Regarding Observation 1112685 …
Is that a HRPT signal on the waterfall? What do you guys think
It is hard to say. The HRPT signal has a much larger bandwidth than the 48kHz shown here, so it is not conclusive. I would suggest to study the signal using gqrx to see if it is there, as that can use the full bandwidth of the rtlsdr. Note that for demodulation you probably need even more SDR bandwidth.