[Lowfer] Unknown signal

[Garry Hess]

If anyone tunes below the lowfer spectrum, perhaps you can help identify 
the FSK-like signal I've been seeing recently at 26.0 kHz. It looks just 
like NAA et al and is fairly strong in the morning hours. I know WWVL 
used to transmit FSK on that frequency, but it shifted between there and 
20 kHz and has been off for many years. 
http://www.vlf.it/trond2/25-30khz.html lists nothing right on 26.0 kHz, 
new or old, nor does http://www.classaxe.com/dx/ndb/rww/ show any spots.

Thanks for the help,

Garry, K3SIW, EN52ta, Elgin, IL