A message signal of frequency 20 KHz and peak voltage of 20 volts is used to modulate a carrier signal of frequency 2 MHz and peak voltage of 40 volts. Determine (i) modulation index, (ii) the side bands produced. Draw the corredponding frequency spectrum of amplitude modulated signal.
(i) modulation index =
The side bands are (2000+20) KHz
=2020 KHz and (2000-20)KHz
= 12980 KHz (1/2 +1/2) mark
Amplitude versus w for amplitude modulated signal: page number 525 NCERT part (ii) Figure (1) marks