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Full Wave Rectifier

12 signals ea...

Question

12 signals each band limited to $5 k H z$ are to be transmitted by frequency-division multiplexer. If AM-SSB modulation guard band of $1 k H z$ is used then the bandwidth of multiplexed signal is

A

101 k H z

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B

99 k H z

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C

84 k H z

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D

71 k H z

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Solution

The correct option is C $71 k H z$
Total signal B.W $= 12 \times 5 = 60 k H z$
11 guard band are required between 12 signal.
$∴$ Guard bandwidth $= 11 \times 1 k H z = 11 k H z$
$∴$ Total bandwidth $60 + 11 = 71 k H z$

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