bn:00458578n
Noun Concept
Categories: Maritime communication, Emergency communication, Morse code, History of radio
EN
500 kHz  500 kc  500kHz  600 meter band  600 meters
EN
From early in the 20th century, the radio frequency of 500 kilohertz was an international calling and distress frequency for Morse code maritime communication. Wikipedia
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EN
From early in the 20th century, the radio frequency of 500 kilohertz was an international calling and distress frequency for Morse code maritime communication. Wikipedia
A radio frequency Wikipedia Disambiguation
Wikipedia
EN
Wikidata
EN