Title of Lesson: Amplitude and Frequency Modulation
Date: 6-2-2008 Timeframe of Lesson: 15 minutes
Author(s): Gary Herlache
School District: FVTC
Campus: Appleton
Subject Area(s): Electronics
Grade Level(s)/Course: 13

State Standards
http://www.dpi.state.wi.us/dpi/standards/
Production of Quality Work
Acquiring and using information
Subject Specific:

Identifying / comparing AM (Amplitude Modulation) and FM (Frequency Modulation)





Technology Specific: [[http://dpi.wi.gov/imt/itlstfst.html%3C/span%3E%3C/span%3E%3Cspan|http://dpi.wi.gov/imt/itlstfst.html<span]] style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 'Times New Roman','serif'; mso-bidi-font-size: 11.0pt">
Or the info.pdf file in the Lesson Folder.
Locate and access information sources




Stated Objective(s)



In this lesson the student will be able to view the AM and FM outputs simultaneously and visually are able to see the difference between the two types of modulation schemes using a common input signal. This will allow students to gain a basic understanding of the two.


Procedures for Lesson



Step 1. The student will need to open the Power Point slide provided on a common school drive and start the application. Once open the application will show the two outputs in sync with a common input signal “Information/Modulating Signal”. The students are to view the difference in outputs and relate the two outputs to the input signal level changes.

Step 2. The students are to click the solid gray button on the upper right corner of the screen to activate the input control signal level. Once the button is clicked a gray triangular pointer will appear under the gray button. The student is to then click on the pointer and drag the input control up simulating a higher level input or down to simulate a lower lever input signal. The student is to drag the input control through the full range of input signal level possibilities and visually observe the corresponding changes in AM and FM output waveforms. De-activate the input level control by clicking on the gray button.

Step 3. To reinforce the difference in modulation schemes the student will:
v First need to disable the FM waveform by clicking on the red “FM” button leaving the AM waveform only running. The students are to click the solid gray button on the upper right corner of the screen to activate the input control signal level. Once the button is clicked a gray triangular pointer will appear under the button. The student is to then click on the pointer and drag the input control up simulating a higher level input or down to simulate a lower lever input signal. Observe the changes in the modulated output waveform.

v Second, disable the AM waveform and enable the FM by first clicking the blue “AM” button and then clicking the red “FM”. Next the students are to click the solid gray button on the upper right corner of the screen to activate the input control signal level. Once the button is clicked a gray triangular pointer will appear under the button. The student is to then click on the pointer and drag the input control up simulating a higher level input or down to simulate a lower lever input signal. Observe the changes in the modulated output waveform.







Assessment or Evaluation




In class have the student explain in their own words how the two modulation schemes differ from one another. Use as a test question at the end of the section.




Enrichment


By providing an interactive animated graphical representation of the two modulation schemes the student will gain faster comprehension of how these schemes initially work and how they differ from one another.
Materials



Technology Resources: URLs, Software, # of Computers, Printers, etc…
Access to the school network via computer, access to the common G drive, Apps folder, Digital Comm Ind. Networking folder, sub folder labeled: Modulation and Demodulation, file:Wireless communicationsSlide11.ppt” and Power Point software

Other Resources: Book Titles, Art Supplies, Manipulatives, etc….