What causes this "flutter" on FM signals?

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kkn50

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What causes this "flutter" on FM signals? I have heard it during tropo openings on FM Broadcast, VHF High Band. Heard this today on 30.300 mhz during an E skip opening. Here is a link to the audio file:

30.300 (OkieSam)

Thanks.
 
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zz0468

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What causes this "flutter" on FM signals? I have heard it during tropo openings on FM Broadcast, VHF High Band. Heard this today on 30.300 mhz during an E skip opening. Here is a link to the audio file:

30.300 (OkieSam)

Thanks.
Sounds like some sort of multipath where multiple reflecting points are moving in relationship to each other. I've heard similar fading on paths known to have an airplane bounce component.
 
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