What is dbm unit

See below. The abbreviation dBm stands for decibel milliwatts. It refers to the amount of power that an antenna or amplifier is able to produce, or how much signal is present at a site. Decibel milliwatts are, as the name suggests, measured relative to milliwatts. Note that dBm and dB are measures of entirely different things. This is incredibly oversimplified and incorrect. It should be noted that dB is a measure of relative power and cannot be converted into watts. You can use dB as a tool to measure the difference between two dBm figures.

The two dBm that are being compared can be converted into watts, but dB cannot be. Understanding the meaning of the two measurements and what they are used for is essential if you wish to understand how cellular signal boosters work.

Both dB and dBm are logarithmic, not linear. Logarithmic scales are used to make it easier to represent very large numbers on a convenient scale. In the case of dB, each increase of three dB means that the signal strength has doubled, as shown in this chart below:. One person could have their phone showing one bar on the signal strength reading and still be able to make calls and receive text messages. Instead, users can get an accurate idea of the strength of a cellular signal by unlocking the diagnostic tools found on their phones.

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