Antenna engineers like logarithmic terms, and we say this no-gain situation is 0 dBi (pronounced zero dee bee eye). Decibel Conversion Calculator. Decibels are defined as ten times the log of a power ratio. Decibels convert multiplication and division calculations into simple addition and subtraction operations. This calculator converts between decibels, voltage gain (or current), and power gain.
![]() ![]() ![]() For example, doubling the power from 1 watt to 2 watts is the same ratio as 10 watts to 20 watts, that is a +3dB change, while a -3dB change means that the power ratio will be halved.If the dB ratio is positive in value, then it means amplification or gain is present as the output power is greater than the input power (P OUT > P IN). However, 20dB is not double the power of 10dB.The decibel also shows us that any change in power by the same ratio will have the same decibel ratio. The decibel allows us to present large ratios of powers using small numbers and we have seen above that 30dB is equivalent to a power ratio of 1000 with the most commonly used decibel values being: 3dB, 6dB, 10dB and 20dB (and their negative equivalents). Anydvd hd licenseClearly then 0dB means the power ratio is one with no reduction or gain of the signal.
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