The so called atomic clocks that used to be locked to WWVB have switched
over to GPs for higher reliability. My WWVB clocks loose lock when ever
there is a lightning storm within 50 miles but the GPS clocks stay locked.
No one is going to get hurt or killed because of a disabled GPS clock but
it's going to make a lot of people unhappy along with the manufacturers of
the clocks.
Regards.
Max. K 4 O D S.
Email: [email protected]
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----- Original Message -----
From: "Hal Murray" <[email protected]>
To: "Discussion of precise time and frequency measurement"
<[email protected]>
Sent: Friday, June 10, 2011 9:01 PM
Subject: Re: [time-nuts] GPS interference and history...
[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.
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