In a simple one-way telecommunications system shown in Figure Q6(a), themicrophone produces a power output of 10μW and a satisfactory loudspeaker outputmay be taken as 40mW.

a) Calculate the required power gain, power output and r. m. s. output voltage swing of an amplifier when it is placed[14 Marks] i.at the microphone ii. immediately before the loudspeaker, taking the amplifier load as 160. Discuss in the light of your results how noise is a limiting factor as the line length is further increased and also why baseband communication systems are limited to-relatively short distances.[11 Marks]