In article ,
Casper Milquetoast wrote:

wrote in message
roups.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?

"Lowfer" radio hobbyists

The US Lowfer band is 160-190 kHz. 47CFR15.217

Mark Zenier
Googleproofaddress(account:mzenier provider:eskimo domain:com)