General; Section 3 - Operation - Motorola R-2400 Operator's Manual

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SECTIOI\3
OPERATION
3.1.0 INTRODUCTION
To become
proficient,
an
operator
must know the equip-
ment and its capabilities. Before operating the
service
monitor, carefully
study the purpose
and
function of
each
switch and indicator
described here and become familiar
with the operating
procedures
given.
3.1.1 SWITCH AND INDICATORS
See
figures
I
,2,3
,,4,5
,6,7
,,
and
8 for the
location of
assemblies, controls and indicators on the front of
the
service monitor.
3.2.0
GENERAL
The
service
monitor
is the
radio communication techni-
cian's universal
tool.
It
is required to
service
and main-
tain
most
AM,
FM
and
Cw
two-way radio equipment
and
needs
to provide
accurate measurements, have
dur-
ability
and
offer
fast, efficient
use.
This
service
monitor
was designed
to
meet
all
these
criteria.
A
front
view of
the
service
monitor, (figure
3-l
),
reveals
two
liquid
crystal
displays
which will provide
the
digital
and analog
readouts
for
any mode
of
operation selected.
To
the
left,
is a modulation
oscilloscope to display modulation
waveforms
received or generated by the
service
monitor.
It
can also
be used
as
a
general purpose oscilloscope for
routine trouble shooting procedures.
In
the R-2400,
it
functions
as
a spectrum analyzer.
A
sealed membrane
keypad is
used
for all
data entry. Each time
a
pushbut-
ton is
actuated
an audible
feedback
tone
will tell
the
operator the entry has been
accepted.
Operation
is
discussed
in
paragraph
3
.4.0.
Specific controls
are
grouped by function
and
outlined with red graphics to
reduce operator confusion.
Each section
will
be covered
in
detail later. The RF SECTION
with RF
carrier
rn/out
controls is at the bottom
left.
The OSCILLO-
SCOPE controls
are
to
the
right
and include the multi-
purpose input
used
for SINAD, distortion,
digital volt
meter and oscilloscope vertical inputs. In
the
R-2400,
the
frequency dispersion is controlled by this
section.
Next
is the
MONITOR
section
with
speaker and squelch
controls
for off
the air monitoring and on the right,
a
MULTIMODE CODE SYNTHESIZER to
allow
the
technician
to
modulate
an RF
carrier signal
with
PL,DPL,
timed signalling formats,
and external
sources
such as
a microphone or
audio generator.
3.2"1 POWER
The power on/off switch
is
a
three position
toggle switch.
In
the
full
down
position, "OFF", the unit
is
turned off.
The center position, "STBY", removes power from all
circuits except
for the
battery charger and
frequency
standard. This allows battery charging when not in
use
and maintains stability of
the crystal oscillator. This
is
especially
important
for
high stability units.
In
the
up
position,
"ON", all
circuits are powered.
3.2.2 MODE SWITCH
The mode
select
switch
is a
three position toggle
switch
which
selects
the type of
signal
to
be
monitored or gener-
ated. The
"FM"
position allows the unit to monitor or
generate frequency modulated
signals.
The
"C'W"" posi-
tion allows
the
unit to
generate unmodulated RF
signals
and the
"4M"
position
generates or monitors amplitude
modulated
signals.
FIGURE 3-I_CLOSEUP
FRONT VIEW
3-1
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