Hi Brian,
No unusual GPS blips noticed here with my Z3801a on Long Island, NY either.
The SVN 4 may have caused a holdover event to download a new almanac and
some receivers were not happy doing that if only "seeing" a few birds and/or
poor geometry in NE area at that time.
FCSTDV, or Forecast Delta-V, gives scheduled outage times for Delta-V
maneuvers. The satellite is moved during this maintenance and the user may
be required to download a new almanac.
George, WA2VNV
Message: 4
Date: Fri, 6 Sep 2013 01:06:30 -0400
From: "Brian, WA1ZMS" <[email protected]>
To: Discussion of precise time and frequency measurement
<[email protected]>
Subject: Re: [time-nuts] GPS outage?
Message-ID: <[email protected]>
Content-Type: text/plain; charset=utf-8
John-
I agree. We all should/would have seen
even a minor outage. That's what makes the event from early this week a
rather odd event.
I have personally observed GPS jamming events from truck drivers trying to
prevent being tracked. But those events are very localized it seems and
are well bounded.
I cannot speak for others, but I am on
a presumption/ theory for our vendor supplied gear that the GPS engines
may not have dealt very well with SVN 4 being tagged as "not for use" on
Sept 3 & 4. Just a theory from an RF guy since I have no other
explanation why some gear had issues yet 99% of us Time-Nuts never noticed
an issue.
Oh well......
-Brian, WA1ZMS
<<<SNIP<<<
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