Specifications

Figure
3
BASIC
OPERATION
ON-OFF and
SENSITIVITY
Control
Rotate the
ON/OFF knob clock-
wise to turn
the unit on. The Sen-
sitivity
knob
works much like the
volume control on a
radio,
that
is,
weaker
signals
will be detected
with
higher
settings
of the knob.
When
cruising,
or at other times
when
just
simple
bottom-contour
information
is
desired,
the Sen-
sitivity
setting
can be low. In
deep
water
or over
soft,
muddy
bot-
toms which
produce
weak
echoes,
the
setting
will have to
be
higher.
When
high
Sensitivity settings
are
used,
a
second bottom
echo will
appear.
This is normal and is
caused
by
the
returning signal
re-
flecting
off the surface of the wa-
ter,
making
a second
trip
to the
bottom
and back.
When detailed information
about
brush
piles,
individual fish or the
thermocline is
desired,
the Sen-
sitivity
knob should be set
ap-
proximately
to the ¾
point.
Refer
to the illustration below to see
what effect the
Sensitivity
setting
has
on the recorded
information.
Recording
individual fish with an
"arched"
signature
can
usually
be
accomplished
at
trolling speeds
with the
Sensitivity
knob at the ¾
point,
or
higher.
Refer to the sec-
tion
"Arched
Signatures"
for more
information about this
important
function of
your
recorder.
3. Reduces the
reverberation ef-
fect. This
happens
mainly
on
lower
frequency units,
al-
though
it does
sometimes
show
up
on
high
frequency
graphs.
To use the Transmit and
Print Al-
ternate
function,
turn the
range
control to
100
feet.
Next,
hold
down the marker switch
and turn
the
range
control to
80
feet.
Now release the marker
switch.
Return the
range
control to
your
original setting.
The
MACH 1 will
now be in the Transmit and
Print
Alternate mode.
Remember,
the
marker control must be
"ON" dur-
ing
the
period
of time that
the
range
control is
turned from 100 to
80 feet.
To return the MACH
1 to normal
operation, simply
reverse
the
op-
eration
by turning
the
range
con-
trol to 80
feet,
hold
the marker
switch
"ON",
rotate the
range
control to
100
feet,
and release the
marker
switch.
NOTE: A
simple
way
to return
any
of the
optional
features back
to normal
operation
is to turn the
sensitivity
control to the "OFF"
position
and then
turn it back
"ON". This
turns off the
power
to
the
unit,
erasing
all of the
op-
1
APPROXIMATE PAPER SPEED
RANGE
(feet)
10-100
140-200
300-600
1000
Minimum
Paper
Speed
Maximum
Paper Speed
Inches
Per Mm
Hours
Per
Roll
Inches
Per Mm
Hours
Per
Roll
0.6
0.4
0.2
02
17
25
50
50
2.0
1.2
0.75
015
5.0
8.3
13.3
13.3
n
Figure
36
(with
Alternate
Transmit and
Print)
By
comparing
this chart with the
one on
page
6,
you
can see
that a
significant
amount of
paper
can be saved
by
using
the Alternate Transmit
and Print
function.
2
2L1
SENSITIVITY: PROPER
SETTING
Figure
4
SENSITIVITY: TOO LOW
Figure
37
Figure
5
4
17
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