From "Lowfer SIW QRV" on September 9, 2016: To decode WSPR-15 use the wspr-x software available for download at http://physics.princeton.edu/pulsar/k1jt/wspr.html. The monitored frequency range is audio tones between 1600 and 1625 Hz, so tune your radio to say 183575 Hz, USB so the signal appears at 1610 Hz. 73, Garry, K3SIW, EN52ta, Elgin, IL