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SECTION3
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 1,2,3,4,5,6,7, 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
wa~eforms
received or generated
by
the service monitor.
lt 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
In/
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
positio~
t?ggle switch.
In
the
full
down position,
"OFF",
the
umt
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
powe
red
.
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 "CW".
posi-
tion allows
the unit to generate unmodulated
RF
s1gnals
and
the "AM" position
generates or
monitors
amplitude
modulated
signals.
1111 1111
•33~tH~
..
.
FIGURE 3-1-CLOSEUP
FRONT VIEW
3-1
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