[time-nuts] Time syncing WiFi routers using FM radio

[Tim Shoppa]

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 <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
> 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.
>
>
>
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