# Tut of Electronics

May 5th, 2015
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Sketch the amplitude spectra of the signals a(t), b(t) and c(t) in the block diagram, respectively. Label the amplitude and the frequency axes. b. Determine the bandwidths of the signals a(t), b(t) and c(t), respectively. c. Design and sketch the block diagram of a receiver that will recover signals m1(t) and m2(t) from the modulated signal c (t).

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Tut of ElectronicsTutorial Sheet # 2 1. Sketch the time variation and frequency spectrum of an RF signal with 75 % Amplitude Modulation. Show several cycles of the modulated wave. Make the modulation frequency 1/10 of the carrier frequency. The unmodulated carrier has peak amplitude of 1.0V. In an amplitude modulation system, the message signal is given by Fig. and the carrier frequency is 1 KHz. The modulator output is SAM (t) = 2(b + 0.5m (t)) cos c t.2.a. Determine the average message power. b. If b = 1, determine the modulation index and the modulation power efficiency. c. Sketch

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