WIII. An amplitude modulated signal has an expression: EAM 12 sin [2(800 x 10³)t] - 2 sin [2(805 x 10³)t] - 2 sin [2(795 x 10³)t], volts a) Determine equation of the modulating signal b) Sketch the frequency spectrum of the AM signal c) Calculate the total effective voltage of the modulated signal d) What is the total power needed to transmit the AM signal if a 75 ohm antenna is used

WIII. An amplitude modulated signal has an expression: EAM 12 sin [2(800 x 10³)t] - 2 sin [2(805 x 10³)t] - 2 sin [2(795 x 10³)t], volts a) Determine equation of the modulating signal b) Sketch the frequency spectrum of the AM signal c) Calculate the total effective voltage of the modulated signal d) What is the total power needed to transmit the AM signal if a 75 ohm antenna is used

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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Concept explainers

Amplitude modulation

A radio signal can carry information in the form of sound or image for broadcasting or communication. For it to be sent to a greater distance, the signal must be changed or modulated in some way. One of the easiest way is to change the amplitude of the signal with variations of the video or the audio signal. This is called Amplitude Modulaton. In this modulation information of message is carried in amplitude of carrier signal.

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VIII. An amplitude modulated signal has an expression:
CAM=12 sin [2 (800 x 10³) t] - 2 sin [2(805 x 10³)t] - 2 sin [2(795 x 10³)t], volts
a) Determine equation of the modulating signal
b) Sketch the frequency spectrum of the AM signal
c) Calculate the total effective voltage of the modulated signal
d) What is the total power needed to transmit the AM signal if a 75 ohm antenna is used

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Step 1: Determine the given variables

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Step 2: Calculation of modulation index, peak amplitude and frequency of modulating signal

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Step 3: (a) Equation of the modulating signal

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Step 4: (b) The frequency spectrum of AM signal

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Step 5: (c) The total effective voltage of the modulated signal

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Step 6: (d) Calculation of power

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