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Essay example - Super Heterodyne Receiver
Design & Technology
Pages 4 (1004 words)
Date Super Heterodyne Receiver Introduction Super heterodyne receiver is an important component in the fields of telecommunications, electronics and computer science. It is a radio receiver combining two radio-frequency signals by what is called heterodyne action so as to produce a signal above the limit of audible frequency (Tsui 63)…
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All modern television and radio receivers virtually use the principle of super heterodyne. The super heterodyne receiver reduces to the same intermediate frequency value. In order to accomplish this, it requires that the super heterodyne receiver be able to vary incessantly the frequency that is being mixed into the signal in order to keep the same difference (Jerry 1172). This paper will discuss Super Heterodyne Receiver and its various aspects. History The history of Super Heterodyne Receiver can be traced back to 1905 when Reginald Fessenden, a Canadian inventor, described proposed method to produce an audible signal from an Alexanderson transmitter. However, Edwin Armstrong, a United States Major, devised the principle of super heterodyne receiver in 1918 during the First World War in France. Armstrong invented this device as a way to overcome the deficiencies of early vacuum tube triodes that were being used as high-frequency amplifiers particularly in radio (Drentea 38). These amplifiers were used in equipment for radio direction finding and Armstrong realized that if these receivers could be operated at a much higher frequency, they would be better and more effective. At that time, however, there were no practical short wave amplifiers because of the existing limitations of triodes. ...
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