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) $$fLSB2=999.2kHz$$ , $$fUSB2=1000.8kHz(C)$$ $$fUSB3=999kHz$$ , $$fUSB3=1001kHz(D)$$ $$fUSB3=990kHz$$ , $$fUSB3=1010kHz$$

Question

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) $$fLSB2=999.2kHz$$ , $$fUSB2=1000.8kHz(C)$$ $$fUSB3=999kHz$$ , $$fUSB3=1001kHz(D)$$ $$fUSB3=990kHz$$ , $$fUSB3=1010kHz$$

Infinity Learn · Accepted Answer

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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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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