Aircraft Wingtip Vortices
30. 02 Oct 2012 1338 UTC - Spectran analysis of the final 80 seconds of a 2 meter WSPR signal showing the discrete tones. This signal did not decode due to the 25 Hz negative frequency drift over the period. Moving symmetric side images 35 dB down from main signal are observed. The corresponding WSPR waterfall segment is on the right.