Left: WSPR "horizontel waterfall" display of a 50 MHz WSPR signal
from N7GLS, 13 miles away on the other side of the Portland West Hills.
The extra lines are believed to be reflections from passing aircraft.
Oz one ONE MILLIWATT
More WSPR images
Slide Show on WSPR and JT65 for the May OTVARC Meeting (Powerpoint Translation)
Linux source for WSPR (works with Fedora 17)