Rohde & Schwarz CMD53 GSM900/1800 Digital Radio Communications Test Set

The Rohde & Schwarz CMD53 is a digital radio communications test set engineered for GSM900 and GSM1800 mobile phone and base station validation. It simulates a GSM base station with dual RF synthesizers—one delivering continuous BCCH signal—enabling rapid measurement cycles and high production throughput. The CMD53 performs essential signaling, generation, and measurement functions across device synchronization, call procedures, handover scenarios, power consumption analysis, and signal quality assessment. Its compact form factor, menu-driven interface, and autotest automation eliminate the need for deep GSM protocol knowledge while delivering measurement accuracy and speed required in production, service, development, and quality assurance environments.

– Technical Specifications

• Operating frequency bands: GSM900, GSM1800
• Dual RF synthesizers with continuous BCCH generation
• DC current and voltage measurement with pulsed-signal accuracy for mobile power consumption analysis
• Phase and frequency error measurement (CMD-B4 option)
• Power ramp measurement as function of time (CMD-B4 option)
• Bit-error rate (BER) measurement capability (CMD-B4 option)
• Narrowband spectrum analysis for I/Q modulator balance verification (CMD-K43 option)
• High-contrast backlit LCD with soft-key menu interface
• Remote control via IEEE interface

– Key Features

• Simulates GSM base station for mobile device testing
• Mobile-to-base station synchronization verification
• Location update and incoming/outgoing call setup testing
• Mobile power level control and measurement
• Single-band and dual-band handover testing including channel and time-slot changes
• SACCH measurements: Rxlev, RxQual, power level
• Echo test for rapid go/no-go assessment of microphone and loudspeaker function
• Call clearing initiated by mobile or network
• Peak power measurement
• Parallel measurement execution and multi-command IEEE strings for accelerated throughput
• Single-keystroke autotest routines

– Optional Extensions

• GSM1900 (PCS) standard support
• DECT standard support
• High-sensitivity 2nd RF input
• CMD-U10 memory extension for dual-band handover and fast BER measurement
• CMD-U20 for realistic dual-band network simulation with BCCH band selection

– Typical Applications

• Mobile phone production testing and service
• Base station development and validation
• Device quality assurance
• Manufacturing line verification