Question

A transmitter radiates $10kW$ of power with the carrier unmodulated and $11.8kW$ with the carrier sinusoidally modulated. The modulation factor is

• A. $56\%$
• B. $60\%$
• C. $72\%$
• D. $84\%$

Answer 1

Answer: (B)

$60\%$

$P_c=P_t(1+\frac{m^2}{2})$
$⟹11.8=10(1+\frac{m^2}{2})$
$⟹m=0.6⟹\%modulation=60\%$