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Home / Doubts and Solutions/NEET/Physics

Q.How Amplitude modulation achieved?
B. THE FREQUENCIES OF TWOSIDE BANDS IN AN AM WAVE ARE 640KHZ AND 660KHZ RESPECTIVELY.FIND THE FREQUENCIES OF CARRIER AND MODULATING SIGNAL.WHAT IS THE BANDWIDTH REQUIRED FOR AMPITUDE MODULATION?

Asked by amitjena226 26th November 2017, 8:29 AM
Answered by Expert
Answer:
In amplitude modulation, the amplitude of the carrier wave changes in according to the information which is to be sent.
At the transmitter end the low frequency modulating signals are superimposed on high-frequency carrier wave
at the receivers end the information which is received will change in amplitude according to the biasing voltage
 
 
 
upper side of band
 
fm+fc = 660 kHz
 
lowers side of band
 
fc-fm = 640 kHz
 
adding
 
2fc=660kHz+640kHz
fc=650 kHz
 
fc+fm =660kHz
 
fm = 660 - 650=10 kHz
 
Bandwidth = upper side - lower side= (fm+fc)-(fc-fm )=2fm =2x10 kHz
Answered by Expert 27th November 2017, 4:13 PM
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