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We generally think of radio waves (radio electromagnetic radiation) as those frequencies of electromagnetic (EM) radiation that fall within a band of frequencies below those of light. These include microwave bands, on which satellites communicate and cell phone operate, as well as the familiar microwave oven. Radar also operates in this band. Below that we find television signals, as well as some two-way radio signals. Other forms of communications radio signals (like amateur or "ham" radio) as well as broadcast radio operate below the television bands.

By considering the types of equipment mentioned above, it is possible to make a list of some sources of radio electromagnetic radiation.

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