[time-nuts] Time Signals on TV signals

[Richard W. Solomon]

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 <hmurray at megapathdsl.net>
>Sent: May 25, 2009 2:14 PM
>To: Discussion of precise time and frequency measurement <time-nuts at 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.
>
>
>
>
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