wrote in message
oups.com...
www.lazygranch.com/sound/shortwave/136khz.wav
Recorded in the SF bay area. I got the demo of skysweeper to decode it
as FSK, though not terribly interesting data.

Any idea of the source of this signal?


Interesting. Narrow shift (50 Hz?).
50 Baud. Minimum shift keying apparently.
Similar to DGPS but different.

I can receive it in San Diego but it is
pretty weak.

This fellow has an experimental license:
http://www.arrl.org/news/stories/2003/08/07/2/?nc=1
But he is sending CW, not FSK.

(US hams don't have an allocation the
http://www.eham.net/articles/6372?eh...2e34c1bc3ec1a3 )

--
rb