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2-21.
Frequency Counter.
The frequency counter measures inputs in a range from 10Hz to 35 MHz. Its 5
digit auto-ranging output is displayed on the CRT and allows precise measurement and setting of offset
oscillators, 35kHz and 455kHz pager IF's, PL frequencies and other external input signals. This function will
also operate simultaneously with the generate or monitor receiver modes of operation. Frequency
measurement of transmitted carriers and other signals higher than 35 MHz is easily accomplished with the
frequency error readout in the monitor modes.
2-22.
AC/DC Voltmeter.
Switching to the DVM mode provides a digital-analog voltage presentation on the
CRT, along with the corresponding dBm value. The auto-ranging display provides full scale deflections of 1.
1
o.
100 and 300 Volts. AC or DC measurement is selected on the CRT. The meter's wide dynamic range and
three digit display are ideal for setting power supply voltages. checking bias levels, and setting audio levels.
Like the Frequency Counter, the DVM will operate simultaneously with generate or monitor operation.
2-23.
Power Supply.
The Communications System Analyzer may be powered by
a
variety of sources:
•
•
•
AC at 110 or 220 Volts, 50/60 Hz
DC from an external 12 Volt source such as a service vehicle
DC from an optional battery pack. Servicing can t11us be accomplished wherever the equipment under
test is located
2-24.
ACCESSORIES.
2-25.
Table 2-1 lists the accessories supplied with the Communication System Analyzer. Optional equipment
available for use with the unit is listed in Table 2-2.
ACCESSORY KIT
··:;:
.
PERfORMANCE RENlRT
'
Figure 2-1.
Accessories Supplied with Analyzer
2-4
2-1.
DESCRIPTION
SECTION 2
DESCRIPTION
2-2.
The Communication System Analyzer is a portable test instrument designed for servicing and
monitoring of portable, mobile, and land base communications equipment operating over the frequency range
of 1 MHz to 1 GHz. The unit performs the functions of signal generation. frequency error and modulation
measurement. It is also capable of a variety of tests normally associated with the following devices:
Spectrum analyzer
Duplex offset generator
Modulation oscilloscope
Frequency counter
AC/DC digital-analog voltmeter
RF wattmeter
General purpose oscilloscope
Multi-mode code synthesizer
SINAD meter
Sweep generator
2-3.
MICROPROCESSOR.
A Motorola M-6800 series microprocessor permits keyboard entry of data,
autoranging of displays, fast frequency access. and permanent storage of often-used frequencies and codes.
Generate and monitor RF frequencies, tone codes. and timing sequences can be programmed into
a
nonvolatile memory, saving time and eliminating entry errors. When one particular type of equipment is
continuously serviced. the unit can be programmed to select the mode of operation required when first turned
on.
2.4
DISPLAY.
All functions, generated or monitored, are presented on an 8 em x 10 em cathode ray tube
(CRT) in both analog and digital format, with the name of the function being displayed. The CRT also displays
control settings eliminating the need for operator search of different equipment panels. Digital readouts are
visually aided by the use of the continuously autoranging analog line segments, wl1ich are similar to a ba1
graph. Each has a base line and calibration markers, in addition to the intensified segment showing the
measurement. The user selectable displays are listed in
a
column beneath the DISPLAY heading on the front
panel. Choosing
a
display is accomplished by pressing an arrow button below the column, for up or down
movement, as required. When the appropriate arrow is pressed. the LED adjacent to the selected display
illuminates. FUNCTION is selected in the same way, providing rapid, accurate changes in service capability at
the touch of a button.
2-5.
SYSTEM WARNINGS.
To aid the technician in servicing, visual warnings will appear on the CRT when
certain overload or caution conditions exist. Displays warn of low battery power, overheating of the RF load, or
an
improper attenuator setting for particular measurements. In addition, a continuous audible alarm sounds
when a preset deviation limit is exceeded in monitor modes. This limit is entered by using the keyboarcl and
may be programmed from 0 kHz to 99.9 kHz, with 100 Hz resolution.
2-6.
FUNCTIONS.
The following paragraphs briefly describe the major functions of the Communications
System Analyzer.
2-1
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