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

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

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Communication Systems
Circular polarization

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

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