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Why RF frequency uses 433 MHz?

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Answered 2011-01-20 15:51:03

433MHz (433.92MHz in fact) is the most used frequency on earth. It's a free use unprotected Short Range Devices frequency used by a lot of devices.

To name a few, car keys, door openers, external wireless thermometers

and pressure sensing devices, radio ham TV,... and

wireless alarm systems.

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