ECE :: Communication Systems
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If velocity of sound waves in air at 0°C is 330 m/s, the velocity at 40°C is about
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A 5000 W signal is attenuated by - 196 dB. The resultant signal strength is
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In FM, as bandwidth increases
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A 400 W carrier is amplitude modulated with m = 0.75. If single side band suppressed carrier is used the total power in modulated wave is
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In TV transmitter, the function of duplexer is
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Microwave link repeaters are typically 50 km apart in TV transmission due to
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Assertion (A): The colour signal consists of only luminance signal
Reason (R): In India PAL colour signal system is used.
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To separate channels in FDM receiver we have to use
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A device with input x(t) and y(t) is characterized by y(t) = x2(t). An FM signal with frequency deviation of 90 kHz and modulating signal bandwidth of 5 kHz is applied to this device. The bandwidth of the output signal is
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Assertion (A): Bandwidth of a TV signal is 5 MHz.
Reason (R): TV systems use vestigial side band transmission.
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or v = 353 m/s.
or P = 1.26 x 10-16 W.
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B.W. for x(t) = 2(90 + 5) = 190 kHz