Electronics and Communication Engineering - Communication Systems - Discussion

Discussion Forum : Communication Systems - Section 5 (Q.No. 23)
23.
A message signal with bandwidth 10 kHz is lower sideband SSB modulated with carrier frequency fc1 = 106 Hz. The resulting signal is then passed though a narrow band frequency modulator with carrier frequency fc2 = 109 Hz. The bandwidth of the output would be
4 x 104 Hz
2 x 106 Hz
2 x 109 Hz
2 x 1010 Hz
Answer: Option
Explanation:

Bandwidth = 2Δf + 2B

But for NBFM, B < 1

BW ≈ 2fm 2fc1 2 x 106 Hz.

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