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 63P
To determine
Find the total number of stations allowable in AM broadcasting band without interference with each other.
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The power radiated by an AM transmitter
for 100% modulation is 900 W. Find
the power radiated by the same AM
transmitter for 70.7% modulation.
The maximum deviation of an FM channel allowed is 15.0 kHz at frequencies up to 3.6001 kHz. Using Carson’s rule, determine the bandwidth of the FM channel. Round the final answer to two decimal places.
kHz
(b)
As an engineer, you are required to generate an FM signal using a single tone simusoidal
signal of frequency, fm with the modulation index of 1.5. Sketch the frequency spectrum
of the FM signal and determine the total power contained in the frequency range
fe -2 fm to fe +2 fm , given the carrier voltage is 12 V and the load resistor is 122.
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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- The antenna current of an AM transmitter is 8 amperes when only the carrier is sent, but it increases to 8.93 ampere when the carrier is modulated by a single sine wave. Find the percent modulation. Determine the antenna current if the percent of modulation changes to 0.8arrow_forwardThe output voltage of an AM transmitter is 40 V when sinusoidally modulated to a depth of 100%. Calculate the voltage at each side frequency when the modulation depth is reduced to 50%.arrow_forwardQuestion 2 i. An AM radio transmitter operating on 3.9 MHz is modulated by frequencies up to 4 kHz. a. What are the maximum upper and lower side frequencies? b) What is the total bandwidth of the AM signal? An AM transmitter puts a carrier of 6 A into an antenna whose resistance is 52 N. The transmitter is modulated by 60 percent. What is the total output power? ii.arrow_forward
- A broad cast AM radio transmitter radiates 125 Kw when the modulation percentage is 70 %. How much of this is a carrier power.arrow_forward2- An earth station satellite transmitter has an HPA with a rated saturated output power of 10,000 W. The back-off ratio is 6 dB, the branching loss is 2 dB, the feeder loss is 4 dB, and the antenna gain is 40 dB. Determine the actual radiated power and the EIRP.arrow_forwardNeed it fast A 2 kHz audio signal modulates a 50 MHz carrier causing a frequency deviation of 2.5 kHz. Determine the bandwidth of the FM signal.arrow_forward
- The antenna current for an AM transmitter increases by 15% over the unmodulated value when the sinusoidal modulation is applied. Find the depth of modulation.arrow_forward1. 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.arrow_forwardX. The frequency spectrum of an AM signal is shown below: 1V 5.5V 1V 59kHz 51kHz a) if the modulating signal is a sine wave, write the equation of the modulating signal b) if the carrier signal is a cosine wave, write the equation of the carrier signal c) calculate the current of the AM signal flowing through a 300-ohm loadarrow_forward
- The wavelength of life used in the transmitter is a. 680 nm b. 670nm c. 665 nm d. None of abovearrow_forward-2 o H.W: An angle modulated signal has the form: u(t) = 100 cos[2лft + 4 sin 2000л] where fc 10 MHz. 1. Determine the average transmitted power. 2. Determine the peak-phase deviation. 3. Determine the peak-frequency deviation. 4. Is this an FM or a PM signal? Explain.arrow_forward3. What is the wavelength of radio station WMAL which broadcasts FM (frequency modulation) at a frequency of 107.3 kHz?arrow_forward
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