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Q.

A 1000 KHz  carrier is simultaneously modulated with fm1=300Hz,  fm2=800Hzand fm3=1kHz audio sine wave. What will be the frequencies present in the o/p?(A)fLSB1=999.7kHz , fUSB1=1000.3kHz(B) fLSB2=999.2kHz , fUSB2=1000.8kHz(C) fUSB3=999kHz , fUSB3=1001kHz(D) fUSB3=990kHz , fUSB3=1010kHz

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a

A Only

b

B, C, D

c

A, B, C

d

A, C only

answer is C.

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Detailed Solution

fc−fm1=1000 −0.3=999.7 kHz,      fc +fm1=1000 +0.3=1000.3 kHz fc−fm2=1000 −0.8=999.2 kHz,      fc +fm2=1000 +0.8=1000.8 kHz fc−fm3=1000 −1=999 kHz,      fc +fm1=1000 +1=1001 kHz
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