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Hi,
In order to get the Noise floor more close to reality, I modified line 1448 in rtlsdr_scan.py.
I'm guessing it should be around -110 dBm in a 2 MHz BW (Sample Rate of 2,000,000 samples/sec).
By default I was seeing a noise floor of around -50 dB as indicated in plots, so I subtracted 60.
power = 10 * math.log10(scan[freq]) - 60
Then used only enough gain so as not to increase the noise floor upon scans..
Does this sound reasonable?