Figure 1. Shows the block diagram of a wideband frequency modulator using the indirectmethod. This modulator is used to transmit a voice signals containing frequencies in therange 300 Hz - 3 KHz. The narrowband phase modulator is supplied with a carrier offrequency fi = 0.2 MHz by crystal controlled oscillator, carrier frequency at the transmitteroutput, fe = 200 MHz, minimum frequency deviation, Af = 120 KHz. Maximummodulation index, ß = 0.3 radians, (consider B = 0.2 radian which certainly satisfies therequirements)(a) Calculate the frequency multiplication n2(b) Calculate the carrier frequency for the second control oscillator f2.(c) Specify the values of carrier frequency and frequency deviation at the various points inthe modulator.FrequencymultiplierFrequencymultiplierNarrowIntegratorbandMixerphasen2Baseband signalsignalFMmodulatorNi - 50CrystalCrystalcontrolledcontrolledoscillatoroscillatorf20.2 MHz

Write the given values. β=0.2fm=3 kHzn1=50∆fout=120 kHzfc=200 MHz

Figure 1. Shows the block diagram of a wideband frequency modulator using the indirect method. This modulator is used to transmit a voice signals containing frequencies in the range 300 Hz - 3 KHz. The narrowband phase modulator is supplied with a carrier of frequency f = 0.2 MHz by crystal controlled oscillator, carrier frequency at the transmitter output, fe = 200 MHz, minimum frequency deviation, Af = '120 KHz. Maximum modulation index, ß = 0.3 radians, (consider ß = 0.2 radian which certainly satisfies the requirements) (a) Calculate the frequency multiplication n2 (b) Calculate the carrier frequency for the second control oscillator f2. (c) Specify the values of carrier frequency and frequency deviation at the various points in the modulator. Frequency multiplier Frequency multiplier Narrow Integrator band Mixer phase Baseband signal signal ni - 50 FM modulator Crystal Crystal controlled controlled ocillator oscillator f2 0.2 MHz

Figure 1. Shows the block diagram of a wideband frequency modulator using the indirect method. This modulator is used to transmit a voice signals containing frequencies in the range 300 Hz - 3 KHz. The narrowband phase modulator is supplied with a carrier of frequency f = 0.2 MHz by crystal controlled oscillator, carrier frequency at the transmitter output, fe = 200 MHz, minimum frequency deviation, Af = '120 KHz. Maximum modulation index, ß = 0.3 radians, (consider ß = 0.2 radian which certainly satisfies the requirements) (a) Calculate the frequency multiplication n2 (b) Calculate the carrier frequency for the second control oscillator f2. (c) Specify the values of carrier frequency and frequency deviation at the various points in the modulator. Frequency multiplier Frequency multiplier Narrow Integrator band Mixer phase Baseband signal signal ni - 50 FM modulator Crystal Crystal controlled controlled ocillator oscillator f2 0.2 MHz

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.

Question

Figure 1. Shows the block diagram of a wideband frequency modulator using the indirect
method. This modulator is used to transmit a voice signals containing frequencies in the
range 300 Hz - 3 KHz. The narrowband phase modulator is supplied with a carrier of
frequency fi = 0.2 MHz by crystal controlled oscillator, carrier frequency at the transmitter
output, fe = 200 MHz, minimum frequency deviation, Af = 120 KHz. Maximum
modulation index, ß = 0.3 radians, (consider B = 0.2 radian which certainly satisfies the
requirements)
(a) Calculate the frequency multiplication n2
(b) Calculate the carrier frequency for the second control oscillator f2.
(c) Specify the values of carrier frequency and frequency deviation at the various points in
the modulator.
Frequency
multiplier
Frequency
multiplier
Narrow
Integrator
band
Mixer
phase
n2
Baseband signal
signal
FM
modulator
Ni - 50
Crystal
Crystal
controlled
controlled
oscillator
oscillator
f2
0.2 MHz

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