[time-nuts] Ronald Held's main question

Hal Murray hmurray at megapathdsl.net
Tue Dec 18 03:05:29 EST 2007


> 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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