[time-nuts] GPS interference and history...

Max Robinson max at maxsmusicplace.com
Sat Jun 11 00:59:23 EDT 2011

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.


Max.  K 4 O D S.

Email: max at maxsmusicplace.com

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----- Original Message ----- 
From: "Hal Murray" <hmurray at megapathdsl.net>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Friday, June 10, 2011 9:01 PM
Subject: Re: [time-nuts] GPS interference and history...

> lists at rtty.us 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 
> 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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