Observation 307780: Stars-AO (99974)

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This is exactly the issue, check also this post. Unfortunately rpi (if you use this) is not (cpu) strong enough to work with hackrf, not at least in a satisfying sample rate. This is why you get these Os, which means that gnuradio drops samples.
There are two alternatives, either you use another sdr, like rtl-sdr, or you use another more powerful pc platform.

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