AussieDrifter wrote:

Michael,

No worries heres an MP3: http://www.mediafire.com/?5dcdndzhh1t


snip

Thanks. I've posted the file on my site to permit downloading and
saving without needing a ripper:

http://www.cybertheque.org/ham/audio/oznoise.mp3

I presume that only the approx. 10 Hz pulses constitute the signal
under discussion and that all other sounds are QRM.

Has anyone heard HAARP or other atmospheric research RF emissions
for comparison? The P.R.R. of this signal suggests to me some sort
of power transmission (RF pumping of the ionosphere?) or industrial
process rather than conveying intelligence. Or could it be pulse
doppler? Wouldn't O.T.H. radar be using a chirp and a much lower
P.R.R.?

Regards,

Michael