L
SECTION2
DESCRIPTION
2.1.0 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 MULTIPLE
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
ACIDC
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 1 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 RS152B. 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.
2-1
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 200KHz to 1
GHz
in 100Hz 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
SIN
AD
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.
2.10.0 TERMINATED RF POWER MEASUREMENT
RF
power
is
measured when the Communications Ser-
vice Monitor
is
in the power monitor mode. The built-in
RF
load dissipates up to
125
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.
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