From jimr@maia.usno.navy.mil Wed Jul 22 09:17:19 EDT 1998
Received: (from jimr@localhost) by maia.usno.navy.mil (8.7.5/8.7.3) id JAA03830 for gpst@maia; Wed, 22 Jul 1998 09:13:44 -0400 (EDT)
From: Jim Ray (USNO 202-762-1444) 
Message-Id: <199807221313.JAA03830@maia.usno.navy.mil>
Subject: clock glitches & planned changes at AMCT
To: gpst@maia.usno.navy.mil
Date: Wed, 22 Jul 1998 9:13:44 EDT
X-Mailer: Elm [revision: 212.4]
Status: RO

Since its installation in March at the Schriever Air Force Base (formerly,
Falcon AFB) in Colorado Springs, CO, the AMCT receiver has experienced
resets of its internal clock at irregular intervals (several days to
several weeks).  Efforts have been underway to determine the cause for
these resets but no progress has been made.  Naturally, clock resets are
a major obstacle for timing studies, which is the main purpose for this
station.

In an effort to rectify this situation, we plan to replace the choke-ring
antenna and TurboRogue receiver with identical units within the next
several weeks.  The replacement system is now being checked by our
colleagues at NOAA, for which we are very grateful.  A more detailed
message will be sent when the changes and schedule are better defined.

We apologize for the disruption this change will cause but are hopeful
that improved performance will result.

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Jim Ray                                   e-mail: jimr@maia.usno.navy.mil
U.S. Naval Observatory, EO Dept.          phone : 202-762-1444
3450 Massachusetts Avenue, NW             fax   : 202-762-1563
Washington, DC  20392-5420
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