radio

1. 자료: Computer Desktop Encyclopedia: radio (http://www.answers.com/radio)

(1) A transmit/receive device; a transceiver. The term may refer to the entire unit or only to the circuits that do the actual transmitting and receiving. The phrase "the device has two radios" means the unit has two transmitters or two transceivers.

(2) The transmission of electromagnetic radiation (energy) through the air or through a hollow tube called a "waveguide." Although radio is often thought of as only AM and FM radio or sometimes two-way radio, all transmission systems that propagate signals over the airwaves are called "radio," including TV, satellite, portable phones, cellphones and wireless LANs. Seespectrum.

Electromagnetic Spectrum

The radio portion of the entire spectrum of radiation is from 3 kHz to 300 GHz. This huge band of frequencies has been defined by the FCC in the U.S. and governmental bodies in other countries.

2. 자료: Am Heritage (http://www.answers.com/radio)

1. The wireless transmission through space of electromagnetic waves in the approximate frequency range from 10 kilohertz to 300,000 megahertz.

2. Communication of audible signals encoded in electromagnetic waves.

3. Transmission of programs for the public by radio broadcast.

4(a). An apparatus used to transmit radio signals; a transmitter.

4(b). An apparatus used to receive radio signals; a receiver.

4(c). A complex of equipment capable of transmitting and receiving radio signals.

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