What part of the radio frequency spectrum do GPS satellites use to beam their navigation signals down to Earth?
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GPS signals are transmitted in the microwave range, specifically on frequencies known as the L-band. Microwaves are perfect for this job because they can easily penetrate clouds, rain, and plastic casings, though they struggle with dense foliage and concrete walls. Shortwave frequencies are used for long-distance international radio broadcasts instead.
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Source: Wikipedia (CC BY-SA)
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