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In SDR receivers which use a mixer in front of the ADC to receive radio spectrum above the ADC sample rate(s), the sample rates and down-conversion frequency are usually independent settable (except possibly for the very bottom end of the range in some SDRs which don’t work (well?) for center frequencies below the sample rate.)


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Gnu Radio doesn't really know anything about frequency in cycles per second (Hz), only cycles per sample. The left of the chart is -0.5 cycles per sample, the middle is 0 cycles per sample, and the right is +0.5 cycles per sample. It's up to you to enter the correct numbers for "bandwidth" and "center frequency" if you want the scale on ...


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