T 7.2.1.3 Amplitude Modulation

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TPS 7.2.1.3 Contents Note: The oscillographs in the experiment results were recorded with a HP 54600 A oscilloscope (100 MHz) and further processed with the bench link HP 34810 A software. The oscilloscope recommended in the equipment set is a low-cost version, with limited operation and display comfort (30 MHz display), but in principle delivers the same results. The experiment results given here are just examples. Therefore, the curves and results specified in the solutions section should only be taken as guidelines. The calculation and representation of the spectra was carried out with EXCEL 5.0. 4
TPS 7.2.1.3 Contents Contents Equipment overview ..............................................................................................................7 Symbols and abbreviations .................................................................................................... 8 Schrifttum .............................................................................................................................. 8 1 Introduction ......................................................................................................................... 9 Signals9 Time and spectral domain...................................................................................................... 10 Modulation ............................................................................................................................ 10 The communications system according to Shannon.............................................................. 12 2 Measuring instruments ..................................................................................................... 13 2.1 Oscilloscope and spectrum analyzer .......................................................................... 13 2.2 Equipment descriptions .............................................................................................. 16 726 94 Spectrum analyzer .......................................................................................... 16 726 961 Function generator 200kHz .......................................................................... 17 726 99 Frequency counter 0..10 MHz ...................................................................... 18 736 201 CF transmitter 20 kHz .................................................................................. 18 736 221 CF receiver 20 kHz ...................................................................................... 19 2.3 A measurement example ........................................................................................... 20 3 Review of amplitude modulation (AM) .......................................................................... 23 The spectrum of amplitude modulation ................................................................................. 24 Representing amplitude modulation with a vector diagram ................................................... 24 AM demodulation .................................................................................................................. 25 Questions ............................................................................................................................... 26 4 Required equipment and accessories ............................................................................. 28 Training objectives: ................................................................................................................ 28 5 Double Sideband-AM ........................................................................................................ 29 The DSB SC . ............................................................................................................................ 29 5.1 Investigations on the dynamic characteristic of the DSB .......................................... 30 5.1.1 DSB ............................................................................................................................ 30 5.1.2 DSB SC ................................................................................................................................................................................................................31 5.2 Spectrum of the DSB................................................................................................. 31 5.2.1 DSB ............................................................................................................................ 31 5.2.2 DSB SC ................................................................................................................................................................................................................33 5.2.3 The AM spectrum for modulation with a square-wave signal .................................. 33 5.3 AM demodulation (synchronous demodulation) ........................................................ 34 5.3.1 DSB ............................................................................................................................ 34 5.3.2 Carrier recovery ........................................................................................................ 35 5.3.3 DSB SC Demodulation ................................................................................................. 37 5.4 Beats .......................................................................................................................... 37 5
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TPS 7.2.1.3 Solutions because high
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TPS 7.2.1.3 Solutions 5.3.2 Carrier
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TPS 7.2.1.3 Solutions If harmonic s
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TPS 7.2.1.3 Solutions 6.2.2 SSB sc
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TPS 7.2.1.3 Solutions Observation:
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TPS 7.2.1.3 Keywords Keywords AM de
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T 7.2.1.3 Amplitude Modulation

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