Discussion
What does dBm express?
Answer: C
A dBm figure is power in decibels above one milliwatt, so zero dBm is one milliwatt and thirty dBm is one watt. Referring to a watt gives dBW, which is thirty decibels lower numerically, gain against a dipole is dBd, and field strength against a microvolt per metre is dBuV/m. Mixing these references is the most frequent arithmetic error in radio engineering, and writing the reference explicitly in every line of a budget is the cure.
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