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

Question

12 signals each band limited to 5 kHz are to be transmitted by frequency-division multiplexer. If AM-SSB modulation guard band of 1 kHz is used then the bandwidth of multiplexed signal is (A) 101 kHz (B) 99 kHz (C) 84 kHz (D) 71 kHz

Tardigrade Admin · Accepted Answer

Total signal B.W =12 × 5=60 kHz 11 guard band are required between 12 signal ∴ guard bandwidth =11 × 1 kHz =11 kHz ∴ total bandwidth =60+11=71 kHz

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

101 kHz

99 kHz

84 kHz

71 kHz

Total signal B.W $= 12 \times 5 = 60 k Hz$
$11$ guard band are required between $12$ signal
$∴$ guard bandwidth $= 11 \times 1 k Hz = 11 k Hz$
$∴$ total bandwidth $= 60 + 11 = 71 k Hz$

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