We've sent a verification link by email
Didn't receive the email? Check your Spam folder, it may have been caught by a filter. If you still don't see it, you can resend the verification email.
Whilst I was playing around with the Twente University online radio receiver, this weird 'melody' came up on the airwaves. It consists of sine tones and I have no idea of what it is.
A possible thing it could be is an interval signal of a 'numbers station' played in between the readings of all those phonetic alphabet and number sequences. Recorded direct from the website.
(interesting spectrogram)
Type
Wave (.wav)
Duration
0:21.576
File size
300.0 KB
Sample rate
7119.0 Hz
Bit depth
16 bit
Channels
Mono
5 years, 3 months ago
That is a shortwave digital mode called JT65.
7 years, 3 months ago
Very creepy! Thanks!