English NTSC TV's.

[Mr Hoover]

There's a lot of interesting information on that site.
Think it was somewhere in there I read about tests that were done after the relatively low earth orbit Telstar satellite was launched to check the doppler shift caused by the satellite's motion relative to the ground stations didn't vary the NTSC colour subcarrier frequency much, it ended up being 10-12 Hz from memory which was acceptable.