Advanced Telecom System Theory
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Advanced Telecom System Theory Course
Introduction:
The aim of this course is to provide students with a comprehensive understanding of the fundamental concepts of telecommunications as applied in contemporary society. The course commences with an examination of modern telecommunications systems, encompassing topics such as the electromagnetic spectrum and the interrelationships of commonly utilized services.
It explores the necessity for modulation and delves into the basic principles of amplitude modulation (AM), frequency modulation (FM), and phase modulation (PM). Furthermore, the course covers essential principles related to radio communications, including transmitters, receivers, antennas, and propagation paths. Additionally, it addresses the fundamental principles of television, encompassing both video transmission and radio frequency (RF) aspects.
Course Objectives:
- The first objective is to give the student an overview of the field of telecommunications so that the inter-relationships, requirements and need for the detailed topics can be grasped more readily.
- The student will then study the detailed topics and will:
- Know the circuitry of tuned amplifiers and their impedance matching.
- Understand the principles of class C amplifiers and their applications as frequency multipliers.
- Learn the characteristics and circuitry of radio frequency oscillators.
- Understand the principles of amplitude, frequency, and phase modulation.
- Understand the principles of radio receivers.
- Understand the techniques used in digital communications.
Who Should Attend?
All telecommunications professionals.
Course Outlines:
Successful completion of the following units will enable the participants to:
Overview of Telecommunications
- The electromagnetic spectrum and the relationship of common services such as low-frequency navigation, AM Broadcast, short waves, television VHF and UHF, FM broadcast, mobile radio including a cellular telephone, VHF and UHF navigation, radar, microwave and satellite links.
- The eight subdivisions of the spectrum from VLF to EHF, the concepts of wavelength and frequency are included.
- The need for modulation, including the concept of modulation as one of frequency translation.
- The basic principles of the modulation process; the differences among AM, FM, and PM.
- The basic requirements of a radio transmitter: operating frequency, power output, bandwidth, choice of modulation, common practices.
- The basic requirements of a radio receiver: frequency selection and selectivity; sensitivity; a signal to noise ratio; bandwidth.
- The basic principles of electromagnetic wave propagation and the requirements of and for antennas. Basic antenna types: dipoles, monopoles, gain, or directive antennas.
Tuned Amplifiers
- definition
- types of tuned amplifiers
- single tuned
- double-tuned
- stagger tuned
- synchronously tuned
Class C Amplifiers
- Advantages of class C
- Conduction angle
- Biasing methods
- Frequency multiplication
Unit Outcomes Resources/Tests/Assignments
RF Oscillators
- build and experiment with other types of oscillators
- investigate the effects of temperature and stray
- concept of oscillation capacitance on the frequency
- tuned input tuned output oscillator
- compare the advantages/disadvantages of various
- Hartley, Colpitts, Pierce types types
- crystal-controlled oscillator
- build and experiment with a crystal-controlled oscillator.
Amplitude Modulation (AM)
- The basic concept of AM
- Modulator circuits
- Carrier and sidebands
- Distribution of power
- Percentage of modulation and efficiency
- The frequency spectrum of AM signal
- AM measurements
- Limitations of AM
- SSB
a) build an AM circuit
- see the envelope pattern of the AM signal for various types of waveforms as modulating voltages
- use an oscilloscope to measure the modulation percentage
- use a spectrum analyzer to study the relationship between the carrier and the sidebands for different modulating waveforms
- attempt reception of the so produced signal on an AM receiver
Frequency, Phase Modulation (FM, PM)
- build an FM circuit
- use a spectrum analyzer to study the spectral
- The basic concept of FM, PM relationship between the carrier and the sidebands for
- Modulator circuits FM waveforms
- Carrier and sidebands
- attempt reception of an FM signal on an FM
- Distribution of power receiver
- Percentage of modulation and efficiency
- The frequency spectrum of FM, PM signal
- FM, PM measurements
- Advantages of FM, PM
Basic Receivers
- learn what is expected of an ideal receiver
- appreciate and define the meaning of terms
- Performance: selectivity, sensitivity, noise sensitivity, selectivity, fidelity, and noise performance
- Tuned Radio Frequency TRF Rx
- build and operate a tuned radio frequency receiver
- Heterodyne Rx
- be familiar with detailed circuitry of a heterodyne
- Image frequencies receiver