The family of Radiocommunication Service Monitors CMS comprises two models. These radio testers allow transmitter, receiver and duplex measurements to be performed on mobile radios, base stations or RF modules. The CMS family monitors are ideal radio testers for service, maintenance and test departments.

CMS – a test set replacing many individual measuring instruments

Due to the comprehensive standard configuration of the individual models and the optional extensions tailored to specific applications, external measuring instruments in addition to the CMS are not required.

Overview of models:

Basic features:

• Transmitter and receiver testing
• Spectrum monitor
• Fully automatic testing
• SSB test

CMS57 – the specialist for avionics

Basic features additionally with:

• VOR/ILS signal generator

Overview of configurations (model-dependent or optional)

Signal sources

• RF synthesizer from 0.4 to 1000 MHz, resolution 10 Hz, with AM, FM, φM and multitone modulation capabilities
• Two independent modulation generators, from 20 Hz to 30 kHz each, resolution 0.1 Hz
• Selective-call encoder to all standards (also user-programmable)
• CDCSS coder
• DTMF coder
• 10 MHz reference frequency input/output
• VOR/ILS signal generator

Measuring facilities

• RF frequency counter, RF frequency-offset counter
• Power meter from 5 mW to 100 W
• Selective RF power meter down to -100 dBm
• RF spectrum monitor with wide dynamic range and filters which also allow modulation analysis (AM, FM, SSB)
• Tracking generator in frequency range from 400 kHz to 1000 MHz
• Adjacent-channel power meter with standard ETSI filters
• Modulation meter for AM, FM and jM; weighting: +PK, -PK, PK HOLD, PK/2, RMS, RMS2
• Duplex modulation meter for duplex spacings of any size
• AF voltmeter with peak and true RMS weighting
• SINAD meter with variable test frequency
• S/N meter
• Distortion meter with variable test frequency
• AF frequency counter with period and gate-time counting
• Selective-call decoder for all standards (also user-programmable)
• DTMF decoder
• CDCSS decoder
• Oscilloscope
• DC ammeter/voltmeter
• Transient recorder for analysis of power and frequency transients
• Cable fault test

Filters

• CCITT or C-message filters for weighting to relevant standards
• Continuously tunable bandpass filter from 50 Hz to 5 kHz with high skirt selectivity for selective modulation and AF measurement
• Continuously tunable notch filter from 100 Hz to 5 kHz for signal suppression
• Highpass and lowpass filters for band limiting and measurement of subaudio tones

Other facilities

• Second RF input with high sensitivity for off-air measurements, can be used independently for module testing
• Built-in 600 Ω AF transformers for modulation generator and AF voltmeter
• Connector for battery (11 V to 32 V)
• 13 dBm RF output for off-air measurements
• Memory for storing complete instrument setups

Automatic tests

Automatic test routines are indispensable for high throughput and reproducible results in service and production: in the learn mode, the Radiocommunication Service Monitor CMS stores all manual settings and measurements and produces from them ready-to-start automatic test routines. The user need not have any programming knowledge or learn equipment-specific command sets.

Tolerances, comments and conditions (loops, jumps, queries and control commands) can additionally be inserted into the test routines. Programs can also be activated directly from the memory card. The test report format may be user-specified and can be clearly structured by transferring control characters to the printer, such as blank line, paragraph and bold-face.