I have a copy of some data from December, 2019 SatNOGS Observations that you can possibly use for samples. It may be easier/nicer to pull down instead of hitting network.satnogs.org API, if you just want sample data to work with. It is located here:
https://ml.spacecruft.org/download/
It has 178,092 observations. Note, each observation is a directory with an observation ID, so the download/ directory has 178,092 subdirectories (!). The subdirectories have a json file of the observation pulled from network.satnogs.org, a waterfall .png if available, and an .ogg audio file from archive.org, if available. Here is the range:
https://ml.spacecruft.org/download/1292434/
https://ml.spacecruft.org/download/1470525/
You can more easily pull the data using rsync at this URL:
rsync://ml.spacecruft.org/download/
Note: this will take ~5 minutes to begin to download. Total archive size is around a terabyte.
Happy hacking,
-Jeff