La description

Key Facts The R&S®SMW-B20 option provides phase and frequency modulation.
Specifications Maximum FM deviation FM mode: normal, f > 3 GHz) 40 MHz Maximum ?M deviation ?M mode: high deviation, f > 3 GHz fmod ? 80 MHz / deviation 80 rad Modulation source internal, external, internal + external Modulation frequency response 10 Hz to 10 MHz <3 dB''