(Solved): A communication receiver is connected to an antenna by a 300ohm transmission line that is 125m lo ...

A communication receiver is connected to an antenna by a $300\mathrm{ohm}$ transmission line that is $125\mathrm{m}$ long. The line has a loss of $3\mathrm{dB}$ per $100\mathrm{m}$. The noise figure for the receiver is $16\mathrm{dB}$. Calculate: a) The overall noise figure. b) The overall noise figure if a preamplifier with a gain of $20\mathrm{dB}$ and a noise figure of $3\mathrm{dB}$ is connected to the receiver. $[7]$ c) The overall noise figure if the preamplifier is connected between the antenna and the transmission line instead. [7]