Quick overview of the various downlinks from Inmarsat satellites across multiple radio frequency bands.
Note that I called the satellite hosting S-EAN "Hellas Sat 2", in reality this is Hellas Sat 3
Jaero website with a lot of extra info:
https://jontio.zapto.org/hda1/jaero.html
Thebaldgeek's website with even more info on air traffic tracking using more than just Inmarsat:
https://thebaldgeek.github.io/
Timestamps:
00:00 - Introduction
02:02 - L-band overview
13:09 - L-band Aero/ACARS
21:18 - S-band S-EAN (Hellas Sat 3*)
25:13 - C-band and ADS-C
34:10 - C-band telemetry
35:46 - 20 GHz beacon
37:55 - Outro