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bn:00458578n
Noun Concept
Categories: Emergency communication, History of radio, Morse code, Maritime communication
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
Definitions
Relations
Sources
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
IS A
frequency
Wikipedia
EN
500 kHz
Wikidata
EN
500 kHz
Wikipedia Redirections
EN
500 kc, 500 KHz, 500kHz, 600 meter band, 600 meters, 600m band, Auto alarm

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