[time-nuts] Time syncing WiFi routers using FM radio
tshoppa at gmail.com
Thu Nov 12 07:19:21 EST 2015
I think the TV-network-synchronization NBS article you are talking about,
is this: http://tf.nist.gov/general/pdf/237.pdf
On Thu, Nov 12, 2015 at 3:04 AM, Hal Murray <hmurray at megapathdsl.net> wrote:
> kb8tq at n1k.org 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
> 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
> 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
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