dBm |
Refers to the dBm power level scale. Referenced to 0.775 volts in 600 ohms at one milliwatt. dBm only used for 600 ohm circuits. |
Used to compare gain or loss in decibels in power functions (such as amplifiers, etc.) Like all decibel functions, expresses a relationship not an absolute value. | See decibel for more. As a logarithmic scale if the amplification of an amplifier is increased from 25 dBm to 28 dBm, that increases the amplification by 2x. Halving the power (1/2) subtracts 3 dBm. |