What does CQD mean in Unclassified?

This page is about the meanings of the acronym/abbreviation/shorthand CQD in the Miscellaneous field in general and in the Unclassified terminology in particular.

Colloidal Quantum Dot

Miscellaneous » Unclassified

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Definition

What does CQD mean?

CQD
CQD, transmitted in Morse code as – · – · – – · – – · · is one of the first distress signals adopted for radio use. It was announced on 7 January 1904, by "Circular 57" of the Marconi International Marine Communication Company, and became effective, beginning 1 February 1904 for Marconi installations. Land telegraphs had traditionally used "CQ" to identify alert or precautionary messages of interest to all stations along a telegraph line, and CQ had also been adopted as a "general call" for maritime radio use. However, in landline usage there was no general emergency signal, so the Marconi company added a "D" to CQ in order to create its distress call. Thus, "CQD" is understood by wireless operators to mean, "All stations: distress." Contrary to popular belief, CQD does not stand for "Come Quick, Danger", "Come Quickly: Distress", or "Come Quick—Drowning!"; these are backronyms. Although used worldwide by Marconi operators, CQD was never adopted as an international standard since it could be mistaken for a general call "CQ" if the reception was poor. At the second International Radiotelegraphic Convention, held in Berlin in 1906, Germany's Notzeichen distress signal of three-dots/three-dashes/three-dots was adopted as the international Morse code distress signal.

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"CQD." Abbreviations.com. STANDS4 LLC, 2020. Web. 11 Jul 2020. <https://www.abbreviations.com/term/1527222>.

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