MCQ
In $AM$ , the centpercent modulation is achieved when
- ✓Carrier amplitude $=$ signal amplitude
- BCarrier amplitude $\neq$ signal amplitude
- CCarrier frequency $=$ signal frequency
- DCarrier frequency $\neq$ signal frequency
✓
Answer
Correct option: A.
Carrier amplitude $=$ signal amplitude
a
(a) When signal amplitude is equal to the carrier amplitude, the amplitude of carrier wave varies between $2A$ and zero.
${m_a} = \frac{{{\rm{Amplitude \,charge\, of\, carrier}}}}{{{\rm{Amplitude\, of \,normal \,carrier}}}} = \frac{{2A - A}}{A} \times 100 = 100\% $
(a) When signal amplitude is equal to the carrier amplitude, the amplitude of carrier wave varies between $2A$ and zero.
${m_a} = \frac{{{\rm{Amplitude \,charge\, of\, carrier}}}}{{{\rm{Amplitude\, of \,normal \,carrier}}}} = \frac{{2A - A}}{A} \times 100 = 100\% $
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