Sinusoidal frequency drifts on 40m

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Sun, 2010/11/21 - 02:22
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AE3JM
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Joined: 2010/10/25 - 00:30
Sinusoidal frequency drifts on 40m
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Image icon WSPR screen shot.JPG96 KB

Does anyone know what the sinusoidal frequency drifts shown in the attached screen shot might be?

The time shown is 1:46 to 2:16 UTC 11/21/10 on 40m.

Tnx,

Jason AE3JM

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