Keysight Technologies N9322C User Manual page 121

Key Reference
Frequency
Low Frequency
This softkey toggles the baseband channel on and off. When
Channel
it is set to On, the SSB and DANL performance will be
better from 3 kHz to 12 MHz. This softkey is only visible
when the option BB1 has been installed and only available
in Spectrum Analysis, Spectrum Monitor mode.
Key access: Frequency > CF Step
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