[email protected] said: > There's an enormous amount of gear out there that gets timing off of GPS.
That's an interesting claim. Does anybody have any data on the usage of GPS for timing? I assume there is one in every cell tower and one in every 911 call center. Are there other large categories of users? What would it cost to replace all of it? If you wanted to do something like that, what would "it" cover? How about people like us running old recycled gear? (Z3801A, ThunderBolt, ...) I think I saw one last week. It was on a river level measuring station on the Sacramento River. It was a small block building. There was an antenna pointing up into the sky. I assume there is a satellite up there. There was also a small (~3 inch dia) hemisphere antenna. I assume it was GPS. (They had power going into the building (no solar panels) so it should have been simple to get a phone line too.) I'm not sure why they need GPS at the recording house. They know where it is so timing is the only use I can think of. But they could also get that at the receiving end. Millisecond accuracy isn't helpful. Second level accuracy might be interesting if something breaks and you want to know when the wave got to downstream stations. The risetime is probably over a second. -- These are my opinions, not necessarily my employer's. I hate spam. _______________________________________________ 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.
