[600MRG] Unidentified signal

[Eric NO3M]

Anyone else see a strange signal centered in the WSPR window (approx 
475.695)?  It looks like three WSPR signals right next to each other for 
about 2 minutes, then silence, then looks like a single WSPR signal for 
almost 4 minutes, silence again, then back to three. Seems most 
noticeable southwest from here.

Waterfall screenshot: http://no3m.net/uploads/images/wspr-waterfall.png

73 Eric NO3M / WG2XJM