Choose the correct answer:1. The pilot carrier is an extra signal added to a modulated AM signal, to achievemodulation. (non-coherent, coherent, an efficient, reliable).2. Which of the following is an advantage of SSB over DSB? (No change in spectrum space,Reduction in spectrum space, Carrier is suppressed, Power is not wasted on the carrier).3. The r.m.s. thermal noise voltage is proportional to(T?, T, 1/T, TI2).4. A Phase-Locked Loop (PLL) is a feedback circuit that containspass filter, VCO, all the above).5. A continuous Fourier Transform indicates aperiodic).(phase detector, low-signal. (continuous, discrete, periodic, non-

1. The pilot carrier is an extra signal added to a modulated AM signal, to achieve…

Answered: Choose the correct answer: 1. The pilot…

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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Q6. Figure Q6 shows the line spectrum of a modulated signal (all components are positive and real). 3 1 232 234 236 238 frequency/kHz Figure Q6: Line spectrum of a modulated signal (a) Describe the modulation scheme. (b) What are the values of the carrier frequency, modulation frequency and the modulation index? (c) What is the transmission efficiency (ratio of modulated to total power) in this example? (d) The reception of this signal is undertaken with a superheterodyne detector using an intermediate frequency of 110 kHz. What is the appropriate local oscillator frequency? (e) Demodulation of this type of signal is usually accomplished using an envelope detector. Describe the principles of operation of an envelope detector and sketch an example circuit. (f) What considerations should be made about the component values in the design of an envelope detector in order to demodulate the signal after shifting to the intermediate frequency? Relative unitsS
Q7. Figure Q7(a) shows the spectrum of a frequency modulated waveform with a sinusoidal modulation. 12 4.8 5.0 5.2 5.4 5.6 5.8 6.0 Frequency/MHz Figure Q7: (a) Spectrum of a frequency modulated waveform with a sinusoidal modulation. (a) Is this modulated waveform described as narrowband or as wideband? (b) What is the value of the carrier frequency? (c) What is the value of the modulation frequency? (d) Determine the value of the peak frequency deviation. Plots of Bessel functions of the first kind are provided below in Figure Q7(b) to assist you. (e) Estimate the fraction of the total signal power at the carrier frequency. (f) Detection of such a frequency modulated signal is usually accomplished with the use of a discriminator. Describe the function of a discriminator. (g) What is the equivalent AM modulation index obtained if this signal in Figure Q7(a) is demodulated with a high-pass RC filter discriminator? J„(x) 1.0 0.8 0.6 0.4 0.2 -0.2 -0.4 Figure Q7: (b) Bessel functions of the…
this question belongs to communication systems and networks.. if you could shift it to the right gentleman..thanks
The power of operating frequency in AM station is 145 W, and there is 89% modulation depth. (assuming single side band suppressed carrier). What is the power of the side bands?
i)Modulation process takes place in the modulator with two injection signals namely data orinformation and carrier. It is a vital step in generating a decent signal for electronic communication.Whenever the carrier is modulated by the information signal, new signals at different frequenciesare generated as part of the process. These new frequencies occur in the frequency spectrum withinthe range of the carrier frequency. Conclude these frequencies and mathematically explain itsgeneration with the help of diagrams. A) Upper sideband and lower broadbandB) Lower sidefloor and upperside floorC) Lower peak and upper peakD) Upper sideband and lower sidebandE) Lower bandwidth and upper gainF) All of the aboveG) None of the above
When does maximum frequency deviation occur in an FM signal? -It occurs during the transition of the modulating signal to the opposite sign. -It occurs at the maximum amplitude point of the modulating signal. -It occurs during the maximum rate of change of the modulating signal. -It occurs at the mean point of the modulating signal.
A carrier (fc = 100MHZ, A. = 25V) is frequency modulated by the sine wave (fm = 8kHz, Am = 3V) using a frequency modulator with frequency deviation of 58kHz. Determine: %3D %3D (a) Carrier swing frequency of the output FM signal. (b) Highest and lowest sidebands' frequencies generated by the modulated signal. (c) The bandwidth of the FM signal. (d) The transmitted power through a 502 load. Ignore n(B)| < 0.1
2 (AM) A 10 V amplitude sinusoidal signal is used as a modulating signal to generate an AM signal with modulation index 0.8. What is the amplitude of the carrier? What is the power of the side bands? What is the efficiency of the modulated signal?
4. Given FM modulator with the following parameters: Frequency deviation = 44 kHz Modulating signal, vm = 2 sin (2rókt) a) Determine the modulation index. b) Determine number of sets of significant side frequencies. c) Determine the bandwidth using both Bessel function and Carson's Rule. d) Sketch the output frequency spectrum for the Bessel approximation.
Q. Choose the correct answer (.. 1. increases as the length of channel increases. (interference, distortion, additive noise, attenuation). 2. 100% modulation is produced in AM when carrier frequency exceeds signal frequency, amplitude equals signal amplitude, amplitude exceeds signal amplitude). 3. A 10 MHz carrier of peak value of 10 V is amplitude modulated by a 10 kHz signal of amplitude 5 V. The amplitude of each sideband frequency is 4. A Phase-Locked Loop (PLL) is a feedback circuit consisting of VCO, all of the above). 5. The line connecting the positive and negative peaks of the carrier waveform is called (Peak line, Maximum amplitude, Modulation index, Envelope) 6. Thermal noise power is proportional to (T², 1/T, T, T'2) 7. Which of the following is an advantage of SSB over DSB? (No change in spectrum space, Reduce in spectrum space, Carrier is suppressed, Power is not wasted on the carrier). 8. Which one of the following is not true with respect to SSB signal? (Hard to…
Q2. For the scheme shown in Figure Q2, i. Draw the spectrum of the baseband signal (multiplexer output) for the multiplexer. ii. Determine the bandwidth of the baseband signal (multiplexer output) for the multiplexer. iii. Determine the minimum transmission bandwidth of the multiplexer. Explain, briefly, the modification needed for the multiplexer in the figure to achieve this bandwidth. 3 kHz cos 10,000nt Bascband signal cos? 1000nt Σ cos 22,000rt 4 kHz cos 36,000nt Figure Q2
A carrier signal given by 10cos27x108t volt is FM modulated by single tone message 4cos27Tx103t volt if the modulation constant is 1000 Hz/Volt a) Compute max. frequency deviation and deviation ratio. b) Write the equation of modulated wave. c) Sketch the spectrum. d) Calculate sidebands carrier and total power.

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