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Question about SA Coherence Mode?

Question asked by mindhen on Jul 11, 2020
Latest reply on Jul 14, 2020 by Dr_joel

In VNA help,SA option,how to understand the words below ?

"It ensures the Nyquist images of the signal tones in the IF bandwidth are not falling back on top of real signal frequencies. To be able to enable Nyquist protection, the tone spacing of the coherent signal cannot be an integer divider of the ADC sampling clock (100MHz for a PNA). "

From my previous knowledge, is this setting guaranteed by anti-aliasing filters?

tks for help!