Communication Systems
Fourier analysis indicate that a square wave can be represented as

A fundamental sine wave and even harmonics
A fundamental sine wave and harmonics
Fundamental and subharmonic sine waves
A fundamental sine wave and odd harmonics

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Communication Systems
Circular polarization

Is useful in reducing depolarization effect on received wave
None of these
Involves critical alignment of transmitting and receiving antenna
Is useful in discrimination between reception of adjacent beams

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