Frequency modulation requires option R&S SMA-B20 (FM/PhiM Modulator) or option R&S SMA-B22 (Enhanced Noise Performance and FM/PhiM Modulator).
An internal and/or external source can be selected for frequency modulation. Two LF modulation generators and a noise generator are available as internal sources for a fully equipped instrument. Two-tone FM is possible by simultaneously switching on the external and internal source.
The FM/PM EXT input connector for external feed of analog modulation signals is at the front of the instrument. The coupling mode of the input (AC or DC) and the input impedance (50 Ohm or high) can be selected.
The digital FM signal is fed in via the AUX I/O interface.
Selection between Low Noise mode (with better signal/noise ratio, but reduced setting range for modulation bandwidth and deviation, see data sheet) and standard mode is possible (option R&S SMA-B22 only).
![]() | It is not possible to use analog frequency modulation simultaneously with digital frequency modulation or with analog or digital phase modulation. See "Simultaneous Operation of Several Modulations or Other Operating Modes" for an overview in detail. |
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