A detailed study on the amplitude modulation using Multisim softwareFull description
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Modulation d Amplitude CPF0708
THIS FILE CONTAINS QUESTIONS WITH ANSWER ON THE AM MODULATION TOPIC. CALCULATION.Deskripsi lengkap
Laporan Praktek Teknik Transmisi Jobsheet PAM
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Laporan Praktek Teknik Transmisi Jobsheet PAM
AM Radio Simulator
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Experiment on AM indexFull description
Amplitudo Modulation
LAB REPORT AMPLITUDE MODULATION
NAME
:
STU. ID No
:
Group
:A
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Output Wave forms.
Fm(t) signa
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Output "a#$ %oms o&s$r#$' & os!ios!op$
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*ON*LUSION •
Observed how the Timedomain signal and the frequency donation s ignal of Amplitude Modulated signal behaved.
DIS*USSION
Modulation indices are described for various forms of modulation. The amplitude modulation, AM, modula mod ulatio tion n ind inde e can be def define ined d as the measure measure of etent etent of amp amplit litude ude variation variation about an un! modulated carrier. As with other modulation indices, the modulation inde for amplitude modulation, AM, indicates the amount by which the modulated carrier varies around its static un!modulated level. A complementary figure to modulation inde is also used for amplitude modulation signals. "nown as the modulation depth, it is typically the modulation inde epressed as a percentage. Typically the modulation inde of a signal will vary as the modulating signal intensity varies. #owever some static values enable the various levels to visuali$ed more easily.
Ampitu'$ mo'uat$' in'$+ o% ,.-
When the modulation inde reaches %.&, i.e. a modulation depth of %&&', the carrier level falls to $ero and rise to twice its non!modulated level.
Ampitu'$ mo'uat$' in'$+ o% .,
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roadcast stations in particular ta-e measures to ensure that the carries of their transmissions never become over modulated. The transmitters incorporate limiters to prevent more than %&&' modulation. #over they also normally incorporate automatic audio gain controls to -eep the audio levels such that near %&&' modulation levels are achieved for most of the time.ingle sideband modulation can be viewed as an amplitude modulation signal with elements removed or reduced. /n order to see how single sideband is created, it is necessary to use an amplitude modulated signal as the starting point.
0rom this it can be seen that the signal has two sidebands, each the mirror of the other, and the carrier. To improve the efficient of the signal, both in terms of the power and spectrum usage, it is possible to remove the carrier, or at least reduce it, and remove one sideband ! one is the mirror image of the other. A single sideband signal therefore consists of a single sideband, and often no carrier, although the various variants of single sideband are detailed below.
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/t can be seen that either the upper sideband can be used. There is no between using either the upper or lower main criterion is to use the same sideband users for the given frequency band and upper sideband is more commonly used applications.
signas
sideband or lower advantage sideband. The as used by other application. The for professional