For about a week or so now, I've been paying attention to a shortwave station based on 14077.23 kHz.
The station periodically broadcasts random-sounding 'melodies' made from sinewave tones (similar to 'creepy melody.wav').
It might be a numbers station with completely encrypted content, so I've got no idea what it is, but it is probably a numbers station of some description. Just without the readings of the phonetic alphabet or number sequences.
Try the frequency on Twente University's online radio receiver (I recorded this from there):
http://websdr.ewi.utwente.nl:8901/
Until then, stay happy, and try working out what on earth this is!
kwahmah_02
P.S: Here are all the times in this recording the melodies play! It seems to start on the '45s each time.
0:00
0:46
1:45
2:45
3:45
4:44
5:45
6:44
7:46
8:45
9:46
Type
Wave (.wav)
Duration
10:36.331
File size
8.6 MB
Sample rate
7119.0 Hz
Bit depth
16 bit
Channels
Mono
Comments
8 years, 2 months ago
I was going to comment but I couldn't explain it better.
8 years, 11 months ago
That's Amateur radio stations communicating with the JT65 digital mode. It's specially designed for low data speeds and signal strengths and uses a synchronized transmitting time frame of 1 minute (from which 46.8 seconds are used for real transmission, the rest of the minute is for setting up your next transmission). I've been using this mode quite a lot as it allows you to reach stations over large distances with only a few watts of transmitter power.
