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Satellite Communication - Engineering

Q1:

In satellite communication, frequency modulation is used because satellite channel has

A small bandwidth and negligible noise

B large bandwidth and severe noise

C maximum bandwidth and minimum noise

D high modulation index

ANS:B - large bandwidth and severe noise

FM used to be used for analogue TV via satellites because it had excellent noise immunity compared to AM and provided a relatively good signal lock. PSK is much more efficient than FM and allows much better quality for the same bandwidth or in reality many more channels in the same bandwidth.