Ken Kundert
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That advice stems from the type of noise they are observing, which is sampled noise. When you sample a signal, the spectrum repeats as the sample frequency, and since the signals are real, they are symmetric about DC, so you only need to measure from 0 to half the sample frequency.
It sounds as if you are not sampling your signals, so you would not follow this advice.
I would expect SpectreRF to work fine for you as long as you choose a large enough value for maxsidebands and maxacfreq.
-Ken
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