[email protected] said: > For time sync, broadcast signals are a pretty well studied topic. Sync > signals from TV stations are a much better ...
Many years ago, I think it was late '70s, a friend showed me a blurb from NBS. They were distributing time by piggybacking on NBC's signal. NBC had atomic clocks at their headquarters and a collection of links from the phone company running to all their stations. The stations locked on to the upstream signal. So the whole system ran in lock step give or take some propagation delay. That was needed so they could switch between local and network signals without trashing the picture. That was long before frame buffers. I think it was HP that measured the signal in the Silicon Valley area. NBS published and distributed the offset. Does anybody remember that booklet? Did I get the story reasonably accurate? -- These are my opinions. I hate spam. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
