Communication Systems
It is found that a ship to ship communication suffers from fading. This can be avoided by using

Space diversity
Broad band antenna
Frequency diversity
Directional antenna

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Communication Systems
In case of frequency modulation, modulating voltage remains constant if the modulating frequency is lowered, then

Amplitude of distant sidebands remains constant
Amplitude of distant sidebands first increases, then decreases
Amplitude of distant sidebands increases
Amplitude of distant sidebands decreases

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Communication Systems
In Pulse Code Modulation system

Large bandwidth is required
Suffers from the disadvantage of its incompatibly with TDM
Quantising noise can be reduced by decreasing the number of standard levels
Quantising noise can be overcome by companding

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