From bill@tycho.usnogps.navy.mil Fri Apr 9 10:38:06 EDT 1999
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From: Bill Bollwerk
Message-Id: <199904091437.OAA10959@tycho.usnogps.navy.mil>
Subject: TurboRogue 1pps Jump
To: jimr@maia.usno.navy.mil (Jim Ray)
Date: Fri, 09 Apr 1999 14:37:49 UTC
Cc: linda@gracie.grdl.noaa.gov, sth@tycho.usnogps.navy.mil
X-Mailer: Elm [revision: 212.4]
Status: RO
Jim,
The TR receiver experienced another change this morning in the 1pps
measurements. The 1pps changed between MJD 51277.01388 and 51277.02777 from
2.777881E-06 to .2452434 and has remained at this new level.
Bill
From linda@lynx.grdl.noaa.gov Mon Apr 12 07:37:30 EDT 1999
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From: linda@lynx.grdl.noaa.gov
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Subject: AMC2 weekend data
To: jimr@maia.usno.navy.mil, bill@tycho.usnogps.navy.mil
Date: Mon, 12 Apr 1999 7:37:03 EDT
Cc: linda@gracie.grdl.noaa.gov (Linda Nussear)
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Status: RO
Hi Jim, Hi Bill,
The data from AMC2 was not.
AMC2 stopped tracking on day 099 at 00:09 UTC.
I restarted the receiver this morning. This seems to
coinside with the ps1 drop that Bill mentioned last
Friday. I think there is a definite problem.
-Linda
From sth@tycho.usnogps.navy.mil Mon Apr 12 16:43:44 EDT 1999
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From: Steven Hutsell
Message-Id: <199904122043.UAA20096@tycho.usnogps.navy.mil>
Subject: AMC TurboRogue
To: jimr@maia.usno.navy.mil
Date: Mon, 12 Apr 1999 20:43:19 UTC
Cc: bill@tycho.usnogps.navy.mil, mm@aitken.usno.navy.mil
X-Mailer: Elm [revision: 212.4]
Status: RO
Hi Jim:
The latest AMC TurboRogue jump occurred at around 1030 UTC, today, 12 Apr 1999.
Steven
From jimr Tue Apr 13 09:47:08 EDT 1999
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Tue, 13 Apr 1999 09:47:02 -0400 (EDT)
From: Jim Ray (USNO 202-762-1444)
Message-Id: <199904131347.JAA18287@maia.usno.navy.mil>
Subject: Re: AMC TurboRogue
To: sth@tycho.usnogps.navy.mil
Date: Tue, 13 Apr 1999 9:47:02 EDT
Cc: bill@tycho.usnogps.navy.mil, mm@aitken.usno.navy.mil,
paul@tsee2.usno.navy.mil (Paul Wheeler (USNO/TS)),
linda@gracie.grdl.noaa.gov (Linda Nussear (NOAA/CIGNET)),
miranda@tango.grdl.noaa.gov (Miranda Chin (NOAA/CIGNET)),
jimr@maia.usno.navy.mil
In-Reply-To: <199904122043.UAA20096@tycho.usnogps.navy.mil>; from "Steven Hutsell" at Apr 12, 99 8:43 pm
X-Mailer: Elm [revision: 212.4]
Status: RO
> From: Steven Hutsell
> Subject: AMC TurboRogue
> To: jimr@maia.usno.navy.mil
> Date: Mon, 12 Apr 1999 20:43:19 UTC
>
> Hi Jim:
>
> The latest AMC TurboRogue jump occurred at around 1030 UTC, today, 12 Apr 1999.
>
> Steven
>
This was caused when Linda Nussear manually restarted the receiver tracking
at that time. The tracking had stopped 3 days earlier at the time of the
previous 1 pps glitch reported by Bill:
> From: Bill Bollwerk
> Subject: TurboRogue 1pps Jump
> To: jimr@maia.usno.navy.mil (Jim Ray)
> Date: Fri, 09 Apr 1999 14:37:49 UTC
>
> Jim,
>
> The TR receiver experienced another change this morning in the 1pps
> measurements. The 1pps changed between MJD 51277.01388 and 51277.02777 from
> 2.777881E-06 to .2452434 and has remained at this new level.
>
> Bill
Based on the observed behavior, when the 1 pps glitches by an enormous
amount (physically implausible, as in this case reported by Bill), then
most likely the receiver has stopped tracking. Linda tells me that
when this happens to TurboRogues, they start back up themselves at the
next midnight. For some reason, this retrofitted receiver doesn't do
that so it would be helpful if you could check the receive tracking
when you see a huge 1 pps glitch. If it is not tracking, then please
restart it or let Linda know.
Meanwhile, I will contact AOA about this problem. It does not seem like
the receiver should behave this way. If worse comes to worse, I will
divert delivery of the next retrofit to Schriever to swap with the
receiver there now and send it back to AOA to be checked.
Thanks for the problem reports.
--Jim