The Rohde & Schwarz CMS57 1GHz Radiocommunication Service Monitor is a portable test instrument combining transmitter/receiver testing, signal generation, and comprehensive RF/AF measurement capabilities into a single unit. Designed for avionics, mobile radio, base station, and RF module servicing, it eliminates the need for multiple external instruments. The CMS57 delivers automatic test routine creation, intuitive menu navigation, and duplex measurement functionality across a 400 kHz to 1 GHz operating range.
Technical Specifications
Signal Generation
• RF synthesizer: 0.4 to 1000 MHz, 10 Hz resolution
• Modulation: AM, FM, phase modulation, multitone
• Two independent modulation generators: 20 Hz to 30 kHz each, 0.1 Hz resolution
• VOR/ILS/Marker Beacon signal generator with Autopilot functions (RF and AF outputs)
• Selective-call encoder (all standards, user-programmable)
• CDCSS and DTMF coders
• RF output: 13 dBm for off-air measurements
Measurement Capabilities
• RF frequency counter: 0.5 MHz to 1000 MHz (usable from 100 kHz); frequency-offset counter
• Power meter: 5 mW to 100 W; selective RF power meter to -100 dBm; optional 100 W RF Power Meter (CMS-B32) rated 100 W/3 min or 80 W continuous
• Modulation analysis: AM/FM/PM meters with multiple weighting modes; duplex modulation meter for independent two-port measurements; frequency and phase deviation meters; AM depth meter
• Audio measurements: AF voltmeter (peak/RMS, 600 Ω switchable); AF frequency counter (100 Hz to 6 kHz); SINAD meter; S/N and distortion meters
• Decoders: Selective-call (all standards), DTMF, CDCSS
• Digital oscilloscope, DC ammeter/voltmeter, transient recorder, cable fault test, automatic harmonic measurements
– Key Features
• Duplex transmitter and receiver testing on mobile radios and base stations
• Spectrum monitor with wide dynamic range and modulation-specific filtering
• SSB test capability
• User-programmable standards support
– Typical Applications
• Avionics radio system validation
• Mobile and base station transmitter/receiver servicing
• RF module acceptance testing
• VOR/ILS Autopilot signal verification
– Compatibility & Integration
Optional 100 W RF Power Meter module (CMS-B32) extends measurement range for high-power applications.
