Specifications

Feet. Fathoms,
Meters
long pulses,
then
the short
pulses
the section entitled Advanced
Op-
that
the
compass
readings
are
The Z-15
will
display
the
depth
in
feet, fathoms,
or meters. Al-
though
the unit
will revert back to
the feet mode
whenever
power
is
turned
off,
it is
simple
to
change
to
any
mode
you
wish
by pressing
the 2nd
key
and then 1 for
feet,
2nd
-
2 for
fathoms,
and 2nd
-
3 for meters.
When the unit is in the Feet
mode,
only
one I.!
will
be dis-
played.
In the Fathom
mode,
two
L L's
will be
displayed.
Three
Il L U
's
will be
displayed
in the
meters mode.
Example:
Display
Fathoms
Press: 2nd
-
2
Result:.
Figure
38
By
looking
at the number of
L's,
one
can determine the
depth
display
mode that the unit is
in,
i.e., Feet-,
Fathoms-,
Meters.
Transmit
Pulse Width
The noise
suppression system
in
the
Z-15
is a
patented pulse
length
discrimination
suppression
circuit,
and
is the same as the one
used on all the
Eagle's
vari-
able
supr5ression
flashers and
graphs.
Basically,
it works
on the
principle
that most noise
pulses
are of
relatively
short duration.
If
the receiver
circuit can be
ad-
justed
so
that it will
accept only
will be cancelled
out,
and
only
the
desired information
(fish,
bottom,
structure,
çtc.)
will be
displayed.
Of
course,
the
transmitter's
pulse
length
would have
to be increased
at the same time so that the re-
turn echoes would be
accepted by
the receiver.
This is
exactly
what the
Eagle
suppression system
does.
The transmitter's
pulse
length
is
increased
by
the front
panel sup-
pression
control,
and the receiver
tracks"
the amount of increased
pulse
length, cancelling
out
any
narrow noise
pulses,
and
display-
ing only
the return
echoes from
fish or the
bottom,
etc.
(Note:
Re-
ceiver
sensitivity
is not diminished
at all
by
this
process.)
The
only disadvantage
to this
system
is
resolution,
or the
ability
to
separate targets,
is diminished
when the
pulse length
is in-
creased. A 200
p-s (micro-second)
2 transmitter
pulse
length
used on
the Z-15 when
power
is first
u turned
on,
will allow the unit to
display
two fish or
targets
that are
ml
only
6 inches
apart.
In other
words,
if two fish that are 6
inches
apart
are
displayed
on the
graph
paper, they
will show
up
as two
separate
arches when the
trans-
mitter is
operating
with a 200
j.is
pulse length.
Now,
if we increase
the transmitter's
pulse length
to
400
p-s, (by rotating
the
Suppres-
sor control
clockwise)
those
same
two fish arches
will blend
together
and show
up
as one fish or
pos-
sibly
even a "blob" on the
paper.
With a 400
p-s
transmit
pulse
width,
those same two fish
will
have to be at least
12 inches
apart
before
they
will show
up
as
two
separate
arches on
the
graph.
This is
why
it is
important
to leave
eration". This
chapter
will describe
several other features that will en-
able the serious
operator
to
get
the maximum benefit from this
equipment.
We
urge you
to read this man-
ual
thoroughly
and familiarize
yourself
with the controls.
Al-
though
this is
a
very
advanced
unit,
it is
easy
to
use,
thanks to
the
power
of
the
micro-computer
and the front
panel
controls.
Should
you require
extra
help,
or
just
have a
question, please
call
our Customer Service
Department
toll free
1-800-331-2301.
(Okla-
homa
residents
call collect
-
1-918-266-5373.)
or Check the en-
closed list for a service
center in
your
area. A
representative
will be
happy
to
help you.
II
INSTALLATION
Mounting
—
The
depth
sounder
may
be in-
stalled in
any
convenient
area,
provided
the unit can be tilted for
the best
viewing
angle.
Holes in
the bracket base
allow wood
screw or bolt
mounting.
A wood
stiffener
may
be
required
on the
back of thin
fiberglass panels
to
support
the unit.
If the desired
location is closer
than
18" to a
magnetic compass,
a trial
run should be made with
the unit
in
operation
to be sure
not affected.
Power Connections
—
Twelve
volt DC
power
for
the
depth
sounder should be
supplied
by
the boat's 12
volt
electrical
sys-
tem.
The
power
cable
may
be at-
tached to an
accessory
or
power
buss,
but if
you
have
problems
with
electrical
interference,
the
cable should
be attached
directly
to the
battery.
If a
longer
cable is
required,
use
ordinary
#18
lamp
cord available
at
any
hardware or
electrical
sup-
ply
store.
Splices
should be
sol-
dered, however,
if this
isn't
done,
then use
crimp-type
splices. Tape
all
splices
with electrical
tape.
An in-line fuse holder with
fuse
is
supplied
with the Z-15. Be cer-
tain to install this as close to the
power
source
(such
as the
boat
battery
or
power buss)
as
pos-
sible.
This will
protect
both the
sonar unit and the
power
cable
in
the event a short occurs.
Crimp
connectors
are
supplied
to attach
the fuse
holder to the
power
cable. The red
wire in the
power
cable is
the
positive
conductor.
The
black wire is the
ground
or
negative
conductor.
The
graph
is
protected
from ac-
cidental
polarity
reversals and no
damage
will occur if the wires are
reversed. The unit will not
operate
until the
proper polarity
is
applied.
Figure
2
18
3
Ground
(Negative)
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