Filter
Top Products
resolution.
For
example,
if a 50
ps
initial
transmitter
pulse length
is
selected,
and the
Suppressor
control is rotated to
maximum,
the
transmitter
pulse length
would be
850
ps. Returning
the
Suppressor
control to minimum will restore
the
unit to a 50
ps
transmitter
pulse
length.
The X-15A will
display
the initial
transmitter
pulse length
at the bot-
tom of the
paper
when
you
over-
ride the
micro-computer.
To
distinguish
the initial transmitter
pulse
from the other information
printed
on the
paper,
the
graph
will
print
P-100
(if
the
pulse
is set
to 100
micro-seconds.)
A 50
us
initial
pulse length
would be dis-
played
as P-SO.
To set the initial transmitter
pulse length, simply press
on the
keyboard
the initial
pulse length
desired and then
press
the
PULSE
key.
For
example,
to
set
the initial transmit
pulse length
to
150
micro-seconds,
press
1
-
5
-
0
-
PULSE. This will override the
micro-computer's
selection and
set the initial transmitter
pulse
length
to 150 micro-seconds.
P-iSO will be
printed
at the bottom
of the
paper
to
signify
that the en-
try
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.
Example:
Set the initial transmit
pulse length
to 100
micro-seconds.
Press:
1
-
0
-
0
-
PULSE
Result:
---—-bO-—-F-ILU
-•-—--
Figure
39
Discrimination
Noise
pulses
are
the
largest
complaint
most often received
about sonar
units. Lowrance has
had the
patented
Suppression
system
for
many years
which is
quite
effective at
eliminating
noise
from the
display.
(See
Transmit
Pulse
Width.)
The
only
drawback
to the
Suppression
system
is that
it increases the
transmitter's
pulse
length
which decreases
resolution
and causes
targets
that are close
together
to
merge
into
one "blob"
instead of
two distinct
images.
Discrimination is a
program
installed in the X-15A's
micro-processor
that
enables
it
to
process
the
output
from the re-
ceiver,
determine which
signals
are noise and eliminate
them,
then
print only
the
legitimate
echoes.
Using
this
concept,
the transmit-
ted
pulse
does not have to be
increased,
therefore records with
high
resolution and
high
noise im-
munity
can be achieved.
(The Suppressor
Control
may
be used with the Discrimination to
cancel OUT
heavy
interference or
noise whenever
high
resolution is
not
required.)
There are four levels of Dis-
crimination that can be used. The
lowest value
(1)
is the weakest
SPECIFICATIONS
—
X-15A
Depth Ranges:
Feet, fathoms,
meters.
Operating Frequency:
192 kHz
(192,000 cycles per
second); accuracy
is within 0.6
percent.
Pulse
Length:
(duration
of
pulse):
200-l000ps
(30-2000gs programable)
Operating Voltage:
Minimum: 10 volts DC
Maximum: 15 volts DC
Operating
Current:
0.7 to 1.8
amps depending
on
printing density
and
output
power.
Output
Power:
1600 watts
typical peak-to-peak.
(200
watts
RMS)
Weight:
8.5 lb.
(3.9 Kg)
Dimension:
With Gimbal Mount:
Width
-
12¼"
Height
-
9"
Depth
-
6%"
Instrument
Only:
Width
-
101/4"
Height
-
8¼"
Depth
-
6%"
NOTICE
Periodically
wash the Trans-
ducer Face with
soap
and
water
to remove
any
oil
film that
may
collect Oil and dirt on the face
will reduce
sensitivity
or
may
even
prevent sounding.
GOT A PROBLEM? LET US
HELP!
If
you
have a
problem
with
your
sonar
unit,
please give
us a
chance to
help
before
sending
it in
for
repair.
Assistance can often be ex-
tended
by telephone
or letter.
Write or call one of our Authorized
Service Centers or the Lowrance
Electronics, Inc.,
Customer Ser-
vice
Department
in
Tulsa,
OK.
(Toil-free 1-800-331-3889).
Please detail the
problem you
are
experiencing.
Our Service De-
partment may
be able to save
you
the inconvenience of
returning
your
unit.
If
it is determined that
your
unit
must be
returned,
full
shipping
in-
structions will be
provided.
SCHEMATIC DIAGRAM AND
PARTS LIST
Should
you
desire a Schematic
Diagram
and
Parts list for
your
Lowrance TRUELINE RECORD-
ER,
send
$1.00
to PARTS
LIST,
Lowrance
Electronics, Inc.,
12000
East
Skelly
Drive, Tulsa,
Okla-
homa 74128. Be sure and
give
us
the Model Number and Serial
Number of
your
SONAR
INSTRUMENT
—
Ia—-—
—•---••-—- —.
2L1---——.-—
———-
29-—-
20
NOTE: This sonar uses LPG -605 Chart
Paper.
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