ECE :: Communication Systems
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For an antenna of height ht metres, the radio horizon is equal to
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If in a radio receiver, RF signal has a frequency of 800 kHz and local oscillator that of 1000 kHz, then at the output of the mixer, the frequencies found would be __________ kHz.
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In the stabilized reactance modulator AFC system
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In AM, the modulation envelope has a peak value double the unmodulated carrier level, when the modulation is
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Which of the following is correct (FDM means Frequency Division Multiplexing and TDM means Time Division Multiplexing)?
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Consider the following applications/ advantages of radar beacons
- navigation
- target identification
- accurate tracking of enemy targets
- large increase in maximum range
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The maximum permissible distance between two samples of a 10 kHz signal
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A.
phase modulation is converted into amplitude modulation by the equalizer circuit
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B.
the discriminator frequency must not be too low or the system will fail
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C.
the discriminator must have a fast time constant to prevent demodulation
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D.
the higher discriminator frequency, better the oscillator frequency stability
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