[time-nuts] Update on my previous note regarding NBS television timing reference experiment

[Chuck Harris]

I had one of the remote units for this system many years ago.  I scrapped
the unit and used the cute little 5" Sony Trinitron TV for many years...
I think I still have all of the PCB's that did the line extraction, and
phase locking...

-Chuck Harris

Gregory Muir wrote:
> I did a little digging and managed to find a paper on the original television time
> experiment which was authored by David Howe of NBS, now head of the Time and
> Frequency Metrology Group at NIST.  It can be found at
> http://www.google.com/url?sa=t&rct=j&q=&esrc=s&frm=1&source=web&cd=2&cad=rja&ved=0CDYQFjAB&url=http%3A%2F%2Fwww.researchgate.net%2Fpublication%2F3092613_Nationwide_Precise_Time_and_Frequency_Distribution_Utilizing_an_Active_Code_within_Network_Television_Broadcasts%2Ffile%2F9fcfd5089a1d534c56.pdf&ei=Ze_FUsrXJ-LsyQGY0oHYCw&usg=AFQjCNGw2wK-8_RYN98R_72AlRLcm2BAUA&bvm=bv.58187178,d.aWc
> (Google cached - whew!).
>
> I stand corrected in my assumption that the timing signal was not related to the
> VITS interval in the video signal.  They actually were inserting the signal on
> line 1.  At the time Mr. Howe was involved in the development of the hardware that
> was deployed in the field for the experiment.   He stated that the received code
> provided unambiguous time to 12 hours, with a resolution of 1 nanosecond and
> long-term stability of 10 nanoseconds for 10-second averaging.
>
> It's rather odd as to why I can't remember the sordid details off the top of my
> head regarding a project that took place 42 years ago....
>
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