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power ratio dB of the measured power referenced to 1mW. 0 -30 dB awesome, -60 dB good, --90 dB bad
The signal strength reduces with distance: the further the sender, the weaker the signal — until it is no longer detected. IN THEORY, if one knows the transmission power of the source, one should be able to compute the distance between the sender and the receiver from the inverse square law.