Example $4$

A receiver antenna with a $75-$Omega input resistance operates at a room temperature.

The received signal with a bandwidth of $6$ MHz $.$ The received signal voltage of

$8\mathrm{.}3$ uV is applied to an amplifier with noise figure of $2\mathrm{.}8$ dB $.$ Find

a$)$ the input signal power

b$)$ the input noise power

c$)$ Input S$//$N in decibals

d$)$ Output S$//$N of the amplifier

solve based on communication principle