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I
INTRODUCTION
The
Lowrance X-15 is a
highly
sophisticated
recording depth
sounder.
Thanks to a microcom-
puter,
the
X-15 can do more than
any
other
depth
sounder in its
price range.
Full control of the
sys-
tem is at
your
finger tips
to meet
the
changing
demands of
varying
bottom
conditions,
water
depth
and boat
speed.
You can select
the unit's
sensitivity setting, sup-
pression level,
depth range, paper
speed,
and
the
degree
of
gray
line" used to
enhance the re-
corded information.
The
patented
Lowrance
variable
suppression
system
not
only
filters out false
signals
without
distorting
the real
ones,
but is
synchronized
with the
gray
line function to
provide
clear
signals
under all
conditions. The
permanent
record of what
your
sonar
has "seen" is
roiled and
stored inside the case.
Small boat sonar
systems
are
routinely
used to
measure water
depth,
examine bottom
contours,
and locate fish. The
capability
of
the
X-15
goes
far
beyond
the
ordinary.
Clues to
the
composition
of the bottom are
given
schools
of bait fish are
easily distinguished
from
solitary game
fish
there is
a continuous
display
of
information
about bottom
contours and sub-
merged shipwrecks
fish closer
together
than six
inches can be
shown
separately
concentra-
tions of
algae,
moss or
plankton
can be identified
at
trolling
speeds
individual fish are
com-
monly
recorded with
a characteris-
tic "arched"
signature
which
dis-
tinguishes
them from their sur-
roundings
layers
of water
with
different
temperatures
can be de-
tected under
good conditions,
and
vertical
movement of
fish,
(up
or
down),
can
be shown.
HOW IT WORKS
When the unit
is turned
on,
an
electronically
regulated
motor
drives a
lightweight
belt located at
the
right edge
of the
recording
paper.
The
marking stylus
is at-
tached to this
belt. When the
stylus
is at
the
top
of the
paper
a
small mark is made.
This is called
the zero
mark,
and
represents
the
surface of the
water.
High Speed
(46 M.F.H.)
SUPPRESSION: OFF
SENSITIVITY: ON 1/2 POSITION
t - -
I,
1
NOTE POOR
RECORD CAUSED
Figure
44
BY NOT USING
SUPPRESSION
WHEN AT HIGH
SPEED.
-
-
a -
-i —,_.—,,
t''.'9ø'a't
I,.'
High Speed (46 MPH.)
Figure
45
SUPPRESSION: ON
ADEQUATE SElliNG
SENSITIVITY: ON
1/2 POSITION
s
RANGE: 50 TO 70 FEET
SENSITIVITY:
3/4
Figure
46
PULSE WIDTH: 100
MICRO-SECONDS LINES: OFF
SUPPRESSOR: MINIMUM
PAPER SPEED:
MAXIMUM
23
Figure
1
Fith 17 ft.
Depth
35 ft.
2
TRULINE RECORDER BOTH SEND AND
RECEIVES
SIGNALS.
RECEIVED SIGNALS ARE
INDICATED ON GRAPH
PAPER.
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