cqd wikipedia - EAS
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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,
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See moreLand telegraphs had adopted the convention of using "CQ" ("sécu", from the French word sécurité) to identify alert, or precautionary messages of interest to all stations along a telegraph line. CQ had then been adopted in
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See moreFrom 1899 to 1908, nine documented rescues were made by the use of wireless. The earliest of these was a distress call from the East Goodwin
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See moreAt the first 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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See more• 500 kHz (Morse distress frequency)
• 2182 kHz (voice distress frequency)
• Global Maritime Distress and Safety System...
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