An absolute measure of power is the dBm scale, in which power is specified in decibels relative to one milliwatt. Specifically, P(dBm) = 10log10[P(mW)/1 mW]. Suppose that a receiver is rated as having a sensitivity of –20 dBm, indicating the mimimum power that it must receive in order to adequately interpret the transmitted electronic data. Suppose this receiver is at the load end of a 50-Ω transmission line having 100-m length and loss rating of 0.09 dB/m. The receiver impedance is 75Ω and so is not matched to the line. What is the minimum required input power to the line in (a) dBm, (b) mW?
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