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Introduction to Communication Systems

Introduction to Communication Systems James Flynn Sharlene Katz Communications System Diagram July 1, 2010 Flynn/Katz - SDR 2 Information Source and Input Transducer Transmitter Channel Receiver Output Transducer Communications System Diagram July 1, 2010 Flynn/Katz - SDR 3 Information Source and Input Transducer Transmitter Channel Receiver Output Transducer Information Source: Audio, image, text, data Input Transducer: Converts source to electric signal Microphone Camera Keyboard Communications System Diagram July 1, 2010 Flynn/Katz - SDR 4 Information Source and Input Transducer Transmitter Channel Receiver Output Transducer Output Transducer: Converts electric signal to useable form Speaker Monitor Communications System Diagram July 1, 2010 Flynn/Katz - SDR 5 Information Source and Input Transducer Transmitter Channel Receiver Output Transducer Transmitter: Converts electrical signal into form suitable for channel Modulator Amplifier Communications System Diagram July 1, 2010 Flynn/Katz - SDR 6 Information Source and Input Transducer Transmitter Channel Receiver Output Transducer Channel: Medium used to transfer signal from transmitter t

Propagation Characteristics of Radio Channels 8 Flynn/Katz - SDR July 1, 2010 Ground Wave Low MHz Waves guided between earth and ionosphere Distance of communication varies based on wavelength AM Radio (1 MHz) – propagates < 100 miles in day but longer at night Predictable propagation Sky Wave ...

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