Question

A carrier wave is modulated by a number of sine waves with modulation indices 0.1, 0.2, 0.3. The total modulation index (m) of the wave is

• A. 0.6
• B. 0.2
• C. $\sqrt{0.14}$
• D. $\sqrt{0.07}$

Answer 1

Answer: (C)

$\sqrt{0.14}$

Modulated Index $=\sqrt{m_1^2+m_2^2+...}=\sqrt{{0.1}^2+{0.2}^2+{0.3}^2}=\sqrt{0.14}=0.374$