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-IL,
TRANSDUCERS AND CONE
ANGLES
The sound waves from the transducer
spread
out into the
water in a
cone
shaped
beam. This looks much
like the beam from a
flashlight.
The
angle
between the outside
edges
of the cone is the cone
angle.
Lowrance offers a choice of transducers
with either an 8 or 20
degree
cone
angle. Typically,
wide cone
angle
transducers
(20 degrees)
are
ideal for
operating
in shallow
to medium water
depths.
The
20
degree
cone
angle
allows
you
to see
more of the underwater world. In 15
feet
of water the 20
degree
cone covers an area
about six feet across. The
8
degree
transducer covers
only
about a two foot circle.
The 20
degree
transducer is almost
always
the best to use
in fresh
water,
the 8
degree mostly
in
salt
water. In a
deep
water environment,
(300
feet
-
fresh
water,
100 feet
-
salt
water)
the narrow cone
angle
is
more desirable. Since the sound
energy
is concentrated
in
a
smaller
area,
ft can
penetrate
to much
deeper
depths.
18
ZOOM
-
Manual Mode
Zoom
operates
differently
when the unit is in the
manual mode. The
range
doesn't
change
when the zoom
key
is
pressed.
Instead, press
the down arrow
key
to shift the
range
down in one
footincrements. The
up
arrow
key
shifts the
range up
in one foot increments.
For
example,
if
the unit is on the 0-60 toot
range,
and the manual
mode is
on, pressing
the zoom
key,
then the
down arrow
key
once will move
the 0-60'
range
to 1 '-61'. The best
way
to use
this feature is to
change
the
range
to a
smaller one,
then
press
the
zoom
key,
shift the
range
until the
area is
displayed
that
you
want zoomed.
For
example,
if the bottom
depth
is 50
feet,
and
you
wish to
enlarge
the area
immediately
above
it,
first
change
the
range
to 0-15 feet. Now
press
the zoom
key. Finally, press
the
down arrow
key
until the bottom
appears.
Now
you
have a fifteen
toot
zoom window around the bottom
signal.
-.
in
iLl
AUTO
F1 D
En
I
rn
DLI
DIGITAL
Built inside the X-20
is a
complete
digital
sonar. It
works
automatically
to discriminate between the valid
bottom echoes and false echoes
from
fish,
thermoclines,
or other
signals.
The
digital display
will
show
only
the bottom
depth.
At
power on,
the
digital
will
flash
"0" until it has "locked on" to
the
bottom
signal.
Once it has
acquired
the bottom
depth,
it will
display
ft
in
the lower left side of the
display.
11
MODE 5-All
chart,
High Speed
Scroll. In this mode the chart
scrolls at
high speed.
The chart
speed
can be
adjusted
with the
CHART SPEED
key
if desired.
a)
Chart
uses full screen.
b)
No
digital depth
indicator.
c)
No FASTFRAK.
d)
No automatic
operation
al-
lowed.
e)
No
Fish l.D. feature or Fish
Alarm
f)
Chart alarm is
allowed.
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