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MUD BOTTOM CAUSES
THE SIGNAL TO FADE
When
you
are hunt-
ing fish,
with the
gain
adjusted properly
to
return a
clear, bright
signal
from a bottom
of
gravel, sand,
or
shell, you
will some-
times see the
signal
disappear.
This doesn't
mean that
you
have
suddenly
come to ex-
tremely deep
water
—
the dial would have
shown the
drop-off
with a wide band of
signals
in this case.
Instead,
your
boat is
now above a mud bot-
tom. Mud absorbs the
sound waves. Thrn
up
the
gain.
The bottom
signal may
be faint
from a bottom of de-
caying vegetation
under
deep
water. Fish
will still show on the
dial,
however. Back
over a hard
bottom,
you'll get multiple
signals.
Fig.
17
the
mounting
holes at the
top
of the slots
in the bracket.
6. Mount
the
assembly
to the
transom with two #10 screws.
Align
the face of the trans-
ducer with
the bottom of the
hull with a
straight edge.
Tighten
all screws.
7. Route the
transducer cable to
the
depth
sounder unit. Do
not cut the transducer cable.
If it is too
long,
coil and store
the
excess in an out-of-the-
way
location.
S. Make a
test run to determine
the results. Some boat hulls
require lowering
the back
edge
of the transducer 2° to
6°. If the run was
satisfactory,
drill
two
more holes in the
•
bottom of the slots and install
two
more #10 screws. Note:
The transducer must be
•
against
the transom for
good
results. After
locking
in
place,
fill
any
voids between the
transom and the transducer
with
caulking compound,
epoxy,
or
silicone adhesive.
OPERATION
SENSITIVITY
AND
"ON-OFF" KNOB
This knob
operates
in a manner
similar to the volume control
on
a radio.
Thrning
the knob
clockwise will
turn the unit
on,
and
turning
the knob
back the
full counterclockwise
position
will turn the unit off.
Thrning
the knob
in a continued
clockwise manner will increase
the receiver
sensitivity
and
weaker echos from
deeper
water
can and will be observed on the
dial. After
mounting
the trans-
ducer,
turn the unit on
by
turn-
ing
the
sensitivity
knob
clockwise. You will see the con-
stant surface
signal
at zero. Be-
fore
long, you
will see another
signal
—
at ten feet if the water
is ten feet
deep.
This
signal
indi-
cates the bottom.
It, too,
should
always
show.
Continue
turning
the
Sensitivity
control toward the
right
and
you
will see
a second bottom
signal
at double the
depth
of the
first,
or
20 feet. The sound waves have
hit
bottom,
bounced
back,
hit the
surface
of the
water,
then
bounced
down and
up again.
Over a firm bottom
you
can in-
crease
the
sensitivity
until the
dial shows three or four bottom
signals
at
multiples
of true
depth.
The
sensitivity
is
adjustable
and
you
should
always
set it to re-
turn a
steady
bottom
signal
—
nearly
as
bright
as the zero
sig-
nal
—
regardless
of
depth.
'Ilirn
the knob counterclockwise when
you begin
to
get
the double bot-
tom
signal;
clockwise when the
bottom
signal begins
to fade. lb
show
fish the
sensitivity
control
should be set to show a
strong,
bright
bottom
signal. Many
fishermen
prefer
to run the sen-
sitivity
control
very high
with
the second bottom
signal
show-
13
6
Mud and
decayed vegetation
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