1.

A 107.6 MHz carrier signal is frequency modulated by a 7kHz sine wave . The resultant FM signal has a frequency deviation of 50 kHz. Determine the modulation index and the carrier swing of the FM waveA. 7.143 and 100 kHzB. 8.234 and 75 kHzC. 6.289 and 150 kHzD. 5.103 and 14 kHz

Answer» Correct Answer - A
Given `, f_(c)=107.6 MHz , f_(m)=7kHz and Deltaf=50kHz `
The modulation index of the FM wave canbe given as
` m_(f)=("Frequency deviation ")/("Modulating frequency ")`
`=(Deltaf)/( f_(m))=( 50 xx 10^(3))/( 7 xx 10^(3))=7.143`
Carrier swing ` = 2 xx Deltaf = 2 xx Delta f `
` = 2 xx 50 xx 10^(3) =100 kHz `


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