Part 3 in my series on communications satellites The first communications satellites could only maintain connections for a short time before their orbits took them below the horizon, to make a stable connection needed a satellite that orbited with the earth a geosynchronous satellite. And that's what Syncom was they used bigger boosters and smarter navigation to get the spacecraft into higher orbits to create the first stable satellite connections.

https://apps.dtic.mil/sti/pdfs/ADA267...
https://ntrs.nasa.gov/api/citations/1...
https://ntrs.nasa.gov/api/citations/1...

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