[Lowfer] Unidentified FSK on 135.2 and 136.3 kHz

[Garry]

Last night while monitoring wspr signals on 136 kHz noticed not one but 
two relatively wideband signals. The look like what's seen at VLF and 
weren't so strong as to bother wspr decoding. I've seen both in the past 
but have to label them as unknowns because I have no idea what they are. 
Perhaps animal RFID like discussed at 
https://en.wikipedia.org/wiki/ISO_11784_%26_11785.

73, Garry, K3SIW, EN52ta, Elgin, IL