ECE :: Communication Systems
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Two sinusoidal signals of same amplitude and frequencies 10 kHz and 10.1 kHz are added together. The combined signal is given to an ideal frequency detector. The output of the detector is
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In Vidicon camera tube, the resistance of photoconductive material on the target plate
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In a satellite transponder the power amplifier feeds power P to the transmitting antenna of gain G. If distance of earth is d, the power flux density is
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The percentage saving in power of 100% modulated suppressed carrier AM signal is
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Which of the following are useful in comparing the noise performance of receivers?
- Input noise voltage
- Noise figure
- Noise resistance
- Noise temperature
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Compact discs use
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A carrier is phase modulated (PM) with frequency deviation of 10 kHz by a single tone frequency of 1 kHz. If the single tone frequency is increased to 2 kHz, assuming that phase deviation remains unchanged, the bandwidth of the PM signal is
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In a communication receiver, a squelch circuit is normally inserted
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In PCM, the information lies
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A carrier is simultaneously modulated by two sine waves having modulation indices of 0.4 and 0.3. The total modulation index will be
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2(fm + Df)
.