D Page view A Read aloud (b) Find a PM modulated signal when k, = 10 (c) Determine the modulation index and maximum frequency deviation of FM modulated signal. (d) Determine the modulation index and maximum phase deviation of PM modulated signal. Problem 2: The message signal m(t) = 10 cos(2000nt) angle modulates the carrier signal c(t) = cos(2nfct), where f. = 10 kHz. %D (a) Find an FM modulated signal when k, = 200 (b) Find a PM modulated signal when k, = 10 (c) Determine the modulation index and maximum frequency deviation of FM modulated signal. (d) Determine the modulation index and maximum phase deviation of PM modulated signal.

If the carrier frequency 1000hz and reference voltage =10 V with modulation Index 0.4 and modulation frequency 8. find output voltage and frequency?

Q6. Figure Q6 shows the line spectrum of a modulated signal (all components are positive and real). 3 1 232 234 236 238 frequency/kHz Figure Q6: Line spectrum of a modulated signal (a) Describe the modulation scheme. (b) What are the values of the carrier frequency, modulation frequency and the modulation index? (c) What is the transmission efficiency (ratio of modulated to total power) in this example? (d) The reception of this signal is undertaken with a superheterodyne detector using an intermediate frequency of 110 kHz. What is the appropriate local oscillator frequency? (e) Demodulation of this type of signal is usually accomplished using an envelope detector. Describe the principles of operation of an envelope detector and sketch an example circuit. (f) What considerations should be made about the component values in the design of an envelope detector in order to demodulate the signal after shifting to the intermediate frequency? Relative unitsS

H.W A carrier signal given by 10cos27×108t volt is FM modulatedby single tone message 4cos2nx103t voltif the modulation constantis 1000 HzlVolt a) Compute max. frequency deviation and deviation ratio. b) Write the equation of modulatedwave. c) Sketch the spectrum. d) Calculate sidebands carrierand total power.