introduction to analog modulation analysis
TRANSCRIPT
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RIGOL TECHNOLOGIES,INC.
Introduction to Analog Modulation Analysis
Edward Pan
Rev.1.0
2017-OCT
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Basic Concept
AM/FM ModulationAM/FM modulation technology is one kind of traditional analog modulation
in Radio communication system. It uses variable amplitude carieer to
modulate the original signal. Like the voice or Audio signal, usually uses
AM modulation technology before, but it still has some shortcoming
because the signal is easily interfered by other analog signals, so it is not
common used in today’s communication system, but AM modulation is still
the standard case in School Lab.
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Feature/Advantage/Benefit
Feature:1. Use DSG3060 RF Signal Generator + DSA875 Spectrum Analyzer
Advantage:1. High DANL Specfication on DSA875.
2. Multiple and diversified measurement function on DSA875.
Benefit:1. Fast capture the AM modulation spectro-lines.
2. Find the AM modulation line spacing easily.
3. Peak table can easily sorted the measurement data.
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Required Equipment List
1. DSA875/832/832E/815 Spectrum Analyzer
2. DSG3060/3030/830/815 RF Signal Generator
3. DSA Utility Kit
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AM modulation measurement Setup
1. Connect the SMA cable between DSA875 and DSG3060
2. Press “Preset” button on both DSA875 and DSG3060
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AM modulation measurement Setup
DSG3060 Setup:
3. Press “FREQ” button and set the frequency to 500MHz.
4. Press “LEVEL” button and set the level to -10dBm.
5. Press “AM” button and set the freq to 100KHz.
6. Select Switch item and enable “On”.
7. Press “MOD” and “RF” button on.
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AM modulation measurement Setup
DSA875 Setup:
8. Press “FREQ” button and set the center frequency to 500MHz.
9. Press “SPAN” button and set the span to 1MHz.
10. Press “BW/Det” and set the RBW to 3KHz. The AM Modulation
spectrum can be shown on Display as below diagram.
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AM modulation measurement Setup
DSA875 Setup:
11. Press “Marker” and you can see the frequency and power information
is shown on left side of display.
12. Press “Peak” and set to Peak Right item, you can see the AM
modulation spectrum spacing is 100KHz.
100MHz
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AM modulation measurement Setup
DSA875 Setup:
13. Change to next page and select Peak Table and switch the state to
“On”.
14. Press Pk Readout item and select >DL. You can adjust the display
limit line to sort your result criteria as you like.
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FM demodulation Setup
1. Connect the Radio Antenna to DSA815 Spectrum Analyzer.
2. Press “Preset” button on DSA815 and back to default setup.
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FM demodulation Setup
3. Press “FREQ” and setup the center frequency to 103.3MHz.
4. Press “SPAN” and setup the span value to 500KHz.
5. Press”BW/Det” and setup the RBW to 1KHz, then you can see the FM
spectrum as below diagram indicated.
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FM demodulation Setup
6. Press “Marker” and the frequency and power level is shown on Display.
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FM demodulation Setup
7. Press “Demod” and select the “FM” item
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FM demodulation Setup
7. Press “Demod Setup”.
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FM demodulation Setup
7. Select “Earphone” item to “On” and connect the earphone to spectrum
Analyzer as below indicated. Users can hear the FM radio program in
earphone.
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THANK YOU