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A microwave radio system is any system of radio transmitters and receivers that

operate at frequencies above 3 GHz (3 billion waves per second).

At those frequencies, it's possible to fabricate antennas that focus the power of the

transmitter in a very narrow beam. So these frequencies aren't generally used for

'broadcast' over a wide area. They're almost always used to communicate between

two single points. A dense stream of information can be carried many miles on a

microwave radio signal of only a few watts. (Compare with 1,500 watts or more

used to warm leftover meatloaf in the microwave oven.)

Satellite TV signals going to small home 'dishes' are in the microwave spectrum.

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