University of California
Uc Berkeley: Radio Spectrum
From a course titled "Structure and Interpretation of Signals and Systems." A discussion of the entire radio spectrum, listing wavelength and frequency values for its various parts. The uses of each region of the radio spectrum is...
NASA
Nasa: The Inspire Project
An educational site devoted to the study of radio signals in our environment. The project seeks schools, classrooms, and individual students and teachers who are willing to participate in the collection and analysis of radio signal data....