Signal that is moving down

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Signal that is moving down
Frequencies "MHz-700MHz" is not declared as a valid unit of measurement for this property.
Frequency Range 0 Hz - 0 Hz
Location The Netherlands
Short Description Weird signal that moves slower the lower it gets down the band. If the mode is set to NFM, WFM, AM and probaly some more it doesn't give any sound. However in CW and RAW it sounds like a high pitched noise.
I/Q Raw Recording
Audio Sample

Possibly a normal signal with a doppler shift?