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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