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keyboard
the initial
pulse length
desired and then
press
the PULSE
key.
For
example,
to set the initial
transmit
pulse length
to 1 00 micro-
seconds,
press
1
-
0
-
0
-
PULSE.
This will override the micro-com-
puter's
selection and set the initial
transmitter
pulse length
to 100
micro-seconds. P
=
100 will be
printed
at the bottom of the
paper
to
signify
that
the
entry
has been
confirmed.
(Note:
When an initial
transmit
pulse length
is
set,
this
length
will be fixed for all
depth
settings
until
changed.)
To return
control back to the
micro-computer, press
0
-
PULSE
and the
micro-computer
will select
the initial
pulse length.
ALTERNATE
TRANSMIT AND
PRINT
When
using
the X-16 in
deep
water,
or if
you
wish to
simply
conserve
paper,
it
may
be desir-
able
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 difficult to read. Much detail
can also be lost due to this.
A feature that is available on the
X-16 is the Alternate Transmit and
Print function
which,
when acti-
vated,
causes the
stylus
to
print
every
other revolution instead of
every
revolution. This accom-
plishes
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 numbers are
spread
out
more, making
them more
legible.
2. Reduces the
possibility
of
24
"wrap-around".
This is the undesir-
able occurrence of the second or
third bottom echo
printed
on the
paper
at the
top
or middle of the
page. Many
times this can inter-
fere with fish or other
targets
that
you
wish to see.
3. Reduces the reverberation
effect. This
happens mainly
on
lower
frequency
units,
but it can
happen
on
higher frequency
mod-
els. Reverberation is
heavy,
scattered noise marks caused
by
the transmitted
signal 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 transmitter is
trig-
gered only
half as
many
times as
normal, puffing
less
energy
into
the water
(same
amount of trans-
miller
power, just
not as
often)
which reduces the amount of
noise seen.
4. Divides the
paper speed by
two. A
significant
amount of
paper
can be saved
by using
the Alter-
nate Transmit and Print feature.
To turn this feature
on,
simply
press
the 2nd
key,
then
press
the
"4"
key.
The
paper speed
will
immediately
slow
down,
signifying
that the function is enabled.
To turn the Alternate Transmit
and Print feature
off,
simply press
the 2nd
key
and then
press
the
"7"
key.
The
paper speed
will
immediately speed up, signifying
that the function has been turned
off.
PAPER SAVE
Although
the Alternate
Transmit
and Print
function will slow the
paper speed,
the
Paper
Save
function
is an even more
powerful
Thus,
you
would use a
20
degree
transducer
when
looking
for fish
or
strubture,
to
easily
find
drop-offs
or
reefs,
and to see fish
that are
around
you
. . . not
just
below
you.
However,
the
20
degree
transducer won't
penetrate
to
greater
depths
as well
as the 8
degree
transducer,
nor will it show
a
sharp
drop-off
as well. In
a
deep-water
environment
(100
feet
or
deeper)
or where
you're
looking
at
sharp
drop-offs,
the narrow
cone
angle
can sometimes be
more desirable because it can
more
accurately
detect the loca-
tion of the
drop-off
without
displaying
the fish. In
deep
water,
with the sound
energy being
con-
centrated in a smaller
area,
the 8
degree
transducer can reach to
greater depths.
Both the 8
degree
and the 20
degree
transducers
give
accurate
bottom
readings,
even
though
the
bottom
signal
is much wider on
the 20
degree
model because
you
are
seeing
more of the bottom.
Remember,
the shallow
edge
of
the
signal
shows
you
the true
depth.
The rest of the
signal
tells
you
whether
you
are over
rocks,
mud,
dropoffs,
etc.
Thanks to the LSB-200A trans-
ducer switch
box,
you
can have
the best of both worlds.
By
install-
ing
the LSB-200A near the
operator,
both a 20
degree
and an
8
degree
cone
angle
transducer
may
be mounted on a boat and
connected to the switch box. A
cable from the switch box is
then
connected to the X-16. Now
either transducer
may
be used
as
conditions dictate. Use the 20
degree
transducer when
in
shal-
low to medium
depths
and then
switch to the 8
degree
transducer
5
when in
deep
water or when
you
need
just navigation
information.
Salt water boats need to have
the transducer
painted
with a thin
coat of anti-foulant
paint
to
prevent
organisms
from
growing.
If un-
checked,
barnacles and other
marine
growth
will cause a
decrease in the transducer's sen-
sitivity.
Do not use a metal based
anti-foulant
paint
as it will de-
crease the transducers
sensitivity
also.
There are
special paints
on
the market
specifically designed
for transducers and are carried
by
most marine dealers.
BASIC OPERATION
On-Off and
Sensitivity
Control
—
Rotate the
Sensitivity
knob
clockwise to turn the unit on. The
Sensitivity
knob works much like
the volume control on a
radio,
that
is,
weaker
signals
will be detected
with
higher settings
of
the knob.
When
cruising,
or at other times
when
just simple
bottom
contour
information is
desired,
the Sen-
sitivity setting
can be low.
In
deep
water or over
soft,
muddy
bottoms,
(which produce
weak
echoes),
the
setting
will have to be
higher.
When
high Sensitivity settings
are
used,
a second bottom echo
will
appear.
This is normal and is
caused
by
the
returning signal
reflecting
off the surface of the
water,
making
a second
trip
to the
bottom and back.
If detailed information about
brush
piles,
individual
fish,
or the
thermocline is
desired,
the Sen-
sitivity
knob should be rotated to
approximately
the ¾
point.
Refer
to the illustrations on
page
6 to
see what effect the
Sensitivity
control
setting
has
on the recorded
information.
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