I disagree with you. To be clear, "sampling each up and down deflection" is exactly the right idea in the case that you have no other information besides the sa

I disagree with you. To be clear, "sampling each up and down deflection" is exactly the right idea in the case that you have no other information besides the samples (and besides knowing the hypothesis of the sampling theorem is satisfied). To use the more general version of the sampling theorem, you in addition need to know the center frequency (100 MHz in your example), otherwise you cannot reconstruct the signal. So already the setting is slightly different. You need an additional assumption. Take a look at Wikipedia: https://en.m.wikipedia.org/wiki/Nyquist%E2%80%93Shannon_sampling_theorem#Sampling_of_non-baseband_signals https://en.m.wikipedia.org/wiki/Nyquist%E2%80%93Shannon_samp... it suggests that Shannon himself considered your case an additional point on top of the sampling theorem.