Fundamentals of Electric Circuits
6th Edition
ISBN: 9780078028229
Author: Charles K Alexander, Matthew Sadiku
Publisher: McGraw-Hill Education
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Chapter 18, Problem 64P
To determine
Find the total number of stations allowable in FM broadcasting band without interference with each other.
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An FM broadcast station produces a carrier swing of 90 kHz. Calculate the percentage modulation. Use max frequency deviation as per FCC rule of 75 kHz.
What major RF band does 108 MHz belong? Answer in acronym.
1. A broadcast transmitter radiates 20 kW when the modulation percentage is 75.
Calculate carrier power and power of each sidebands.
2. The total antenna current of an AM transmitter is 5 A. If modulation index is 0.6
Calculate the carrier current in antenna.
3. The RMS antenna current of AM signal increases by 15% over its unmodulated value,
when sinusoidal modulation by 1 kHz signal is applied. Determine the modulation index.
4. A certain AM transmitter radiates 10 KW with the carrier modulated, and 11.8 kw
when the carrier is sinusoidally modulated. Calculate the modulation index. If another
sine wave corresponding 30% modulation is transmitted simultaneously, determine the
total power radiated.
Chapter 18 Solutions
Fundamentals of Electric Circuits
Ch. 18.2 - Prob. 1PPCh. 18.2 - Prob. 2PPCh. 18.2 - Prob. 3PPCh. 18.3 - Prob. 5PPCh. 18.3 - Prob. 6PPCh. 18.4 - Prob. 7PPCh. 18.4 - Prob. 8PPCh. 18.5 - (a) Calculate the total energy absorbed by a 1-...Ch. 18.5 - Prob. 10PPCh. 18.8 - If a 2-MHz carrier is modulated by a 4-kHz...
Ch. 18.8 - Prob. 12PPCh. 18 - Prob. 1RQCh. 18 - Prob. 2RQCh. 18 - The inverse Fourier transform of ej2+j is (a) e2t...Ch. 18 - Prob. 4RQCh. 18 - Prob. 5RQCh. 18 - Prob. 6RQCh. 18 - Prob. 7RQCh. 18 - Prob. 8RQCh. 18 - A unit step current is applied through a 1-H...Ch. 18 - Prob. 10RQCh. 18 - Prob. 1PCh. 18 - Prob. 2PCh. 18 - Prob. 3PCh. 18 - Prob. 4PCh. 18 - Prob. 5PCh. 18 - Prob. 6PCh. 18 - Prob. 7PCh. 18 - Prob. 8PCh. 18 - Prob. 9PCh. 18 - Prob. 10PCh. 18 - Prob. 11PCh. 18 - Prob. 12PCh. 18 - Prob. 14PCh. 18 - Prob. 15PCh. 18 - Prob. 16PCh. 18 - Prob. 17PCh. 18 - Given that F=Fft, prove the following results,...Ch. 18 - Prob. 19PCh. 18 - Prob. 21PCh. 18 - Prob. 22PCh. 18 - Prob. 23PCh. 18 - Prob. 24PCh. 18 - Prob. 25PCh. 18 - Prob. 26PCh. 18 - Prob. 27PCh. 18 - Prob. 28PCh. 18 - Prob. 29PCh. 18 - For a linear system with input x(t) and output...Ch. 18 - Prob. 31PCh. 18 - Prob. 32PCh. 18 - Prob. 33PCh. 18 - Prob. 34PCh. 18 - Prob. 35PCh. 18 - Prob. 36PCh. 18 - Prob. 37PCh. 18 - Prob. 38PCh. 18 - Prob. 39PCh. 18 - Prob. 40PCh. 18 - Prob. 41PCh. 18 - Prob. 42PCh. 18 - Prob. 43PCh. 18 - Prob. 44PCh. 18 - Prob. 45PCh. 18 - Prob. 46PCh. 18 - Prob. 47PCh. 18 - Prob. 49PCh. 18 - Prob. 51PCh. 18 - Prob. 52PCh. 18 - Prob. 53PCh. 18 - Prob. 54PCh. 18 - Prob. 55PCh. 18 - Prob. 56PCh. 18 - Prob. 57PCh. 18 - Prob. 58PCh. 18 - Prob. 59PCh. 18 - Prob. 60PCh. 18 - Prob. 61PCh. 18 - Prob. 62PCh. 18 - Prob. 63PCh. 18 - Prob. 64PCh. 18 - Prob. 65PCh. 18 - Prob. 66PCh. 18 - Given a signal g(t) = sinc(200 t), find the...Ch. 18 - Prob. 68CPCh. 18 - Prob. 69CP
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- 21. FM can be produced using a phase modulator.Group of answer choices True False 22. In PM, frequency deviation is directly proportional to the amplitude of the modulating signal.Group of answer choices True False 23. The lowest frequency deviation in the carrier occurs during the zero-crossing points of the modulating signal.Group of answer choices True False 24. Modifying the frequency of the carrier produces frequency modulation.Group of answer choices True False 25. FM produced by a phase modulator is called indirect FM.Group of answer choices True False 26. The modulating signal for stereophonic subcarrier shall be equal to the sum of the left and right signals.Group of answer choices True False 27. The amplitude of the modulating signal determines the frequency deviation in the carrier.Group of answer choices True False 28. Phase shift is indirectly proportional to the amplitude of the modulating signal.Group of answer choices True False 29. Phase modulators produce a phase…arrow_forwardSketch/Draw the following: a. 100% modulation trapezoidal pattern b. Negative Carrier Shift c. Envelope of a square wave modulating a sinusoidal carrierarrow_forward(2) J The maximum shift in frequency is 3 kHz and the minimum and maximum deviation in frequency of the actual signal are 149.97 MHz and 150.03 * ?MHz. What is the carrier frequency 150 MHz 140 MHz 100 MHz 153 MHzarrow_forward
- This question is about Frequency Modulation (FM) and the Phase-Locked Loop (PLL). suppose a FM signal, 20sin(2à × 9 × 107t + 5sin1.2à × 10ªt) is applied to a 50-Q antenna. Determine: i) The carrier frequency. ii) The transmitted power. iii) Modulation index mf. iv) Intelligence frequency fi. v) BW (using Carsons rule)arrow_forwardFigure 1 shows a signal obtained after amplitude modulation by a sinusoidal message. The carrier frequency is difficult to determine from the figure, and is not needed for answering the questions below: a. Find the modulation index. b. Find the bandwidth of the AM signal. 30 20 10 0 -10 -20 -30 0 0.2 0.4 0.6 0.8 1.4 1 1.2 Time (milliseconds) Figure 1. 1.6 1.8 2arrow_forwardFM signals have all their information in ______ of the carrier.a) Amplitudeb) Magnitudec) Frequencyd) Powerarrow_forward
- In a microwave resonator, the resonant frequency is .... Given the form, the resonance mode is __________.arrow_forward3 An FM station, following FM broadcast standards, broadcasts at 105MHZ. Determine the modulation index and bandwidth of the transmitted FM signal, if the modulating signal frequency is (a) 150 Hz and (b) 1.5 kHz.arrow_forwardWhen a carrier signal is amplitude modulated by a sinusoidal signal, the antenna current of the transmitter is increased by 20% from that of an unmodulated case. The modulation index of the AM signal is equal to (Correct up to three decimal places)arrow_forward
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