(c) An AM radio station broadcasts music with an absolute bandwidth of 5 kHz. The stationuses double-sideband, transmitted-carrier modulation and its carrier frequency is 1 MHz. (i) What are the minimum and maximum frequency limits, flow and fhigh, of the bandwidthin positive frequency space occupied by the modulated carrier that is broadcast by this station? (ii) If the carrier frequency is changed to 1.5 MHz, what are the new minimum and maximum frequency limits, flow and fhigh, of the bandwidth in positive frequency space occupied by the modulated carrier that is broadcast by this station? (iii) If the station changed to single-sideband suppressed-carrier modulation, broadcasting theupper sideband only (in positive frequency space) and the carrier frequency were the original 1 MHz, what are the new minimum and maximum frequency limits, flow and fhigh, of the bandwidth in positive frequency space occupied by the modulated carrier thatis broadcast by this station?

(c) An AM radio station broadcasts music with an absolute bandwidth of 5 kHz. The stationuses double-sideband, transmitted-carrier modulation and its carrier frequency is 1 MHz. (i) What are the minimum and maximum frequency limits, flow and fhigh, of the bandwidthin positive frequency space occupied by the modulated carrier that is broadcast by this station? (ii) If the carrier frequency is changed to 1.5 MHz, what are the new minimum and maximum frequency limits, flow and fhigh, of the bandwidth in positive frequency space occupied by the modulated carrier that is broadcast by this station? (iii) If the station changed to single-sideband suppressed-carrier modulation, broadcasting theupper sideband only (in positive frequency space) and the carrier frequency were the original 1 MHz, what are the new minimum and maximum frequency limits, flow and fhigh, of the bandwidth in positive frequency space occupied by the modulated carrier thatis broadcast by this station?

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. The Voltage spectrum of FM signal is shown in Figure 1. The maximum amplitude of modulating signal is 5V. Calculate the bandwidth , modulation index ,Carrier frequency, modulating frequency and specify the type of Modulator(narrow band or wide band). 1.54 4.06 4.06 2.45 2.45 0.91 0.91 0.21 0.21 192 194 196 198 200 202 204 206 208 KHz
1. The Voltage spectrum of FM signal is shown in Figure 1. The maximum amplitude of modulating signal is 5V. Calculate the bandwidth , modulation index „Carrier frequency, modulating frequency and specify the type of Modulator(narrow band or wide band). 1.54 4.06 4.06 2.45 2.45 0.91 0.91 0.21 0.21 192 194 196 198 200 202 204 206 208 KHZ Figure 1 Reference: (1] Fundamental of Frequency modulation, Pages 150- 163, Principles of Electronics Communication system, Louis E. Frenzel Jr. Check Moodle assignment link for book. DFocus
Q2: An FM modulator has a carrier frequency of 100 MHz, is frequency modulated by wave signal at a frequency of (fm = 9 kHz). The resultant FM signal has a free deviation of (Af = 45 kHz). (fagrees) M-FM 1. Calculate the modulation index for the wave? Which type this FM modulati- why? 2pf 2. Determine the highest and lowest carrier frequencies. 3. Calculate the bandwidth occupied by this FM signal. 4. Sketch the spectrum for significant sidebands. 5. Calculate the significant bandwidth: Se + Af fe - af
A 1-MHz carrier with an amplitude of 1 volt peak is modulated by a 1-kHz signal with m=0.5. Sketch the voltage spectrum. An additional 2-kHz signal modulates the carrier with m = 0.2. Sketch the voltage spectrum.
A 75 MHz carrier having an amplitude of 50 V is modulated by a 3 kHz audio signal that has an amplitude of 20 V. a. Sketch the audio signal. b. Sketch the carrier. c. Construct the modulated wave. For a, b and c - label your diagram d. Determine the modulation factor. e. What frequencies would show up in a spectrum analysis of the modulated wave? f. Write trigonometric equations for the carrier and the modulating waves. Kindly answer a-f. Please have mercy. Thanks!
Amplitude modulation is: * Change in amplitude of the carrier according to modulating signal frequency Change in amplitude of the carrier according to modulating signal Change in frequency of the carrier according to modulating signal Change in amplitude of the modulating signal according to carrier signal
D Page view A Read aloud (b) Find a PM modulated signal when k, = 10 (c) Determine the modulation index and maximum frequency deviation of FM modulated signal. (d) Determine the modulation index and maximum phase deviation of PM modulated signal. Problem 2: The message signal m(t) = 10 cos(2000nt) angle modulates the carrier signal c(t) = cos(2nfct), where f. = 10 kHz. %D (a) Find an FM modulated signal when k, = 200 (b) Find a PM modulated signal when k, = 10 (c) Determine the modulation index and maximum frequency deviation of FM modulated signal. (d) Determine the modulation index and maximum phase deviation of PM modulated signal.
Since a,b,c have already been answered. Just answer the remaining d, e, f. Thanks! A 75 MHz carrier having an amplitude of 50 V is modulated by a 3 kHz audio signal that has an amplitude of 20 V. a. Sketch the audio signal. b. Sketch the carrier. c. Construct the modulated wave. For a, b and c - label your diagram d. Determine the modulation factor. e. What frequencies would show up in a spectrum analysis of the modulated wave? f. Write trigonometric equations for the carrier and the modulating waves.
Question 4 a. AM modulation is inefficient. With reference to the frequency domain, explain why. How does double sideband and single sideband suppressed carrier modulation improve the efficiency of AM modulation? Despite its increased efficiency, what is a disadvantage of SSB-SC when compared with AM modulation. b. An antenna has an impedance of 75 N. An unmodulated AM signal produces a current of 3.4A. The modulation is 90 percent. Calculate (a) the carrier power, (b) the total power, and (c) the sideband power. c. With aid of diagrams, explain how frequency modulation works.
• Discussion: 1. Define modulation. 2. Explain why modulation is necessary or desirable. 3. Define: a) The circuit that causes one signal to modulate another, and give the names of the two signals applied to this circuit. b) What is the name given to the new signals generated by the modulation process. 4. Are these statements true or false. Explain your answer a) The carrier frequency is usually lower than the modulating frequency. b) The carrier frequency remains constant during AM. c) The carrier of an AM signal contains information. 5. Explain why the modulation is linear in amplitude modulation system. 6. Explain the reason for making the modulation index (m) less than unity in DSB_LC modulation. 7. What percentage of the total power in an AM signal is in the carrier, one sideband, and both sidebands. 8. Write the trigonometric expression for a sine wave carrier signal.
H.W A carrier signal given by 10cos27×108t volt is FM modulatedby single tone message 4cos2nx103t voltif the modulation constantis 1000 HzlVolt a) Compute max. frequency deviation and deviation ratio. b) Write the equation of modulatedwave. c) Sketch the spectrum. d) Calculate sidebands carrierand total power.
1. A 1500-kHz carrier and kHz intelligence signal are combined in a nonlin-ear device. List all the frequency components produced. *2. If a 1500-kHz radio wave is modulated by a 2-kHz sine-wave tone, what frequencies are contained in the modulated wave (the actual AM signal)? *3. If a carrier is amplitude-modulated, what causes the sideband frequencies? *4. What determines the bandwidth of emission for an AM transmission? *10. What are some of the possible results of overmodulation? *11. An unmodulated carrier is 300 V p-p. Calculate %m when its maximum p-p value reaches 400, 500, and 600 V. (33.3%, 66.7%, 100%) 12. If V and V as shown in Figure 8, determine %m. (53.85%) 13. Determine and from Problem 12. ( Vpk, Vpk)