Observation 4648421: CAS-4B (42759)

Regarding Observation 4648421

What does this noise look like to everybody? or any ideas as to why the signal fades? This is a rotator ground station. I do not have the stepper motor cables shielded and they are in the same box as the SDR, I have a feeling it’s that but wanted to get second opinions before I tear it down and change out the cabling and relocate the sdr.