Scott Manley | The First Geostationary Communications Satellites - The Olympics, The Beatles and Moon Landings @scottmanley | Uploaded 11 months ago | Updated 28 minutes ago
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/ADA267914.pdf
ntrs.nasa.gov/api/citations/19660012402/downloads/19660012402.pdf
ntrs.nasa.gov/api/citations/19670015715/downloads/19670015715.pdf

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