fun satellite thing: there's actually a LOT of old geostationary orbit telecom satellites which are still alive for command and control, and their transponders still work, but they're out of mainstream commercial service because they've long ago exhausted their station keeping propellant. So you need an earth station dish with two axis tracking motorized servos/gears/stepper motors to talk to them reliably.

https://www.google.com/search?client=ubuntu&channel=fs&q=inc...