Question

A carrier is modulated simultaneously by 3 sine waves of modulation indices 0.2, 0.5 and 0.65 respectively. The net modulation index is

• A. 0.84
• B. 0.65
• C. 0.42
• D. 0.084

Answer 1

Answer: (A)

0.84

Net modulation index is given by:

$m=\sqrt{{0.2}^2+{0.5}^2+{0.65}^2}=0.84$