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Ralph A. Schmid, dk5ras ralph at schmid.xxx> The filters you'd need wouldn't be in the R820T anyway (it has filters but not > that narrow). > IIRC, the rtl2832 always sample at a fixed high frequency but it has an internal > downconverter + FIR filter inside to convert the sample rate down. But that > FIR probably can't handle such a big reduction ... Still we must not forget that we're talking about some piece of silicon with nm structures, and therefrom no extraordinarily sharp filtering can be expected. When analog meets digital, it is important that the analog part protects the ADC from being overwhelmed by strong signals that are not in the scope of interest. All those silicon-only broadband receiver concepts drastically fail when being directly connected to a real good antenna in urban vicinity. They are good for a rubber duck style antenna sitting on your table, but that's it. There's a reason for all the solid silver and brass stuff in real world receivers :) > Cheers, > > Sylvain Ralph.