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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)
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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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
Transcribed Image Text: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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