Section 2 - Description; Description; Microprocessortechnology; Portability - Motorola R-2400 Operator's Manual

SECTION
2
DESCRIPTION
2.I.0
DESCRIPTION
The R-2200 and R-2400 are test instruments
designed
and manufactured by Motorola to perform the
most
commonly
used tests
on radio
communications equip-
ment.
Rugged and
portable, the Communications
Serv-
ice
Monitors
are
designed
for
technician
productivity.
2.2.0
MICROPROCESSOR TECHNOLOGY
The R-2200 and R-2400 Communications
Service
Moni-
tors
use advanced engineering design based
upon
a
Motorola
M-6800
series
microprocessor. The units
fea-
ture liquid crystal
displays
(LCD) and a
sealed mem-
brane keyboard
for
easy and accurate
entry
of
data. The
LCD's
show exactly what
displays
and functions
are ac-
tive at any time. The
displays change as
you
switch
monitor functions, and
prevent
you from
selecting an
invalid readout.
2.3.0
MULTIPLB FUNCTIONS
The microprocessor
design
permits a wide variety of
service applications.
The
R-2200 is capable
of perform-
ing
tests
which require:
Modulation Oscilloscope
"Off-the-Air" PL
Counter
Multimode
Code Synthesizer
AC/DC Digital Analog Voltmeter
General Purpose Oscilloscope
SINAD
Meter
Distortion Meter
RF Wattmeter
as
well
as
the traditional
service
monitor functions of
SIGNAL GENERATION, FREQUENCY
ERROR and
MODULATION
measurements.
In
addition,
the
R-2400 provides
a
spectrum analyzer display
while
simultaneously
monitoring the
received signal.
2.4.0 PORTABILITY
Weighing under
30
lbs. (13.6 kg),
the
unit's form factor
is
engineered
for
ease
of carrying. The optional internal
battery allows
t
hour
continuous operation.
Time
is
saved
since
the technician
has
to
transport
less
equip-
ment and does
not
have
to
take time to unpack,
hook-up,
disconnect and repack additional equipment.
2.5.0
DURABILITY
The R-2200 and R-2400 are
field environment tough
and
meet the shock and
vibration portions of EIA
specifica-
tion RSl52B.
The units
have been subjected
to
acceler-
ated
life
testing, during the design
stage,
to
ensure the
best
possible
design
and
reliability.
The
Mylar
covered
keyboard is
sealed
against moisture,
dirt,
dust and oil.
2.6.0
HUMAN
ENGINEERING
The
R-2200
and
R-2400
are human
engineered.
The
membrane keyboard
with
audible feedback
ensures ac-
curate
data
entry. Front panel controls
are
grouped by
function for
simple
operation. The microprocessor
con-
trolled LCDs provide autoranging analog and digital
displays.
2.7.0 AM/FM SIGNAL GENERATOR
The built-in general purpose signal generator provides
continuous coverage
of the HF, VHF,
and
UHF
land
mobile spectrum
for
receiver testing. Many forms of
external and
internal modulation
can be simultaneously
impressed on the
carrier
signal
for
actual composite sig-
nals.
The frequency range of the RF signal generator
is
from
200
KHz to
1.
GHzin
100
Hz
steps.
The output of up
to
1
VRMS provides sufficient amplitude to
get through
misaligned tuners and receivers and is especially
effec-
tive when
changing
a
receiver's frequency. The high
level, calibrated output is available over the entire fre-
quency range
of the
Communications
Service
Monitor.
2.8.0 SINAD METERING
A
comprehensive check of receiver performance
can be
made
with
a
SINAD
measurement.
The
analog meter
bars and
digital display of SINAD appear automatically
whenever that measurement mode
is
selected.
Hook-up
is
simple
with only two
connections required
and
measurements
can then be accomplished without the
need
for
a separate signal generator, SINAD meter or
distortion
analyzer.
2.9.0 DISTORTION METER
The distortion meter provides receiver
or
transmitter
audio
stage
quality measurement without
a
separate sig-
nal
generator or distortion meter.
It
also
provides higher
resolution than
an
oscilloscope
to
ensure the
radio under
test meets
all distortion
specifications.
2.IO.O
TBRMINATED RF POWER MEASUREMBNT
RF power is measured when the Communications
Ser-
vice
Monitor
is
in the power
monitor mode. The built-in
RF load
dissipates
up
to
L25
watts.
If
a
higher powered
transmitter should be keyed into the unit or
if
a
lower
power transmitter
is
keyed
into the unit for
a
prolonged
time threatening overheating
of
the power
measuring
circuitry, the audible alarm
sounds and
the LCD's
dis-
play
changes
to
read
"OVER POWER" or "OVER
TEMP",
thus
warning the technician to de-key. The in-
strument
is
further
enhanced by the
simultaneous indica-
tion of RF
power output, carrier frequency error
and
modulation, all at the
same time.
L
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