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.
Introduction
How
It Works
Installation
Transducer
Selection
Basic
Operation
Suppressor
Paper Speed
GRAYLINE®
Range
Lower Limit
Upper
Limit
Lines...,
.•..
Marker
.
Scale
End Of
Paper
:
Zero
Adjust
How To
Read
Graphs
Pape Loading
Stylus Replacement
Stylus
Belt
Replacement..
Do's and
Dont's
Troubleshooting
Advanced
Operation
level
whereas the
highest
value
(4)
is
the
strongest
level and
should be used
only
when
severe.
noise is
present.
To use
the Discrimination
func-
tion,
simply press
the level
of
noise
rejection
deeired,
from 1 to
4,
then
press the
DISC
(Discrimi-
nation)
Key.
There should
be an
immediate
change
in the
amount
of noise
present
on the
paper.
The
Discrimination
setting
is
printed
at
the
bottom of the
paper
each time
the level is
entered
and at inter-
vals
thereafter.
The Discrimination
function can
be
disabled at
any
time
by press-
ing
0
-
DISC.
Example:
Enter a
Discrimination
level of
2.
Press: 2
-
DISC
Result:
Transmit
and Print
Alternate
When
using
the
X-1 5B in
deep
water-or if
you
wish to
simply
con-
serve
paper,
it
may
be
desirable to
slow the
paper speed
even more
than the
automatic
system
allows.
However,
when
doing so, you
may
get
over
print"
or
very dark,
heavy
printing
over an
area that is
difficylt
to read.
Much detail can
also be lost due
to this.
A feature that
is available on
the
X-15B is the
Transmit and
Print
Alternate function
which,
when
activated,
causes
the
stylus
to
print
every
other
revolution in-
stead of
every
revolution. This
accomplishes
four
things:
1.
Since the
stylus
only prints
every
other
revolution,
the
recorded
information doesn't
have the
over
print"
problem,
therefore
good
records are
attainable, at slower
paper
speeds. Also,
the scale num-
bers are
spread
out
more,
mak-
ing
them
more
legible.
2. Reduces
the
possibility
of
"wrap-around".
This is the un-
desirable
occurrence of the
second or
third bottom echo
printed
on the
paper
at
the
top
or middle
of the
page.
Many
times this
can interfere
with fish
or
other
targets
that
you
wish
to see.
3. Reduces the
reverberation ef-
fect. This
happens
mainly
on
lower
frequency units,
but it
can
happen
on
higher
fre-
quency
models.
Reverberation
is
heavy,
scattered
noise marks
caused
by
the
transmitted
sig-
nal
becoming trapped
between
the
surface and the
bottom,
usually
scattered
in
heavy
plankton
layers
or
baitfish
schools. This
causes a
great
many
lines to be
printed
on
the
page. By
enabling
the
Transmit
and Print
function,
the
transmit-
ter is
triggered
only
half as
many
times
as
normal,
putting
less
energy
into the water
(same
amount of
power, just
not as
often)
which reduces
the
amount of noise
seen.
4.
Slows the
paper
speed.
A
sig-
nificant
amount of
paper
can
be
saved
by
using
the Alter-
nate
Transmit and
Print feature.
21
INDEX
Specifications
2
2
3
4
4
5
6
7
7
7
8
9
9
9
10
10
10
11
14
15
16
16
..
..17
Surface
Clarity
Control
(SCC)
17
Feet, Fathoms, Meters
18
Transmitter
Pulse Width
18
Discrimination
20
Transmit and
Print Alternate
21
2-———
-—
——-
2
-
2'l
——
-—
b0-—-t2
0 50
0-2—
Figure
40
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