ELT 205 - Communication Systems
An introduction to radio communication theory. Topics include oscillation, tuned and rf amplifiers, transmission line effects, matching techniques using the Smith chart, spectral analysis using the Fourier series, AM/FM/SSB transmitter and receiver designs, video and stereo designs, and data communication. In the laboratory, students build and test communication circuits using an assortment of popular devices and test equipment used in this field. The computer (Multisym) is used to emulate, analyze, and collect data for communication circuits and systems. Spring semester only. Three class hours, five laboratory hours.
Prerequisite: ELT 201 with a grade of C- or better, or permission of department chairperson. NOTE: In addition to prerequisite, ELT 202 is recommended.
Course Learning Outcomes
1. Use the Fourier series to describe the frequency components of signals found in rf communication circuits. The student can give examples of internal and external noise in a communication system and can calculate whether a certain noise level is detrimental to a given communication link.
2. Draw and use labeled block diagrams to describe how an assortment of rf transmitters and receivers operate. This includes verbalizing the function of amplifers, modulators, filters, detectors and a discussion of the superheterodyne signal process.
3. Describe the process of rf signal reflection and matching of transmission lines. The student can calculate signal loss, standing wave ratio and reflection coefficient for un-matched transmission lines. This includes the proper use of the Smith chart in evaluating performance. The student can identify and compare a variety of specific coaxial and open wire cable designs.
4. Compare AM, FM, SSB, and digital modulation schemes and describe how these particular modulator and detector circuit designs work. The student can use a phase-locked loop to perform FM detection and frequency synthesis.
5. Effectively use digital phosphur oscilloscopes, sweep frequency generators, and spectrum analyzers to accurately measure signals within communication circuits and systems.
6. Build, test, and troubleshoot a wide assortment of communication circuits such as amplifiers, modulators, filters, detectors, superheterodyne receivers, and simulated transmission lines.
7. Design and implement rf/audio oscillators and matching networks when provided with access to design equations.
Course Offered Spring only