Regarding Observation 3817587 …
The audio recording seems to translate to OM9GRB “Hello Earth” message, translated independently by multiple people of our team and friends in apps or manually. Thank you for the observation.
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Here is another one:
https://network.satnogs.org/observations/3817594/
The data in ascii, not hex, shows:
OM9GRB = COMd = Hello, Earth! =
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Yes, we noticed this one too. However, the satellite woke up around 11:00-UTC this was a misunderstanding and automatic reaction by satnogs 
but at least we know how the real data will be displayed.
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@marcelfr congratulations on your successful deployment. So the signal in https://network.satnogs.org/observations/3817594/ is a terrestrial signal, right?