high level and low level modulation pdf

High Level And Low Level Modulation Pdf

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Login Now. Low level modulation: The block diagram of a low level AM transmitter is shown below.

This post is about the generation of amplitude modulation.

Difference between low level and high level modulation

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A radio transmitter is an electronic device which, when connected to an antenna , produces an electromagnetic signal such as in radio and television broadcasting, two way communications or radar. Heating devices, such as a microwave oven , although of similar design, are not usually called transmitters, in that they use the electromagnetic energy locally rather than transmitting it to another location. A radio transmitter design has to meet certain requirements. These include the frequency of operation , the type of modulation , the stability and purity of the resulting signal, the efficiency of power use, and the power level required to meet the system design objectives. Typically a transmitter design includes generation of a carrier signal , which is normally [3] sinusoidal , optionally one or more frequency multiplication stages, a modulator, a power amplifier, and a filter and matching network to connect to an antenna. A very simple transmitter might contain only a continuously running oscillator coupled to some antenna system.

The questions posted on the site are solely user generated, Doubtnut has no ownership or control over the nature and content of those questions. Doubtnut is not responsible for any discrepancies concerning the duplicity of content over those questions. Study Materials. Crash Course. Question : Compare low level modulation and high level modulation of radio transmitters.

Compare low level modulation and high level modulation of radio transmitters

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Change in amplitude of the carrier according to modulating signal b. Change in frequency of the carrier according to modulating signal c. Change in amplitude of the modulating signal according to carrier signal d. Change in amplitude of the carrier according to modulating signal frequency. Sensitivity b.

Low level and high level modulation

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There are many ways in which amplitude modulation can be generated and a variety of circuits that can be used. In early AM transmitters the amplitude modulator circuit was a key element of the transmitter. Today with software processes and multi-mode transmitters, the amplitude modulator is likely be contained within an overall modulator circuit that is able to provide a number of different types of modulation. Nevertheless many transmitters still require AM modulators and the concepts and theory behind them is still relevant.

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