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Figure 15.3 shows a communication system. What is the output power when input signal is of 1.01mW? (gain in dB = 10 log10 (Po/Pi ).

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Loss suffered in transmission path

= – 2 dB km–1 × 5 km = – 10 dB

Total amplifier gain = 10 dB + 20 dB

= 30 dB

Overall gain of signal = 30 dB – 10 dB

= 20 dB

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