CQD (transmitted in Morse code as ) is one of the first distress signals adopted for radio use. On 7 January 1904 the Marconi International Marine Communication Company issued "Circular 57", which specified that, for the company's installations, beginning 1 February 1904 "the call to be given by ships in distress or in any way requiring assistance shall be 'C Q D.
In the Vinony graph
Within Vinony's link graph, CQD is referenced by 61 other articles, and connects out to Massachusetts, radio and International Standard Book Number.
It sits within the topics Amateur radio history, Emergency communication and History of telecommunications.
Its subject is documented across 23 Wikipedia language editions.
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Encyclopedic overview
7 sectionsContents
- Background
- Replacement
- History of wireless distress rescues
- See also
- Footnotes
- References
- Bibliography
CQD (transmitted in Morse code as ) is one of the first distress signals adopted for radio use. On 7 January 1904 the Marconi International Marine Communication Company issued "Circular 57", which specified that, for the company's installations, beginning 1 February 1904 "the call to be given by ships in distress or in any way requiring assistance shall be 'C Q D.
==Background== Landline and submarine telegraphers' telegraphs had adopted the convention of using the station code "CQ" to all stations along a telegraph line. As the first wireless operators were taken from the already trained landline telegraphers, the current practices carried forward and CQ had then been adopted in maritime radiotelegraphy as a "general call" to any ship or land station.
Excerpted from Wikipedia’s “CQD” article, available under the CC BY-SA 4.0 licence.