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An RTL-SDR outputs 8-bit integer IQ values via its USB connection data packet. That creates a fixed limit to the range of possible values (0 to 255 unsigned, or -128 to 127 signed, not -1.0 to 1.0, unless scaled somewhere). Your IQ signal will usually be a result of a mix of RF sources. A significant portion of RF noise is additive (a smaller portion might ...

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