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resolution.
For
example,
if a 50
Its
initial
transmitter
pulse length
is
selected,
and the
Suppressor
control is rotated
to
maximum,
the
transmitter
pulse length
would be
850 is.
Returning
the
Suppressor
control to
minimum will restore the
unit to a 50
' transmitter
pulse
length.
The X-15B
will
display
the initial
transmitter
pulse length
at the bot-
tom of the
paper
when
you
ovei-
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
Its
initial
pulse
length
would
be dis-
played
as
P-SD.
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
thelnitial
pulse
lenth.
Example:
Set the
initial transmit
pulse length
to 100
mipro-secqnds..
Press; 1 -0- 0
-
PULSE
Result:
2—
2'i
———
•——..-..
—-———2b
Nfl
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
image
Discrimination is a
program
installed in the X-lSBs
micro-processor
that
enables it to
process
the
output
from
the e-
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,
thsrefpre records with
high
resolution and
high
noise
irri-
munity
can be
achieved.
(The Suppressor
Control
may
be
used
wth
the Discrimination to
cancel OUT
heavy
interference
er
noiSe
whenever
high
resolution is
not
requfred.)
There are four leyets of
Dis-
crimination that can be
used. The
lowest value
(1)
is the weakest
20
SPECIFICATIONS
—
X-15 B
Depth Ranges:
Feet, fathoms,
meters.
Operating Frequency:
192 kHz
(192,000 cycles per
second); accuracy
is within 0.6
percent.
Pulse
Length:
(duration
of
pplse):
200-i
000p.s
(30-2000jis 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
-
121/4"
Height
-
8%"
Depth
-
51/4"
Instrument
Only:
Width
-
91/2"
Height
-
71/2"
Depth
-
5¼"
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
mey
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.
Call
(918)
234-1452.
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.
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