RF Communication and Signals Experiments
Figure 5-3.
Spectrum of an
AM wave
U
cm
1/ 2 m
a
U
cm
1/ 2 m
a
U
cm
c
−
ω Ω
c
ω
c
ω + Ω
From the above analysis, we can understand that amplitude
modulation is a process of shifting a low frequency modulating
signal into the sideband of a high frequency carrier. Obviously,
in AM waves, the carrier does not contain any useful
information. Information is only included in the sidebands.
Experiment
contents
1.
Measure the waveform and spectrum of an AM wave.
2.
Measure the spectrum of the AM wave with different carrier
frequencies and with modulating signals with different
amplitudes.
1.
Turn on the power to the GRF-1300 and GSP-730.
2.
Set the GRF-1300 as follows:
•
Set the GRF-1300 to the default power-on state.
•
Connect the output port on the Baseband module to the AM
in port on the AM module with an RF cable.
•
Connect the RF/FM output port on the RF Synthesizer/FM
to the RF in port on the AM module with an RF cable.
•
Turn the potentiometer clockwise to the end.
Experiment
steps
3.
Connect the AM output port to the input port of the spectrum
analyzer with the 800mm RF cable.
61
Summary of Contents for GRF-1300
Page 15: ...Introduction to the GRF 1300 Figure A 10 Operation interface for HyperTerminal 13 ...
Page 19: ...Overview of the Time and Frequency Domain Time domain Frequency domain 17 ...
Page 20: ...GRF 1300 User Manual and Teaching Materials NOTES 18 ...
Page 21: ...Overview of the Time and Frequency Domain NOTES 19 ...
Page 22: ...GRF 1300 User Manual and Teaching Materials NOTES 20 ...
Page 23: ...Overview of the Time and Frequency Domain NOTES 21 ...
Page 24: ...GRF 1300 User Manual and Teaching Materials 22 NOTES ...
Page 30: ...GRF 1300 User Manual and Teaching Materials NOTES 28 ...
Page 31: ...An Introduction to Spectrum Analyzers NOTES 29 ...
Page 56: ...GRF 1300 User Manual and Teaching Materials NOTES 54 ...
Page 57: ...RF Communication and Signals Experiments NOTES 55 ...
Page 58: ...GRF 1300 User Manual and Teaching Materials NOTES 56 ...
Page 59: ...RF Communication and Signals Experiments NOTES 57 ...
Page 95: ...RF Communication and Signals Experiments 10MHz frequency deviation test results 93 ...
Page 101: ...Test for Learning Outcomes NOTES 99 ...
Page 102: ...GRF 1300 User Manual and Teaching Materials NOTES 100 ...
Page 103: ...Test for Learning Outcomes NOTES 101 ...
Page 104: ...GRF 1300 User Manual and Teaching Materials 102 NOTES ...
Page 109: ...Appendix Modulation Index and Sideband Amplitude Comparison Table 107 ...