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which is better in short range commn AM or FM? and why
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Answer Posted / vkabes
for short range of communication FM is better because noise
level is very low in fm rather than am. signal to noise
ratio is very high in fm when compared to am. the
modulation index is very high for fm so the signal to noise
ratio is [3/2(MI)^2] so fm is better for short range of
communication.
but the power of fm is always less(power of carrieritself
regardless of the modulation index) as compared to am(max
3(power of carrier)/2).so the range of fm is less than am.
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