How can I decode large drifts (heard on 6M)

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g4bbh
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Joined: 2009/11/20 - 13:53
How can I decode large drifts (heard on 6M)

I have been receiving a signal on 6M which WSPR was unable to decode. The drift shows on WSPR display as some 25Hz to 30Hz during the 2 minute transmision and seems to be correctly timed. As this is the strongest signal I have received today I am intersted to see what it is.
Any suggestion on how I can decode this (I have kept the files).
Dick G4BBH