Radio is the transmission of information and reception of information, using electromagnetic waves. Some devices used for radio communications are also known simply as a "radio."

The term radio is also sometimes used in referenced to more advanced communications technologies, the word having become synonymous with near instantaneous audio communications. (TOS comic: "Captain's Pleasure")

In an altered 1944, Hoshi Sato played a recording of a radio address by Winston Churchill to Great Britain and the rest of Europe. (ENT episode: "Storm Front")

In July 1947, Roswell, New Mexico was abuzz with overlapping radio transmissions due to the atomic bomb testing by the United States Army Air Corps. (DS9 episode: "Little Green Men")

When the timeship Aeon arrived on Earth in 1967, its crash interfered with ham radio operator Henry Starling's signal. (VOY episode: "Future's End")

The Cape Canaveral radio activity of 1968 was instrumental in the success of Kirk and crew's obtaining sensitive data on this time period for 23rd century historians. (TOS episode: "Assignment: Earth")

The Enterprise accidentally hailed the U.S.A.F., in 1969, believing it to be Federation Starfleet. Transcripts of this communique'-not destroyed-was later decoded and became the reference Star Fleet Technical Manual. (TOS episode: "Tomorrow is Yesterday")

Radiation and scattered radio reception of 1986 San Francisco Bay made Chekov unable for beam up by transporter-albeit a cloaked, underpowered Bird of Prey, locking on to his communicator. (TOS movie: Star Trek IV: The Voyage Home)

The radio bursts from the ill-fated SS Columbia distress call, diverted USS Enterprise to the Talos star group, in 2254. These radio beams, in reality, were fabricated by the combined, telepathic strength of the Talosians. (TOS episode: "The Cage")

In 2267, the USS Enterprise received a radio distress signal from the third planet of the Beta Mariotia system. (TOS comic: "No Compromise Part One")

In 2268, Spock hailed the USS Enterprise from a radio station on Sigma Iotia II. Uhura was able to reply to the unusual frequency, as both the science officer and Doctor McCoy had their communicators confiscated. (TOS episode: "A Piece of the Action")

Again, in 2268, Isak mistakenly thinks Kirk and Spock attempt to build one, while imprisoned on Ekos. The three manage to escape, using rubindium transponders with the lights in their cell. The orbital, missile attack on Zeon (planet) was also to be orchestrated by radio command. (TOS episode: "Patterns of Force")

V'Ger attempted to contact its Creator on Earth by using the old-style, binary carrier wave, called radio. (TOS movie: Star Trek: The Motion Picture)

Following the malfunction of Ganitriul, the artificial intelligence which controlled much of planet Eerlik, the Eerlikka were able to use old-fashioned, two-way radios for communication. (SCE eBook: Fatal Error)

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