A message signal of frequency 10 kHz and peak voltage of 10 volts is used to modulate a carrier of frequency 1 MHz and peak voltage of 20 volts. Determine (a) modulation index, (b) the side bands produced.

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Solution

Modulation index $= \frac{f}{v} = \frac{10}{20} = 0.5$
Side bands are , $1000 + 10 = 1010 H z$
and $1000 - 10 = 990 H z$

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A message signal of frequency 10 kHz and peak voltage of 10 volts is used to modulate a carrier of frequency 1 MHz and peak voltage of 20 volts. Determine (a) modulation index, (b) the side bands produced.

Modulation index=fv=1020=0.5Side bands are ,1000+10=1010Hz and 1000−10=990Hz

Modulation index $= \frac{f}{v} = \frac{10}{20} = 0.5$
Side bands are , $1000 + 10 = 1010 H z$
and $1000 - 10 = 990 H z$