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 BW = 12 × 5 = 60 kHz 11 guard band are required between 12 signal ∴ guard bandwidth =11 × 1=11kHz ∴ total bandwidth = 60 +11= 71kHz

Q. 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

101 kHz

99 kHz

84 kHz

71 kHz

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

Q. 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

101 kHz

99 kHz

84 kHz

71 kHz

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

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