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electrical
interference,
then
attach the cable
directly
to the
battery.
OPERATING FREQUENCY
-
Frequency
of a sonar unit's transmitter
Electrical interference
shows as random dots on the
display
whenever
the
boat's
engine
or an
accessory
is on.
The
power
cable has two
wires,
red is the
positive
lead and black is
negative
or
ground.
Attach
the in-line fuse holder to the red wire on the
power
cable with the
crimp
connector. The other end of the fuse holder
attaches to the
battery
or
accessory
buss. If the cable is not
long
enough, splice ordinary
#18
gauge
wire onto it. Be certain that the fuse
holder is as close to the
power
source
(battery
or
accessory
buss)
as
possible.
This
protects
the
power
cable and
your
X-20 in the event of a
short. Use a
3-amp
fuse.
The X-20 has reverse
polarity protection.
No
damage
will occur if the
power
wires are reversed.
(However,
the unit will not work until the
wires are attached
correctly.)
and receiver.
(See kHz.)
OUTPUT POWER
-
The
amplitude
of electrical
energy
transmitted from
the sonar unit to the transducer. Measured in
wafts,
the
higher
the
output power,
the
deeper
a sonar unit can
read,
and more detail can be
displayed.
PIXEL
-
The small dots or
squares
on a
liquid crystal display
or CRT.
PIXEL DENSITY
-
The number of
pixels per square
inch on a
liquid
crystal display. Typically,
the
greater
number of vertical
pixels,
the
better the
resolution.
PULSE LENGTH
-
The amount of time that the sonar transmits.
This is
measured in
micro-seconds. The shorter the
pulse length,
the better
the resolution. For
example,
a
30 micro-second
pulse length
is
equal
to
a one
inch resolution.
RANGE
-
The section of water shown on the sonar
display.
For
example,
a 60 foot
range
has zero for the
upper
limit and 60 for the
lower limit.
REMOTE
-
An
intelligent "repeater"
unit that receives
depth
information
from another sonar unit. A remote doesn't have a transmitter or re-
ceiver.
However,
it does have it's own features that are
adiustable
and
operate separately
from the master.
RESOLUTION
-
The
ability
of a sonar unit to
separate targets
from
each other or from the bottom.
SCALE
-
The
markings
on a sonar units
display.
To determine the
depth
of a
target, simply compare
the
target's
location to the location of
the scale markers on the
display.
SECOND ECHO
-
Another echo that
registers
at
roughly
twice the
depth
of a
target
echo. This is
caused
by
the
sound waves
reflecting
off
the
bottom,
striking
the surface of the
water,
travelling
to the bottom
again,
and
returning
to the surface.
SECOND
FUNCTION
KEY
-
A
button that converts the functions
of the
primary keys
to other functions.
2 27
FUSE
12 VOLT
BATFERY
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