WiFi signal strength
What is signals strength
WiFi is a radio signal and it has limitations in reach given firstly by the transmission output and
by the quality and shape of the antennas. Signal strength is indicated in decibels per milliwatt
of output (dBm), often (incorrectly) simplified to “dB”. Signal strength has a negative value and
it applies that the lower the value (a higher number after the negative sign), the worse.
The decibel unit is non-dimensional and expresses the logarithm of a ratio of two values.
In our case, it is the ratio of received output to an etalon of 1 mW:
This means that if you have a signal of -54 dBm, it is higher (better) than a
value of -82 dBm.
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