R&S SMB Frequency Modulation - FM
1407.0806.32 4.65 E-2
Frequency Modulation - FM
An internal and/or external source can be selected for frequency modulation. A LF modulation
generator is available as internal sources. Two-tone FM is possible by simultaneously switching on the
external and internal source.
The MOD 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) can be selected.
Selection between three modulation modes is possible:
- Normal mode with full setting range for modulation bandwidth and FM deviation.
- Low Noise mode with better signal/noise ratio, but reduced setting range for modulation bandwidth
and deviation (see data sheet)
- High Deviation mode with full setting range for FM deviation and a reduced setting range for
modulation bandwidth (see data sheet).
Note:
It is not possible to use frequency modulation simultaneously with phase modulation.
Frequency Modulation Menu
The Frequency Modulation menu is opened in the Mod function block or using the MENU key under
Mod.
In the upper section of the menu, the modulation source is selected and the modulation is switched on.
The modulation source can be selected independently for the different modulation types and the LF
output. The configuration of the selected external and/or internal modulation source is performed in the
lower section of the menu or in the Mod Gen block (internal source only). These settings affect all
modulations which use the same modulation sources.
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