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Ralph A. Schmid, dk5ras ralph at schmid.xxxHi, > > Ah cool. Can you point me to papers/text showing how the n-th harmonic > > is being removed from the spectrum? > > N-th harmonic of what? Of the RF carrier. I guess there will be some harmonics, and I will have a look what my WBX produces if you are interested. > More recent devices are based on flexible integrated RF chips from Analog > Devices and Lime Micro that were specifically designed for commercial 3G > and 4G systems. I find it hard to believe that these SDR products are not > capable of passing international compliance requirements for GSM. Usually there is even for those low power applications some passband filter in the output path. Ralph.