Questions
The expression for an AM voltage is . Frequencies of sideband is
detailed solution
Correct option is A
Given equation e=51+0.6Cos1000πtCos5×106πt ⇒e=(5+3Cos1000πt).Cos5×106πt Standard equation of modulating wave E=(Ec+EmCoswmt)Coswct Comparing we get, Ec=5 , Em = 3 wm = 1000π ⇒2πnm = 1000π ⇒nm=500 Hz Similarly, wc = 5×106π ⇒2πnc = 5×106π ⇒nc = 25×105 Hz Upper side band = fc+fm=nc+nm = 2500000+500 =2.5005×106Hz Lower side band = fc−fm=nc−nm =2500000-500 =2.4995×106HzTalk to our academic expert!
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A message signal of frequency 10 kHz and peak voltage of 10 volts is used to modulate a carrier of frequency 1 MHz and peak voltage of 20 volts. The side bands are 1010 kHz and______________kHz.
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