For example: Agilent E4440A or Anritsu 68369
Spectrum Analyzers
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Advantest R3541B Overview
The R3541B Modulation Accuracy Measurment Unit is a companion unit designed for use with the R3265?R3271 Spectrum Analyzer family. The R3541B measures the modulation accuracy of pi/4 DQPSK digital modulation in JCT-Japanese Cordless Telephone systems. The R3541B consists of a down converter, high-speed digitizer, digital signal processor, and interface to the R3265/R3271. Option 070 allows constellations, eye patterns, and waveform phase and amplitude of each symbol.