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An audio signal of 3.2 kHz modulates a c...

An audio signal of 3.2 kHz modulates a carrier of frequency 84 kHz and producer a deviation of 96kHz. Find (i) frequency modulation index and (ii) frequency range of the FM wave.

Text Solution

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Here, `v_m = 3.2 kHz`.
`v_c = 84MHz = 84 xx 10^3 kHz`
Frequency deviation, `delta = 96 kHz.`
Frequency modulation index,
`m_f = delta/v_m = 96/3.2 = 30`
Frequency range of modulated wave ltbr. `= v_c +- v_m`
` = (84 xx 10^3 +-3.2) kHz`.
`= 83,997 kHz to 84,003 kHz.`
`= 83.997 MHz ti 84.003 MHz`.
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