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 0.6Calculate 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 kwwhen the carrier is sinusoidally modulated. Calculate the modulation index. If anothersine wave corresponding 30% modulation is transmitted simultaneously, determine thetotal power radiated.

Answered: Image /qna-images/answer/5066791d-7403-4903-8c9d-3a42704992a3.jpg

Answered: 1. A broadcast transmitter radiates 20…

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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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.
Ope X. The frequency spectrum of an AM signal is shown below: 5.5V 1V 1V 52kHz 58kHz 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 load
X. 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 load
The instantaneous frequency of an FM-modulated signal will vary between fmin = 99.98MHZ And fmax = 100.02MHZ when the modulating signal is a sine wave with fm = 3KHZ .determine a. Carrier frequency (3) b. Frequency deviation c. Modulation index
42 Modulation is dune in A. Tramamitter Radio veceiver C. Between transmitter and radio receiver D. None of the above 43. At 100 modulation, the power in each sidehands in AY 50% B. 40% C. 60% D 25% 44 In a TV tranumission, picture is modulated A. Frequency B. Phase CT Amplitade D. None of the above of that of carrier. 45. Given a sine wave modulating signal, PM moduluted wave appears to be frequency modulated by cosine modulating wave. A. True B. False
36. Phase modulation is also a type of angle modulation.Group of answer choices True False 37. In FM, the amplitude and frequency of the carrier is changed in accordance with the modulating signal.Group of answer choices True False 38. Phase modulators produce maximum frequency deviation at the time that the modulating signal transitions from negative to positive values or vice versa.Group of answer choices True False 40. In PM, maximum amount of leading or lagging phase shift happens at the peak values of the modulating signal.Group of answer choices True False
Q3: A sinusoidally modulated AM waveform is shown below, Determine: 1. Peak amplitude of the upper and lower side frequencies. 2. Peak amplitude of the unmodulated carrier. 3. The modulation index and it is percentage. 4. The total power and the power efficiency. 5. Plot the frequency and the power spectrum of the modulated signal if the frequency of the carrier and the modulating signal are 2MHz and 15KHz respectively. 12 6 0 -6 -12 T
A modulating wave has a peak value of 2 volts. The carrier wave equation for the voltage is 1.2 sin(20,000t +15) V. (a) What is the modulation index? (b) What is the carrier frequency?
Which of the following is true in the spectrum of a frequency modulated wave? a. the carrier frequency disappears when the modulation index is large b. the carrier frequency cannot dissapear c. the amplitude of any sideband depends on the frequency deviation d. the total number of sidebands depend on the modulation index
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.
FM modulator is used to transmit a cosine message signal with 4V amplitude and 20Hz frequency. The carrier is a cosine signal with an amplitude of 10V and a frequency of 2000Hz. What is the power of the FM modulated signal?
8. Write the trigonometric expression for a sine wave carrier signal.

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