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Super Heterodyne Receiver - Assignment Example

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Super Heterodyne Receiver

Contents Contents 3 1.Introduction: 4 2.Super Heterodyne Receiver: Theory: 5 2.1.Structure of Super Heterodyne Receiver: 7 3.Super Heterodyne Receiver: Features: 9 4.Super Heterodyne FM (Frequency Modulation) Receiver: 11 5.Super Heterodyne Receiver: Applications: 12 6.Advantages and Disadvantages of Super Heterodyne Receivers: 13 7.Conclusion: 13 References 14 Appendices 16 List of Figures Serial No. Figure Page No. Figure 1 Block diagram of super heterodyne radio receiver 7 Figure 2 Structure of the Super Heterodyne Receiver 8 Figure 3 Super Heterodyne FM Receiver 12 List of Tables Serial No. Table Page No. Table 1 The Basic Elements of Super Heterodyne Radio Receiver 9 Table 2 Electrical Characteristics of AM Super Heterodyne Receiver 10 Table 3 Advantages and Disadvantages of Super Heterodyne Receivers 13 List of Appendices Serial No. Appendix Page No. Appendix A Signals generated by mixing two signals together 17 1. Introduction: A super heterodyne receiver is defined as a radio receiver where two signals of radio-frequencies are combined by an action of a heterodyne delivering a signal that exceeds the limit of frequency that is audible. Amplification and demodulation of this produced signal produces a desired signal of audio-frequency. A super heterodyne receiver is also called as superhet (Superheterodyne receiver). The primary objective of super heterodyne receiver is production of an intermediate frequency on a constant basis such that efficiency of amplification and uniform selectivity, along with uniform sensitivity can be obtained (Thomas and Sekhar 313). The design of the receiver is usually such that it has a very good power of sensitivity thereby allowing even weak signals to deliver an output that can be considered as significant. However, there are problems with the receiver as well particularly when a strong station is tunes in to by anyone, a high gain occurs as a result of which amplifiers become overloaded causing poor and distorted intelligence of the receiver to deliver the desired signals (Thomas and Sekhar 313). The present study focuses on an understanding the theory and working of the super heterodyne receiver, thereby learning about its circuit, its features, its advantages and disadvantages and its applications. 2. Super Heterodyne Receiver: Theory: The super heterodyne receiver is one of the most popular radio receivers of the present times. It was invented during the end of the First World War by Edwin Armstrong, an American. Since them the use of the receiver has extensively increased in broadcast radios, televisions, and several other types of receivers. The theory behind the concept of the receiver involves a process of mixing. Two signals are multiplied together by with the use of radio-frequency mixers. With such a multiplication occurring with the signals, there is a direct signal delivered at the input and another produced at the output. The frequencies of the input and the output vary from each other, thereby leading new signals to be formed. Thus if f1 and f2 are two frequencies of the input signal, then the signals that are formed newly reflect frequencies of values (f1+f2) and (f1-f2) (The superhet or superheterodyne radio receiver). This can be explained by an example (The ...Show more
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Name of University College Program (Department) Course Code Super Heterodyne Receiver Semester and Year Name(s) of Author(s) Name of Instructor Abstract Super heterodyne receivers have in the recent years proved to be highly effective in overcoming several issues of the early signal frequencies and short wave amplifications and have proved to have essential applications in broadcasting media like the television and radio, as well as in security systems…
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