II couple of years ago, I came across a mysterious electrical signal near 60 kHz, which was everywhere in the ground and in air.  I found it on the Cascade Crest Trail, in the Mojave desert and anyplace I turned my Fluke 199 B oscilloscope on, between Mexico and Canada. A German engineer had me persuaded  that the signal was a transmission artifact of my meter, which made sense until last month when I found it with a different meter.

There is nothing in this part of the EMF spectrum except the national clock which transmits at exactly 60 kHz. The signal is always stronger in the ground than the air, and logging the signal shows that its power jumps around and its frequency is fairly steady around 60 kHz but has numerous brief excursions to lower frequencies.

I've attached tracings of the signal in air and on the ground. The red tracing in the third panel is the peak to peak voltage,  and the fourth panel is the logged frequency.  On a spectrum analyzer it looks like a frequency hopping spread spectrum cell phone signal, but there are no cell phones operating at these frequencies.  If I were to guess, I think that it may be a secure communication system like GWEN.  

I'm posting it on my web site in hope that someone can figure it out. Thanks, 

Sam Milham

smilham@dc.rr.com. phone 360 866-0256 (after October 15, 760 775-5878)