Introduction to Radio Technology
- Frequently Asked Questions About Two-way Radio and Cellular [HR Online]
- "Red and Green" Electricity, by William J. Beaty
- BBC Education: The BBC Morse Code Engine- requires Java-capable browser, converts typed text to Morse code
- BBC Education: Electricity - Making Connections
- BBC Education: Sending Messages (Click the "Reveal" button at the end of each page to continue with the lesson).
- The How Stuff Works web site (EXCELLENT) - includes explanations of the radio spectrum, how cellular phones, GPS work, etc.
- Novice/Technician License Practice Exams
Technical Topics in Radio Technology
- Repeater Builders Technical Information page - Kevin Custer W3KKC's excellent resource for technical information on constructing Amateur Repeater Systems.
Ionosphere and Space-related Radio Science
- What Is the Ionosphere?
- What Is A Solar Flare?
- A Beginner's Guide to the Earth's Magnetosphere (Grade 8 or higher)
- IPS Radio & Space Services(Australia) provides a wide variety of educational material about the sun, solar activity, sunspots, the ionosphere, the Earth's magnetic field, HF radio communications and a variety of other fascinating topics. Highly recommended.
- Alaskan Space Science - All About the "Northern Lights" (excellent)
- How An Auroral Radar Works
From the University of Alaska's Poker Flat Research Station - a "Shockwave" animated tutorial on how radar and the Auroral Radar system works.
Radio Safety Issues
- Comparison of Electro-Magnetic Field Strengths From Various Types of Transmitters
- ELF Field Strengths
Note that this chart does not take into account that some of these radio frequency sources operate only intermittently, not continuously.