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In telecommunications, particularly in radio frequency, signal strength refers to the transmitter power output as received by a reference antenna at a distance from the transmitting antenna. High-powered transmissions, such as those used in broadcasting, are expressed in dB-millivolts per metre. For very low-power systems, such as mobile phones, signal strength is usually expressed in dB-microvolts per metre or in decibels above a reference level of one milliwatt. In broadcasting terminology, 1 mV/m is 1000 μV/m or 60 dBμ.
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