Communication Systems and Technology

Information Representations

• An excellent series of interactive tutorials available at Agilent's Teacher Tools site

See the following, particularly relevant interactive (Java) applets:

Interactive Amplitude Modulation (AM) Model
Interactive Frequency Modulation (FM) Model
Generating Waveforms with Vectors
Generating Pulses
Time Domain vs. Frequency Domain
Measurement Uncertainty
Single-Side-Band Demodulation
Superheterodyne Spectrum Analyzer
Wave Propagation along a Transmission Line
Smith Chart
IQ Modulation

• Fourier Synthesis: An interactive applet (Java) for studying Fourier analysis developed by Thomas Huber of the Physics Department of Gustavus Adolphus College.

Physics of Communication Technology

• Physics 2000: A wonderful set of quite insightful applet modules created and maintained by the Physics Department of the University of Colorado at Boulder.  These Java-enhanced sites explore many important topics in modern physics in a quite accessible way.

See the following, particularly relevant interactive applets:

Electromagnetic Waves
Catch the Wave
Stadium Waves
Charges and Fields
The Electric Force
Electric Force Fields
Wiggling Charges and Electromagnetic Waves
Speed of Light

 
• UCD ElectroCard - An Exploratorium for Electromagnetism:  Another wonderful set of applet modules created and maintained, in this case, by the Physics Department at the University of Califoria at Davis.

See the following, particularly relevant interactive applets:

Radiation - Overview
Radiation - Oscillating Charge
Radiation - Retarded Time
Radiation - Dipole Radiation
 
 
• Exploring Electric Fields: An excellent applet (Java) for the visualization of the electric fields  from the Université Laval, Québec.

 
• Electrical Charges in Java: A more elaborate applet  (Java) for the visualization of the electric fields of randomly distributed charges developed by by Sebastián Rodríguez at the Universidad de Chile.

 
• From the Physics Department at Georgia Tech: Physics Applets
 
See the following, particularly relevant interactive applets:
 
Propagation of Electromagnetic Waves
Fourier Synthesis
 
• The Virtual Lab for Engineering Electromagnetics: a more advanced, but still accessible set of applets by Professor Jen-Shiun Chen at Southern Illinois University at Edwardsville.

 
See the following, particularly relevant interactive applets:
 
Wave Propagation in a Lossy Medium
Fading Effect
Time Domain Pulse Propagation
• At a more advanced level see

 
Computer Aided Electromagnetics in the Classroom from the Group at RIT.

VRML Gallery of Electromagnetism by Rob Salgado of Syracuse University.

Teaching Electromagnetism Using Advanced Technologies by John W. Belcher of MIT.
 

• The Addison Wesley collection of electromagnetism (Java) applets - Unit V: Simulations

Simple Calculators

• Frequency and Wavelength: A calculator that converts frequency and wavelength.

 
• Spectrum Tuner Applet: a quickly calculates wavelength, frequency, and energy associated with a given point on a graphical electromagnetic spectrum by Guy McArthur at the University of Arizona.