How the Radio Spectrum Works | HowStuffWorks
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Long range radio transmission is possible when the radio waves are reflected from the ionosphere. For this to happen, the frequency of the radio waves must be in the range
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Nats S04-14: The Electromagnetic Spectrum
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What are radio waves? | NASA
Radio Waves - an oscillation transferring energy or information
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What is Radio Spectrum? | US Department of Transportation
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More about radio waves and electromagnetic radiation
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The EM spectrum
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Radio wave | Examples, Uses, Facts, & Range | Britannica
Radio Frequency Bands | TeraSense
Electromagnetic spectrum - Wikipedia
What are radio waves? | NASA
The electromagnetic spectrum
What is the bandwidth of radio waves? - Quora
High frequency - Wikipedia
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EMF-Portal | Electromagnetic spectrum
