ECE :: Communication Systems
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In a system using QASK and 4 bits to form a symbol, the required bandwidth is
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Each of the following statements regarding frequency modulation is true except
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Assertion (A): Radio transmission is by sky waves
Reason (R): Waves having frequencies higher than 30 MHz penetrate the atmosphere and do not return to earth.
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During playback the take up reel is
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To avoid objectionable noise in a microwave TV link, the SNR should be about
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Foster Seeley discriminator uses a
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Which of the following statement about modulation is correct?
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Sound wave travels as
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FM signal can be generated by
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A.
amplitude of the modulated wave remains the same as that of carrier wave
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B.
the amount of variation of deviation from the original carrier frequency is determined by the frequency of the modulating signal
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C.
the rate at which the frequency of modulated wave varies is determined by the frequency of the modulating signal
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D.
frequency of modulated wave increases as the signal voltage increases and vice-versa
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