Super Heterodyne Receiver Assignment Example | Topics and Well Written Essays - 2500 words

Super Heterodyne Receiver - Assignment Example 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 intell igence 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 othe r, 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

Ethics Research Paper Example | Topics and Well Written Essays - 1000 words - 2

Ethics - Research Paper Example Employees mostly follow the actions of the leaders such that if an employee knows that a leader is dishonest in business dealings, there is the likelihood that he or she will conduct business ignoring the laid down rules and procedures. Ethical climate can best be defined as part of an organisations culture. Organisation is like a tribe where the members have their own way of communicating, beliefs and assumptions as well as power structure. The elements combine to form an organisation’s culture. Different organisations are faced with are faced with different sets of ethical challenges and there is established moral values and norms which serve as guidelines for establishing ethical standards. Ethical climate as such determines what members of an organisation see as right or wrong shaping their ethical decision making and behaviour. Ethical climate is of paramount importance since it boosts the morale of employees, enriches organisational commitment and fosters an involved workforce and improves employee retention (Gilliland, 2007). Biases that affect moral decision making are antisocial actions that harm others in the organisation and by extension affect the productivity of business in such an organisation. Such biases include discrimination due to gender, age, disability, level of education or job definition in the work place. Such ill treatment is guided by existing stereo types and prejudice. These stereotypes for example are the notion that old people cannot learn new skills or the belief that some races are lazy such as the Hispanic. Discrimination in the work place is generally expressed subtly through behaviours such as disregarding the achievements of people due to the colour of their skin, women, and low class status. Hiring and promotion is also done on the same basis such that some organisations will promote men despite having lesser qualifications and experience than the women (Giacalone, 2003). Nepotism is another form of bias that can affect