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1: For the sinusoidaly modulated DSB/LC waveform shown in Fig. below. a- Find the modulation index. b- Sketch a line spectrum. c- Calculated the ratio of average power in the sidebands to that in the carrier." d- Determine the amplitude of the additional carrier, which must be added to obtain a modulation index of 10% D(t) 100v 50v Ans: (a) 0.33 (b)0.055. -50v -100v (d) 17s v.

1: For the sinusoidaly modulated DSB/LC waveform shown in Fig. below. a- Find the modulation index. b- Sketch a line spectrum. c- Calculated the ratio of average power in the sidebands to that in the carrier." d- Determine the amplitude of the additional carrier, which must be added to obtain a modulation index of 10% D(t) 100v 50v Ans: (a) 0.33 (b)0.055. -50v -100v (d) 17s v.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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1 Messenger .ll 20:17 © 73% (CH 4) Amplitude Modulation By Dr. Hikmat Al-Shamary & Dr. Tariq M. Salman Problem Sheet for Amplitude Modulation Q1: For the sinusoidaly modulated DSB/LC waveform shown in Fig. below. a- Find the modulation index. b- Sketch a line spectrum. c- Calculated the ratio of average power in the sidebands to that in the carrier. d- Determine the amplitude of the additional carrier, which must be added to obtain a modulation index of 10% D(t) 100v 50v Ans: (a) 0.33 0- (b)0.055. -50v -100v (d) 17s v. Q2: A given AM (DSB-LC) transmitter develops an unmodulated power output of 1 kW. Across 502 resistive load. When a sinusoidal test tone with a peak amplitude of 5v is applied to the input of the modulator, it is found that the spectral line for each sideband in the magnitude spectrum for the output is 40% of the carrier line. Determine the following quantities in the output signal: a-The modulation index. b-The peak amplitude of the lower sideband. c-The ratio of total side band power to carrier power. d-The total output power. 110
Transcribed Image Text:1 Messenger .ll 20:17 © 73% (CH 4) Amplitude Modulation By Dr. Hikmat Al-Shamary & Dr. Tariq M. Salman Problem Sheet for Amplitude Modulation Q1: For the sinusoidaly modulated DSB/LC waveform shown in Fig. below. a- Find the modulation index. b- Sketch a line spectrum. c- Calculated the ratio of average power in the sidebands to that in the carrier. d- Determine the amplitude of the additional carrier, which must be added to obtain a modulation index of 10% D(t) 100v 50v Ans: (a) 0.33 0- (b)0.055. -50v -100v (d) 17s v. Q2: A given AM (DSB-LC) transmitter develops an unmodulated power output of 1 kW. Across 502 resistive load. When a sinusoidal test tone with a peak amplitude of 5v is applied to the input of the modulator, it is found that the spectral line for each sideband in the magnitude spectrum for the output is 40% of the carrier line. Determine the following quantities in the output signal: a-The modulation index. b-The peak amplitude of the lower sideband. c-The ratio of total side band power to carrier power. d-The total output power. 110
H.W: Thirty signals, twenty of them have 4 kHz bandwidth, the other have bandwidth of 3 kHz are FDM/TDM multiplexed then modulated by a n RI carricr of 800 kHz using AM modulator: 1- Calculate minimum multiplexing and transmission bandwidths. 2- Calculate multiplexing and transmission bandwidths if 0.7 kHz guard band is allowed between each two signals and below the first signal.
Transcribed Image Text:H.W: Thirty signals, twenty of them have 4 kHz bandwidth, the other have bandwidth of 3 kHz are FDM/TDM multiplexed then modulated by a n RI carricr of 800 kHz using AM modulator: 1- Calculate minimum multiplexing and transmission bandwidths. 2- Calculate multiplexing and transmission bandwidths if 0.7 kHz guard band is allowed between each two signals and below the first signal.
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