Which unit is used to measure RF signal-to-noise ratio (SNR)?
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Correct answer: dB.
Why this is the answer
The correct answer is dB. Signal-to-noise ratio (SNR) is a dimensionless ratio comparing the level of a desired signal to the level of background noise. When expressed in decibels (dB), it represents a logarithmic ratio, making it suitable for comparing two power levels. dBi (decibels relative to an isotropic radiator) measures antenna gain relative to a theoretical isotropic antenna. dBm (decibels relative to one milliwatt) measures absolute power levels, where 0 dBm equals 1 milliwatt. mW (milliwatts) is an absolute unit of power, not a ratio.
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