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yeap, that's exactly what I did. Using the old boat anchor comm. test set that I have, inject a signal
at various frequencies. Between the above mod and adjusting the rtl's manual gain control, I can keep it accurate from -40
to -100 dBm. For every 10 dB step of attenuation within that range, the graph in Al's python script changes by exactly 10 dB.
Close enough for me...