Swings in received frquency

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G3XDH
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Joined: 2010/12/16 - 12:12
Swings in received frquency
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I have noticed swings in the received frequency in the waterfall ..

see attached screenshot .. and have wondered if if is my kit which is changing or whether the signal is distorted elsewhere .. all WSPR traces show the same change pointing to it being my kit but there is a faint trace of other continuous signals which don't seem to be affected ..

I would be interested to understand what causes these disortions .. only about 25Hz