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Ten-codes are abbreviated phrases used by public safety officials and CB radio enthusiasts to communicate quickly and clearly. Learn about the history, meaning and usage of ten-codes, such as 10-4 (understood), 10-33 (officer needs help) and 10-7 (out of service).
Learn about the 1982 sci-fi film directed by Steven Spielberg and starring Dee Wallace, Henry Thomas, Peter Coyote, Robert MacNaughton and Drew Barrymore. The film tells the story of a boy who befriends an alien left behind on Earth and helps it return home.
A walkie-talkie is a hand-held, portable, two-way radio transceiver that allows half-duplex communication. Learn about its development during World War II, its features and applications, and its classification as radio station / land mobile station.
Quindar tones were audio signals used to control remote transmitters during Apollo space missions. Learn how they worked, why they were needed, and what misconceptions they caused.
Donald Lewes Hings, CM MBE (November 6, 1907 – February 25, 2004) was a Canadian inventor, born in Leicester, England.In 1937 [1] he created a portable radio signaling system for his employer CM&S, which he called a "packset", but which later became known as the "Walkie-Talkie".
Learn the history and usage of the most widely used set of clear-code words for communicating the letters of the Roman alphabet, such as Alpha, Bravo, Charlie and Delta. The code words are also known as NATO spelling alphabet, ICAO phonetic alphabet and radiotelephony spelling alphabet.
SCR-536 was a hand-held radio transceiver used by the US Army Signal Corps in World War II. It was the first true hand-held unit to see widespread use and operated in AM voice mode between 3.5 and 6.0 MHz frequency range.
WSPR is a protocol and software for amateur radio operators to test propagation paths on the MF and HF bands. It uses frequency-shift keying, convolutional coding, and a central database called WSPRnet to exchange callsigns, locators, and power levels.