Which unit measures the power of a radio signal with reference to 1 milliwatt?
- A. dBw
- B. dBm
- C. mW
- D. dBi
Explanation: dBm is an abbreviation for “decibels relative to one milliwatt,” where one milliwatt (1 mW) equals 1/1000 of a watt. It follows the same scale as dB. Therefore 0 dBm = 1 mW, 30 dBm = 1 W, and -20 dBm = 0.01 mW
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