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Tag Archives: Maritime distress signals

The VHF Radio Distress Call

VHF Radio Distress Call: British Post Office engineers inspect Guglielmo Marconi’s  wireless telegraphy (radio) equipment, during a demonstration on Flat Holm Island, 13 May 1897. This was the world’s first demonstration of the transmission of radio signals over open sea, between Lavernock Point and Flat Holm Island, a distance of three miles.

Radio or ‘wireless’ was first used aboard ships early in the 20th century. The wireless signal itself was just the carrier for telegraph and telephone messages through the ether. Telegraphy was sent via Morse code and telephony was done by …

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