[time-nuts] Ronald Held's main question

WB6BNQ wb6bnq at cox.net
Tue Dec 18 08:13:26 UTC 2007


Hi Hal,

Yes I remember them.  Two versions existed, one used for common view with line 10
and the other one used the color burst frequency which was lock to a Rb source at
the network.  It was only good when a networked program was being aired.  Both
are referred to in the links I provided.  I have, somewhere, the actual paper
article about the second one with schematics, etc..

Bill....WB6BNQ


Hal Murray wrote:

> > Here are 3 Hewlett Packard appnotes that are in the same vain as the
> > NBS 140 booklet.  In many ways these HP items are better written.  The
> > first one was written in 1961.  The second one is an update (1974), as
> > is the third (1976).  Each are different and equally worth having on
> > the shelf.
>
> Speaking of neat old publications...
>
> It was probably in the late 70s that a friend showed me a small booklet from
> NBS.
>
> It was describing how to use TV signals to calibrate your local clock.  I
> think NBC and HP cooperated.
>
> I think the story was that NBC had their whole network of TV stations locked
> to a master clock.  It was very stable except for jumps when the phone
> company rewired some link.  I think they used to measure various sites
> monthly and publish the differences between local tick and correct time.
>
> Does anybody remember that one?
>
> --
> These are my opinions, not necessarily my employer's.  I hate spam.
>
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