Figure (1) shows the block diagram of a wideband frequency modulator using the indirect method. This modulator is used to transmit audio signals containing frequencies in the range of 100 Hz to 15 kHz. The narrowband is supplied with a carrier of frequency fl=0.1 MHz by crystal- controlled oscillator also ß=0.2, a second crystal- controlled oscillator supplied a sinusoidal wave of frequency 9.5 MHz to the mixer. The system Carrier frequency at the transmitter output, fc=100MHZ Minimum frequency deviation, Af=75, find n1 and n2? Freq. Multiplier 1 Freq. Multiplier 2 NBFM f(t) Mixer fr(t) Oscillator1 Fig.(1) Oscillator2
Figure (1) shows the block diagram of a wideband frequency modulator using the indirect method. This modulator is used to transmit audio signals containing frequencies in the range of 100 Hz to 15 kHz. The narrowband is supplied with a carrier of frequency fl=0.1 MHz by crystal- controlled oscillator also ß=0.2, a second crystal- controlled oscillator supplied a sinusoidal wave of frequency 9.5 MHz to the mixer. The system Carrier frequency at the transmitter output, fc=100MHZ Minimum frequency deviation, Af=75, find n1 and n2? Freq. Multiplier 1 Freq. Multiplier 2 NBFM f(t) Mixer fr(t) Oscillator1 Fig.(1) Oscillator2
Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Transcribed Image Text:Figure (1) shows the block diagram of a wideband frequency modulator using the
indirect method. This modulator is used to transmit audio signals containing
frequencies in the range of 100 Hz to 15 kHz. The narrowband is supplied with a
carrier of frequency fl=0.1 MHz by crystal- controlled oscillator also B=0.2, a second
crystal- controlled oscillator supplied a sinusoidal wave of frequency 9.5 MHz to the
mixer. The system Carrier frequency at the transmitter output, fc=100MHZ Minimum
frequency deviation, Af=75, find nl and n2?
Freq.
Multiplier 1
Freq.
Multiplier 2
f(t)
NBFM
Mixer
fEM(t)
Oscillator1
Fig.(1)
Oscillator2
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