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A message signal of 12 kHz and peak voltage 20 V is used to modulate a carrier wave of frequency 12 MHz and peak voltage 30 V. Calculate the (i) modulation index (ii) side- band frequencies. |
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Answer» Correct Answer - 0.67 ; 12.012 MHz ; 11.988MHz. Here, `v_m = 12kHz = 0.012 MHz, A_m = 20 V`. `v_C = 12 MHz, A_C = 30 V` `mu_a = A_m/A_c = 20/30 = 0.67` USB = `v_c + v_m = (12 + 0.012)MHz` `= 12.012 MHz` LSB `= v_c -v_m = (12 - 0.012)MHz` `= 11.988 MHz`. |
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