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dBm us almost exactly the same as dB.

The only difference is that there is a reference of 1 Watt = 0 dB, and 1 mW = 0 dBm.

Sorry but that is incorrect. db is a ratio and not an absolute value, by it self it means nothing. you got the dbm part right, 1 mW = 0 dbm and it is an absolute value.

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