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In engineering school, we learn to represent sinusoidal wave forms with vectors. But a paper textbook can't do justice to a time-varying vector. The java animations below add life to vectors and help the student visualize engineering fundamentals.
Java Animations
IQ Modulation
This program provides some insight into the workings of an I/Q (in-phase/quadrature) modulator by plotting vectors (phasors), waveforms, and symbols on the I/Q plane.
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Smith Chart
This program introduces the Smith Chart and demonstrates how it can be used to relate a transmission line reflection coefficient to the load impedance.
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Wave Propagation along a Transmission Line
This program illustrates the propagation of a signal along a transmission line.
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Single-Side-Band Demodulation
This simulation demonstrates the error in demodulating a single-sideband signal as a function of the relative amplitude of the reinserted carrier. The program compares the demodulated waveform to the modulating waveform and shows the difference.
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Amplitude Modulation
This simulation demonstrates the original amplitude modulation method used for transmitting audio signals over radio frequency waves. It is still used today in AM radio. This applet demonstrates the modulation process.
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Generating Waveforms with Vectors
Any waveform, from a pure sine wave to a complex cardiac waveform, can be created by adding a specific set of sine waves. This simulation shows what happens when you add in-phase harmonics to a sine wave. It also shows the equivalent rotating vectors, which, in the author's view, make the mathematical process easier to understand.
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Generating Pulses
This applet shows the huge number of harmonics of the pulse repetition frequency that are necessary to reproduce a low duty-cycle pulse train. Practically speaking, this shows that if you want to amplify a very low duty-cycle pulse train, you need an amplifier with large bandwidth. Notice that with a duty cycle of 10%, it takes more than ten harmonics to produce a good pulse. The more bandwidth the amplifier has, the more harmonics it can pass, and the faster the "rise time" of the pulse can be.
You may choose between two different views: a standard view displaying each of the component waveform and a composite three-dimensional view.
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3D View Generating Pulses
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Time Domain vs. Frequency Domain
The 3-d plot of frequency, amplitude and time shows the fundamental of a sine wave and up to 3 harmonics, as they are formed by rotating vectors. It's another way to view the construction of a complex waveform.
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Measurement Uncertainty
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Superheterodyne Spectrum Analyzer
This program illustrates the workings of a superheterodyne spectrum analyzer.
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AC Circuits
Computer Based Training
AM Fundamentals
AM Fundamentals is a Computer-Based Learning package which runs directly from the link below. Give your students a head start on learning about modulation index, sidebands, frequency and time domain, and all the underpinnings necessary for a good grounding in communications. Developed by Cal Poly. Repackaged for the WWW by ASK International. CAUTION: This file is 4.9 MB in size and could take several minutes, or even hours, if downloading over a slow network connection or a 28/56K modem.
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FM Fundamentals
FM Fundamentals are presented in seven interactive modules covering basic modulation concepts, narrowband frequency modulation, frequency modulation versus phase modulation, basic frequency modulation parameters, and demodulation techniques. Quick to load on your Windows PC. Developed by Cal Poly. Repackaged for the WWW by ASK International. CAUTION: This file is 5.7 MB in size and could take several minutes, or even hours, if downloading over a slow network connection or a 28/56K modem.
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Lightwave Fundamentals
With fiber-optic cable currently being added to our world at the rate of 100 kilometers per hour, it's important that students understand a little about the subject. This interactive tutor discusses the types of fibers, modes of transmission, light sources, and more. Developed by Cal Poly. Windows-based PC. CAUTION: This file is 4.3 MB in size and could take several minutes, or even hours, if downloading over a slow network connection or a 28/56K modem.
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ParBERT 81250 Tester Tutorial
The Agilent 81250 Guided Tour/Tutorial/Getting Started provides a comprehensive overview of the Agilent 81250 Parallel Bit Error Ratio Tester.
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Wireless (RF) Fundamentals
This interactive self-paced training program was designed to help you better understand our products for the wireless communications market.
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