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Node A is communicating with node B through a link of length 31km with a loss...

Node A is communicating with node B through a link of length 31km with a loss of 4.2 dB/km. Assume the transmitter power at A is 73dBm. If the signal is amplified at 5km by an amplifier and the received signal power at B is 6,111mW. What is the gain of the amplifier in dB?

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