dot-and-dash signals

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• dot-and-dash — I. | ̷ ̷ ̷ ̷| ̷ ̷ adjective or dot dash ˈ ̷ ̷| ̷ ̷ 1. : formed of or as if of alternating dots and dashes run a dot and dash line across the sheet 2. : consisting of or using an alphabet made up of dots and dashes as signals for communicating… …   Useful english dictionary

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• Coherer — Metal filings coherer The coherer was a primitive form of radio signal detector used in the first radio receivers during the wireless telegraphy era at the beginning of the twentieth century. Invented around 1890 by French scientist Édouard… …   Wikipedia

• ATSC tuner — Multiple MPEG programs are combined then sent to a transmitting antenna. In the US broadcast digital TV system, an ATSC receiver then decodes the TS and displays it on a TV. An ATSC (Advanced Television Systems Committee) tuner, often called an… …   Wikipedia

• omnigraph — ˈämnə̇ˌgraf, rȧf noun Etymology: omn + graph : a device for automatically producing dot and dash sounds of the telegraph code used in instructing radiotelegraph operators * * * /om ni graf , grahf /, n. a device for converting Morse Code signals …   Useful english dictionary

• Morse code — Chart of the Morse code letters and numerals Morse code is a method of transmitting textual information as a series of on off tones, lights, or clicks that can …   Wikipedia

• Battle of the Beams — The Battle of the Beams was a period in early World War II when bombers of the German Air Force ( Luftwaffe ) started using radio navigation for night bombing. British scientific intelligence at the Air Ministry fought back with a variety of… …   Wikipedia

• Radio navigation — or radionavigation is the application of radio frequencies to determining a position on the Earth. Like radiolocation, it is a type of radiodetermination.RDF / ADF / NDBThe first system of radio navigation was the Radio Direction Finder, or RDF.… …   Wikipedia

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• Digital — For other uses, see Digital (disambiguation). A digital system[1] is a data technology that uses discrete (discontinuous) values. By contrast, non digital (or analog) systems use a continuous range of values to represent information. Although… …   Wikipedia

• North American cable television frequencies — In North American cable TV networks, the radio frequencies used to carry signals to the customer are allocated to standardarized channel numbers listed in the CEA standard 542. Cable channel frequencies are generally different from off air… …   Wikipedia