I think the TV-network-synchronization NBS article you are talking about, is this: http://tf.nist.gov/general/pdf/237.pdf
Tim N3QE On Thu, Nov 12, 2015 at 3:04 AM, Hal Murray <[email protected]> wrote: > > [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. > _______________________________________________ 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.
