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Ralph A. Schmid, dk5ras ralph at schmid.xxx> But his original problem is not with saturated preamps or ADC ... it's aliasing ... > and that can be solved in the digital domain provided fast enough ADC. Yep - if this really is the problem. Aliasing-alike effects also often come from nonlinearities in the overdriven input stages...BTST, GTTS :) The RTL2832 shows this all the time, copies of strong signals show up in expected (from aliasing, proven by simply doing the maths) and not-so-expected areas of the spectrum. > Cheers, > > Sylvain Ralph.