On Thu, Jan 2, 2014 at 11:10 AM, Gregory Muir <[email protected]> wrote:
> Reading all of this brings back memories of a project I was involved in > back in the early 70's in the Denver area. NBS-Boulder was experimenting > with injecting their time standard into the video of the analog signal > before it hit the transmitter. I bet they encoded it into a single line of the vertical interval. I worked on a similar project at PBS but there it was used that to implement a message broadcast service to send textual messages to selected affiliate stations. It was an outgrowth of the closed-captioning system. PBS didn't want to pay telephone charges to send the same message to all 200 stations in the US when they already had a "pipe" into every station. And I do remember being intrigued with the creation of the network master clock to ensure that all the video sources were synchronized. I also remember the early digital frame buffers that were there to deal with different frame clock phase from non-PBS-network sources. As I recall, WWVB was the preferred frequency reference but I also remember that they had either a couple of Rb or Cs local references. (It was 1980 and my mind is going. So much to remember.) -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 [email protected] +1.916.877.5067 _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
