ECE 4700 Midterm: ECE4700 Wayne State Exam SolutionsF2002M2

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Determine the efficiency and the output spectrum for an am modulator operating with a modulation index of 0. 5. The carrier power is 50w and the message signal is m(f)= 4 cos[2 fmt - /9] + 2sin[4 fmt]. Assume carrier frequency 1 khz: 20 points. Consider a superhetrodyne receiver designed to receive the frequency band of 1 to 30. An incoming signal with a carrier frequency 10- At this setting of the receiver we also get interference from a signal with some other carrier frequency if the receiver rf stage bandpass filter has poor selectivity. What is the carrier frequency of the interference signal: 15 points. A super heterodyne receiver uses an if frequency of 455 khz. The receiver is tuned to a transmitter having a carrier frequency of 1120 khz. Give two permissible frequencies of the local oscillator and the image frequency for each: 15 points. A modulating signal m(t) cos(100t) + 2 cos(300t).

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