PAPER
SPEED
key.
The
paper speed
should
change
immediately.
Remember,
if
gaps
in the record
appear,
turn the
paper
speed
down
until a solid record is
achieved. The
paper speed may
also be
slowed
when not
looking
for fish or to
simply
conserve
paper.
If
heavy printing,
or "over-
strike"
occurs,
turn the
paper
speed
up.
Overstrike
happens
when the
paper
moves too slow
past
the
stylus,
which causes the
stylus
to
print
over a
large portion
of the
previous
mark. This makes
heavy,
black marks on the chart
paper. Usually,
the easiest
way
to
solve this
problem
is to turn the
paper speed up.
However,
Alter-
nate Transmit and Print or the
Paper
Save function listed in the
Advanced
Operation
section in this
manual,
may help
also.
GRAYLINE CONTROL
The GRAYLINE function can be
SUPPRESSOR LEVEL INITIAL TRANSMIT PULSE INCREASE
(micro-seconds)
0 AUTOMATIC
1 0
2 100
3 200
4 330
5 450
6 600
7 800
the
digital
shows
up
on the
X-16
•
(random
short lines
running
ver-
tically
across the
paper),
then
increase
the
Discrimination level
until
they
are
gone.
To use the Discrimination func-
tion, simply press
the level of
noise
rejection
desired,
from 0 to
4,
then the
Disc
(Discrimination)
key.
There should be an
immedi-
ate
change
in the amount of noise
present
on the
paper.
The
Discrim-
ination
setting
is
printed
at the
bottom of the
paper
each time the
level is entered and at intervals
thereafter. When
the X-16 is
shipped
from the
factory,
the Dis-
crimination level is set to 1.
The Discrimination function can
be disabled at
any
time
by press-
ingO-DISC.
Example:
Enter a Discrimination
level of
4.
IF INITIAL TRANSMIT PULSE
LENGTH IS LESS THAN 500 MICRO-
SECONDS:
DISCRIMINATION LEVEL
SUPPRESSOR LEVEL
0
1
1
2 2
3
3
4 4
IF INITIAL TRANSMIT PULSE LENGTH
IS GREATER THAN 500
MICRO- SECONDS:
DISCRIMINATION LEVEL SUPPRESSOR LEVEL
0
1
1
2
2 3
3
4
4 5
FIGURE 7
----0.0--—
is
automatically
increased when
the Discrimination level is
increased. This is done for better
noise
rejection.
The
following
chart
shows the
relationship
between
Suppression
and Discrimination.
Remember,
Suppressor
value 1
adds
nothing
to the initial transmit
pulse length.
In other
words,
if the
lower limit
selected was 525 feet and a
Discrimination level of
2 was
PRESS:
4
-
DISC FIGURE 8
—nfl ———-— — — — ——__________
-
12.0
•
12.0
24.0
fl'
--
•
' •
-•
48,0
22 7
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