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 ).

contexto.120

3 years ago

Answer:

It is given that there is a loss of signal 2dB per km.

So total loss suffered in 5km = -2 x 5 = -10 dB.

In both input and output amplifiers, the total gain of the signal is given by:

$= (10 + 20) d B$

$= 30 d B$

So the overall gain of the output signal is

$= (30 - 10)$ dB $= 20$ dB

Gain $= 20$ dB

We have to calculate the output power. We have: