5 ms·

Any speculation that it's as mundane as a test tone for a specific radio device? Is your radio working, is it calibrated properly...

• Luc 9y ago
  No, not really.
  • deleted 9y ago
    [deleted]
• bamboozled 9y ago
  If you read the article it kind of gives it's most probably reason for it's existence away.
• deleted 9y ago
  [deleted]
• westbywest 9y ago
  As mentioned in the below comment, the author buried the probable lede: most of the time transmission is a placeholder to discourage others from using the band. During exceptional circumstances (as defined by the station's operator), it will transmit coded messages to global/regional operatives. E.g., to coordinate espionage when conventional communications are offline.
  • jpalomaki 9y ago
    That constant sound is also useful for the spies. Without that it would be hard to know you have tuned on the right frequency (I'd assume they would use some pretty simple and low tech radios).
    • wbl 9y ago
      They would use commercially avaliable radios in the place they live to deter suspicion.