October 8 2010 @ 05:30 utc 6.837 usb
http://www.mediafire.com/?bpzgkd0my3nll4n
me and Weak both heard this What is it ![Huh ???](https://www.hfunderground.com/board/Smileys/default/huh.gif)
Looks like sixteen different 'tones' or frequency 'slots' at any one time (in the recorded BW anyway) viewing an audio spectrogram that's updated in real-time as the audio is being played, and the tones slowly all 'drift' down (linearly seem to shift) in frequency (as Seamus observed using high-speed playback) ...
The fading may be due, at least in part, to fading/selective fading. The actual signal may be 16 tones.
I'd say propagation experiment, or a new analysis tool for evaluating a 'path' ... can't say that much data is being moved this way, but it is possible it's a comms taking place, although I have never seen a 'standard' that used drifting tones like these ...
Here's what Spectran shows:
![](http://oi56.tinypic.com/p885g.jpg)