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A receiver has the functions of selecting the desired signal from all the other available signals, amplifying and demodulating it, and displaying it in the desired manner. in the Amplitude Modulation (AM) receiver, the incoming signal voltage is combined with a signal generated in the receiver to produce a lower fixed frequency. The signal at this intermediate frequency contains the same modulation as the carrier, and it is now amplified and detected to reproduce the original information.
A constant frequency difference is maintained between the local oscillator and the Radio Frequency (RF) circuits, normally through capacitance tuning, in which all the capacitors are ganged together and operated in unison by one control knob. The IF (Intermediate Frequency) amplifier generally uses two or more transformers, each consisiting of a pair of mutually coupled tuned circuits.
It provides most of the gain and therefore sensitivity and bandwidth requirements of the receiver. The selectivity and sensitivity of the superhet are usually fairly uniform throughout its tuning range and not subject to the variations that affect the TRF receiver.
The IF signal output is an amplified composite of the modulated RF from the transmitter in combination with RF from the local oscillator. Neither of these signals is useable without further processing. The next process is in the detector stage, which eliminates one of the sidebands still presents and separates the RF from the audio components of other sideband. The RF is filtered to ground, and audio is supplied or fed to the audio stages for amplification and then to the speakers, etc.
Because of its narrow bandwidth, the IF amplifier rejects all other frequencies but 455 KHz. This rejection process is the key to the superheterodyne's exceptional performance, which is why it is widely accepted. The process of tuning the local oscillator to a predetermined frequency for each station throughout the AM band is known as tracking and will be discussed later.
This project will cover AM receivers in general, showing why their format has been to a certain extent standardized. Each block of the receiver will be discussed in detail, as will its functions and design limitations.
Design and Construction of Amplitude Modulation Receiver
1.1 Introduction
… As a prelude to other parts of this study, this chapter will discuss the background upon which this study was initiated, the statement of problems that led to this study, the Aim and Objectives of the study. Others are Significance of the study, Scope of work, Research hypothesis and questions, Limitation of the study and Definition of technical terms.…
Defense Procedure for Electrical / Electronics Engineering (EE) Researchers
In preparation for defending a project or seminar on Design and Construction of Amplitude Modulation Receiver, it is imperative that as a nursing student, you demonstrate comprehensive knowledge of your research. The defense process is structured to include presenting your work, answering questions, and illustrating its pertinence. Initially, provide a succinct yet thorough introduction to your research topic, emphasizing its importance and the objectives, ensuring that both the audience and the External Examiner can understand the scope of your study.
Prior to your defense, be thoroughly acquainted with your research abstract and the critical elements of Chapter One, including motivation for embarking on this research, problem statement, objectives, and significance. In Chapter Two, be ready to cite at least two references from the literature review. For Chapter Three, you should be equipped to discuss the methodologies, tools, and techniques utilized. In Chapter Four, defend your research by justifying the findings and linking them to your research objectives.
Conclude your defense by succinctly summarizing the study and offering insightful, evidence-based recommendations. A professional dress code, such as wearing a suit and tie, is vital to create a favorable impression and elevate your presentation.
During the question and answer segment, the External Examiner may pose questions pertaining to your research. If confronted with a challenging or irrelevant question, respond diplomatically with, “Sorry, Sir/Madam, the question asked is beyond the scope of my study.” Whenever possible, direct your answers back to your research findings to reinforce your expertise.
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