The R&S^®FMAx modulation analyzers combine the functionalities of several measuring instruments in a single box (RF counter, power meter, voltmeter, audio analyzer, distortion meter, FM stereo decoder). The R&S^®FMAx modulation analyzers are suitable for measurements in the field of broadcasting (e.g. on AM and FM transmitters) and radiotelephony as well as in the calibration of signal generators.

The traditional analog techniques of amplitude, frequency and phase modulation retain their important position in all branches of communication despite the increasing use of digital modulation. The concept of the FMx family – modulation analysis for today’s requirements – calls for measurement performance weIl beyond that of conventional modulation meters. The predecessor FAM from Rohde&Schwarz was a step in the right direction. Through the innovative FMx family with its range of application-specific models, this development has reached a new peak. The goals of this new design were:

• improved accuracy of all measurements
• higher measurement rates
• improved processing and presentation of the results
• optimization of the model range from the application point of view and
• retention of the basic concepts of the predecessor family FAM.

A standardized interface (the IEEE-488 bus) for applications in automatic test systems was just as important as a weIl-defined family of instruments for applications in stationary and mobile radiocommunication, in sound and TV broadcasting and in many navigation systems. Measurements on FM stereo signals are a major area of interest. Beyond the classic parameters such as modulation depth, deviation and carrier frequency, comprehensive analysis of the interfering modulation and the baseband source signal is provided for. Among the many other tests catered for are precise measurements of the carrier power and the transient behaviour of the RF carrier.