Question: 2] Given a baseband signal f(t) having an amplitude varying from -10 to 10 volts and a bandwidth of 20 KHz. This signal is

2] Given a baseband signal f(t) having an amplitude varying from -10

to 10 volts and a bandwidth of 20 KHz. This signal is

used to frequency modulate a 20 MHz P sarrier with an amplitude

2] Given a baseband signal f(t) having an amplitude varying from -10 to 10 volts and a bandwidth of 20 KHz. This signal is used to frequency modulate a 20 MHz P sarrier with an amplitude of 5 volts, and a frequency deviation factor equals to 4000 z rad/s.volts is used. (1) Give the expression for the instantaneous frequency of the FM signal and the expression for the modulated signal. 12 marks) alt) = Ke m(2)d2 s4) = A. Gulwilt alt) A. Cs(wet + KeAm slt) = A. One 4000 X lo n(t) (1 mark (ii) Is this a wideband or narrow band FM? KeAa = 170.3) I Ke Am AW %3D Wide Band [2 marks] (iii) Estimate the bandwidth and the power of the FM signal (iv) If it is a narrow band, sketch the modulator. If it is a wide band state two FM modulators. Explain one of them [2 marks] (v) Sketch two proper demodulators and explain the operation of one of them [3 marks]

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