Regarding Observation 2548778 …
There is a faint track, it moves from lower to higher frequnecies, so i guess it is constant terrestial source apparently shifted by the doppler correction. right?
http://network.satnogs.org/observations/2550892/
I got the same. That S/tangent shape is terrestrial, I’m pretty sure.
On my observation there’s a faint hint of something to the left of centre late in the observation but I’m not convinced.