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2·1.
DESCRIPTION
SECTION 2
DESCRIP1"10N
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
R F 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, which are similar to a bar
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 WAR Nl NGS. 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 keyboard and
may be programmed from 0 kHz to 99.9 kHz, with 100Hz resolution.
2-6.
FUNCTIONS.
The following paragraphs briefly describe the major functions of the Communications
System Analyzer.
2-1
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