Question

An oscillator is producing FM waves of frequency 2 kHz with a variation of 10 kHz. What is the modulating index

• A. 0.20
• B. 5.0
• C. 0.67
• D. 1.5

Answer 1

Answer: (B)

5.0

Answer 2

The formula for modulating index is given by $m_{f} = \frac{\delta}{\nu_{m}} = \frac{\text{Frequency variation }}{\text{Modulating frequency}} = \frac{10 \times 10^{3}}{2 \times 10^{3}} = 5$