TS EAMCET 18-July-2022 Shift 2 Solved Paper

Given, frequency of message signal,
fm=15‌kHz=15×103‌Hz
Let fc be the carrier frequency, then upper side band frequency =fc+fm
⇒‌‌1515=fc+fm
⇒‌‌fc+fm=1515‌‌‌⋅⋅⋅⋅⋅⋅⋅(i)
Similarly, lower side band frequency
fc−fm=1485‌‌‌⋅⋅⋅⋅⋅⋅⋅(ii)
Adding Eqs. (i) and (ii), we have
2fc=3000
⇒fc=1500‌kHz=1.5×106‌Hz=1.6‌MHz