Question
A FM Broad cast transmitter, using modulating signal of frequency $20\,kHz$ has a deviation ratio of $10$. The Bandwidth required for transmission is $.......kHz$
✓
Answer
Given
FM broadcast
Modulating frequency $=20\,k Hz = f$
Deviation ratio $=\frac{\text { frequency deviation }}{\text { modulating frequency }}=\frac{\Delta f}{ f }$
$\Rightarrow$ frequency deviation $-\Delta f = f \times 10$
$=20\,kHz \times 10=200\,kHz$
$\Rightarrow$ Bandwidth $=2( f +\Delta f )$
$=2(20+200)\,kHz$
$=440\,kHz$
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