From SchuplB@thorin.atsc.allied.com Tue Apr  7 10:20 EDT 1998
Received: from gemini.gsfc.nasa.gov by Maia.usno.navy.mil with ESMTP
	(1.37.109.24/16.2) id AA164538846; Tue, 7 Apr 1998 10:20:47 -0400
Return-Path: 
Received: from SLRAL2.ATSC.ALLIED.COM by gemini.gsfc.nasa.gov; Tue, 7 Apr 1998 09:53:11 -0400
Received: from thorin.atsc.allied.com ([198.186.48.34]) by SLRAL2.ATSC.ALLIED.COM with SMTP;
          Tue, 7 Apr 1998 9:52:25 -0400
Received: from Microsoft Mail (PU Serial #1122)
  by thorin.atsc.allied.com (PostalUnion/SMTP(tm) v2.1.9h for Windows NT(tm))
  id AA-1998Apr07.094900.1122.1494588; Tue, 07 Apr 1998 09:49:08 -0400
From: SchuplB@thorin.atsc.allied.com (Schupler, Bruce R.)
To: ops@gemini.gsfc.nasa.gov
Message-Id: <1998Apr07.094900.1122.1494588@thorin.atsc.allied.com>
X-Mailer: Microsoft Mail via PostalUnion/SMTP for Windows NT
Mime-Version: 1.0
Content-Type: text/plain; charset="US-ASCII"
Organization: AlliedSignal Technical Services Corporation
Date: Tue, 07 Apr 1998 09:49:08 -0400
Subject: Trimble and FTS GPS Timing Receivers
Status: RO


We are attempting to identify those VLBI stations who are still using the   
Trimble 5000A or
FTS 8400 GPS timing receivers as their primary (or only) means of   
determining GPS time.
These receivers are in standard rack mounts, are approximately 15 cm   
tall, and have a
blue two line display.

The present information that we have is that these receivers will fail to   
operate properly when
the GPS week number rolls over from 1023 to 0 in August, 1999.

If you use either of these receivers, please let me know.

Regards.

Bruce Schupler
ATSC VLBI Manager
schuplb@thorin.atsc.allied.com