A signal of frequency 20 kHz and peak voltage of 5 Volt is used to modulate a carrier wave of frequency 1 . 2 MHz and peak voltage 25 Volts . Choose the correct statement.

Question

A signal of frequency 20 kHz and peak voltage of 5 Volt is used to modulate a carrier wave of frequency 1 . 2 MHz and peak voltage 25 Volts . Choose the correct statement., Modulation index = 5 , side frequency bands are at 1400 kHz and 1000 kHz ., Modulation index = 5 , side frequency bands are at 21 . 2 kHz and 18 . 8 kHz ., Modulation index = 0 . 2 , side frequency bands are at 1220 kHz and 1180 kHz ., Modulation index = 5 , side frequency bands are at 24 . 2 kHz and 18 . 8 kHz .

MARKS App · Accepted Answer

Modulation index defines the modulated signal's ratio of maximum to minimum voltage = V m V c = 5 25 = 0.2 Carrier Frequency 1.2 × 10 3 kHz f c = 1200 kHz . Lower side-band frequency, f 1 = 1200 - 20 = 1180 KHz . Upper band frequency, f 2 = 1200 + 20 = 1220 KHz .

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