signal strength

In telecommunications, and particularly in radio, signal strength is the measure of how strong a signal is. Typically, this is measured as voltage per square area. Higher power uses such as broadcasting use units of millivolts per square metre (mV/m). Very low-power uses are most often in microvolts per square metre (V/m). Expressed in decibels, 1mV/m is 0dBm (a shortened dB(mV/m)), or 60dB (often written dBu).

Some examples:

100dB or 100mV/m: blanketing interference occurs
60dB or 1mV/m: the edge of a radio station's protected area
40dB or 100V/m: the minimum strength a station can be received

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