A CDE Definition
The transmission of electromagnetic energy. See radio.
(1) The transmission of wireless signals (electromagnetic waves) over the air or through a hollow tube called a "waveguide." Although "radio" is often thought of as only AM and FM or sometimes two-way radio, all transmission systems that propagate signals through the air are some form of "radio," including TV, satellite, portable phones, cellphones and wireless LANs. See spectrum.
(2) An electronic circuit that transmits and receives wireless signals (electromagnetic waves). The phrase "the device has four radios" means the unit has some combination of receivers and transceivers, which may reside on one or more chips. See transceiver.
A Four-Radio Chip From TI
(3) A device that receives wireless audio signals (electromagnetic waves) such as an AM/FM radio or satellite radio. See Vintage Radio Museum.
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