For the data given Q. 52 what will be the new bandwidth,

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For the data given Q. 52 what will be the new bandwidth, if modulating signal amplitude is doubled?

1. 170 kHz
2. 190 kHz
3. 320 kHz
4. 340 kHz

Correct Option: C

When the modulating signal amplitude is doubled, the frequency deviation becomes

Δf' =	K_fA'_m	=	K_f'(2A_m)
	ω_m		ω_m

= 2Δf = 2 × 75 = 150 kHz
Now, β′ = 2(Δf ′ + f_m) = 2(150 + 10) = 320 kHz