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Lowrance X-1550 Manual

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I INTRODUCTION example,
with the LOWER LIMIT
transmitter
pulse
width is
selected,
The Lowrance X-1550 is a
highly sophisticated recording
depth
sounder. Thanks to a mic-
rocomputer,
the X-1 550 can do
more than
any
other
depth
soun-
der in its
price range.
Full control
of the
system
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,
suppression
level,
depth range,
paper speed,
and the
degree
of
"Gray
Line".used
to
enhance the
recorded information: The
pat-
ented Lowrance variable
suppres-
sion
system
not
only
filters out
false
signals
without
distorting
the
real
ones,
but is
synchronized
with
the
gray
line
function to
pro-
vide clear
signals
under all condi-
tions. The
permanent
record of
what
your
sonar has "seen" is
rolled 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-1 550
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.
set to 260
feet,
the initial
transmit
pulse
width
would be
260
ts.
If
the LOWER LIMIT is set to
390
feet,
the initial transmit
pulse
would be 390
Its. Finally,
from 600
feet and
below,
the
initial
pulse
width
remains at
600
micro-seconds.
The
transmitter
pulse
width can
be increased from the initial
point
at
any
time
by rotating
the
Sup-
pressor
control clockwise. The
maximum
amount of
pulse
width
added to the initial transmitter
pulse
width is
approximately
800
microseconds. In other
words,
if
the LOWER LIMIT is set to 420
feet,
and the
Suppressor
con-
trol is rotated to the maximum
pos-
ition,
the transmitter
pulse
width
would be 1220 micro-seconds.
(420
initial
+
800
=
1220.)
Earlier,
we talked about the rela-
tionship
between
pulse
width
and
target separation.
As
pulse
width
increases,
target separation
or
resolution is
degraded.
However,
if
the
pulse
width
is
decreased,
resolution becomes much
better.
The X-1550 allows
you
to take
advantage
of this fact
by making
it
possible
to override the initial
transmitter
pulse
width
selling
from what the
micro-computer
selects
according
to the Lower
Limit.
The initial transmitter
pulse
width can be set from 30
ps
to
2000
jis
by entering
it on the
keyboard
as shown below.
No other
graph
in
the market
today
can
give
you
this feature.
After
setting
the initial transmitter
pulse
width,
the
suppressor
con-
trol can
still be used to cancel out
noise
by increasing
the
pulse
width.
For
example,
if a 50
ts
initial
and the
Suppressor
control is ro-
tated to
maximum,
the transmitter
pulse
width would be 850
j's.
Re-
turning
the
Suppressor
control to
minimum will restore the unit to a
50
/.ts
transmitter
pulse
width.
The X-1550 will
display
the initial
transmitter
pulse
width at the bot-
tom of the
paper
when
you
over-
ride the
micro-computer.
To distin-
guish
the initial transmitter
pulse.
width from the
depth
scale
printed
on the
paper,
a zero is
printed
in
front of the
pulse
width so that the
two will not be confused. For
example,
a 100
j's
transmitter
pulse
width will be
displayed
on
the
paper
as 0100. A 50
Its
transmitter
pulse
width would be
displayed
as
0050,
while a
50-foot
depth
will be
displayed
as 50. To
set the initial transmitter
pulse
width,
simply press
the amount of
pulse
width desired on the
keyboard,
and then
press
both the
LINES and SCALES
keys
at the
same time.
(Note:
If the lines
and/or the scales were turned
off,
this will turn them back on. To turn
them back off
again, press
either
the SCALES
key
or the LINES
key
independently.
Do not
press
them
simultaneously.)
This will override the micro-
computer's
selection and set the
initial transmitter
pulse
width to the
desired
setting. (Note:
When an
initial transmit
pulse
width is
set,
this width will be
fixed for all
depth
settings
until
changed
or until con-
trol is returned
to the micro-
computer.)
To return the unit to the control
of the
micro-computer, simply
press
0 and then the LINES and
SCALES
keys
at the same time.
This will
revert the
unit
back to
normal
operation.
Figure
1
Fish: 17 ft.
Depth:
35 Ft.
TRULINE RECORDER BOTH SEND AND
RECEIVES SIGNALS.
RECEIVED SIGNALS ARE INDICATED ON
GRAPH PAPER.
2 19
PDF compression, OCR, web-optimization with CVISION's PdfCompressor
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