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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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.
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)
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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- Sketch/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_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 (a)-(c) below. (a) Find the modulation index. (b) Find the signal power. (c) Find the bandwidth of the AM signal. (d) Determine the carrier frequency from the figure 20 10 0 -10 -20 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 Time (milliseconds)arrow_forward
- Figure 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_forward17arrow_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_forward
- When 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_forwardDo not copy from other websites Correct and detailed answer will be Upvoted else downvoted. Thank you!arrow_forwardDouble sideband suppressed carrierarrow_forward
- Suppose the total power of an FM signal is 7 watts. What is the power of the second sideband if the modulation index is 3? (in watts)arrow_forwardAn AM radio station using double side band transmitted carrier system employs a carrier of frequency 2.1 MHz. If the modulating signal frequency is 4 kHz, the frequencies present in the modulated carrier are: O a. 1.9 MHz, 2.1 MHz and 6.1 MHz O b. 2.1 MHz, 2.104 MHz and 2.096 MHz O c. 4 kHz, and 2.096 00 MHz and 2.1 MHz O d. 2.1 MHz and 2.104 MHzarrow_forwardMention the L1 and L2 frequency bands for GPS.arrow_forward
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Understanding Frequency Modulation; Author: Rohde Schwarz;https://www.youtube.com/watch?v=gFu7-7lUGDg;License: Standard Youtube License