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| For other uses, see Decibel (disambiguation). Attenuation chart of an RG-6 Coaxial cable, measured in decibels per 100 feet of cable The decibel (dB) is a logarithmic unit of measurement that expresses the magnitude of a physical quantity (usually power or intensity) relative to a specified or implied reference level. Since it expresses a ratio of two quantities with the same unit, it is a dimensionless unit. A decibel is one tenth of a bel, a seldom-used unit. |
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