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  • Figure shows a communication system What is the output power when the input signal is of 1. 01 mW gain in d_B equals 10 log_{10} P_o P_i

Figure shows a communication system. What is the output power when the input signal is of 1.01mW? (gain in dB = 10 log10 (Po /Pi ).

Answers (1)

The loss of signal during the transmission  = 2 \: \: dB/km

The total path covered by the signal  = 5 \: Km

Collective loss suffered = -10\: dB

Total amplifier gain = 30 \: dB

Total gain in signal  = 20 \: dB
 

Gain in dB = 2

Input power = 1.01 mW

Thus, output power would be,

P_o = 1.01 \times 100

Hence, the output power is 101\: mW.

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infoexpert21

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