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+3.01 dB is approximately double the power; −10 dB is one tenth.

dBm expresses an absolute power level relative to 1 milliwatt, combining the logarithmic dB scale with a fixed power reference.

Gain describes the ratio of output to input level. In a receiver it can occur before or after digitisation and is often expressed in dB.

Signal-to-noise ratio compares wanted signal power with noise power in the range being considered. It is often expressed in dB.