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(Datasheets, general refs: But what is the Fourier Transform?
A sudden power outage can cause damage to your decoder.
The RTL2832 ADC differential input impedance is ~3,300 Ohm.
The dynamic range for most dongles is around 45 d B.
You'll almost certainly notice a stable spike around DC.
It's from either the 1/f noise of the electronics or if it's a Zero-IF tuner (E4000) the LO beating with itself in the mixer.