[time-nuts] GPS interference and history...
jfor at quik.com
Sat Jun 11 02:21:16 UTC 2011
Maybe the site has other sensors, like seizmographs or groundwater level
that are not obvious.
> lists at rtty.us said:
>> There's an enormous amount of gear out there that gets timing off of
> That's an interesting claim. Does anybody have any data on the usage of
> for timing?
> I assume there is one in every cell tower and one in every 911 call
> Are there other large categories of users?
> What would it cost to replace all of it? If you wanted to do something
> that, what would "it" cover? How about people like us running old
> 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
> pointing up into the sky. I assume there is a satellite up there. There
> 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
> 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
> the wave got to downstream stations. The risetime is probably over a
> These are my opinions, not necessarily my employer's. I hate spam.
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