[time-nuts] Ronald Held's main question
WB6BNQ
wb6bnq at cox.net
Tue Dec 18 03:13:26 EST 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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