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A Mystery Signal Just Appeared on London Air Traffic Control

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WOW!! Now this is really weird

 

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As stated in the comments: That is NATS engineering running tests on the transmitter. Recording uses all the different nuances / tones of a human voice without it being intelligible. It is deliberately not understandable in any language to avoid it being confused as an ATC message

Cheers, Søren Dissing

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I recognized "RingwayManchester's" voice immediately. He frequently posts interesting and unusual radio related articles.

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