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Q. $1000 \,kHz$ carrier wave is amplitude modulated by the signal frequency $200 - 4000 \,Hz$. The channel width of this case is

JIPMERJIPMER 2014Communication Systems

Solution:

Bandwidth is equal to twice the frequency of modulating signals.
Therefore,
Band width $=2\upsilon_{m}$
$= 2 × 4000 \,Hz = 8 × 10^{3}\, Hz = 8\, kHz$