Question

100% modulation in FM means

• A. actual frequency deviation $>$ maximum allowed frequency deviation
• B. actual frequency deviation $=$ maximum allowed frequency deviation
• C. actual frequency deviation $\ge$ maximum allowed frequency deviation
• D. actual frequency deviation $<$ maximum allowed frequency deviation

Answer 1

Answer: (B)

actual frequency deviation $=$ maximum allowed frequency deviation

$m=\frac{actualfrequencydeviation}{maximumallowedfrequencydeviation}\times 100\%$
$=\frac{\left(\Delta f\right)actual}{\left(\Delta f\right)max}\times 100\%$
If, $\left(\Delta f\right)actual=\left(\Delta f\right)max$ then, $m=100\%$