The NBS published a booklet on constructing a device that could receive the sync signals and provide a reasonable secondary frequency standard. I still have that book around in some box. I should look for it.
IIRC, the signal originated from a Cesium standard and was used to sync the color so MTM didn't have purple hair !! 73, Dick, W1KSZ -----Original Message----- >From: Hal Murray <hmur...@megapathdsl.net> >Sent: May 25, 2009 2:14 PM >To: Discussion of precise time and frequency measurement <time-nuts@febo.com> >Subject: Re: [time-nuts] Time Signals on TV signals > > >> Why did TV stations stop broadcasting time signals? HDTV requirements? > >One thing that may be relevant.... > >Many years ago, all the TV sources were kept in sync so there wasn't any >glitch when they switched feeds. The sync timing was distributed from at >atomic clock at network headquarters. The time of day probably piggybacked >on that. > >I remember an old NBS booklet describing it. That was back in the late 70s. >(It's probably a valuable collectors item now.) I think HP and NBS used to >publish a table of delays for several major TV stations. Somebody on this >list will probably recognize that description. > >The breakthrough that got around the timing requirement was frame buffers. >(Thank Moore's law.) > > >> Could a cable company interfere with the time signals? > >Thanks for the laugh. :) > >Cable companies do all sorts of strange things. > > >-- >These are my opinions, not necessarily my employer's. I hate spam. > > > > >_______________________________________________ >time-nuts mailing list -- time-nuts@febo.com >To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
