Content-class: urn:content-classes:message Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Subject: [IGSSTATION-1289]: NPLD: Change of External Frequency Standard Date: Tue, 19 Dec 2006 10:58:18 -0000 Message-ID: <2C2E01334A940D4792B3E115F95B72261AF886@exchsvr1.npl.ad.local> Thread-Topic: NPLD: Change of External Frequency Standard Thread-Index: AccjXJdvk7GDlnDGQlyBv5zb5RwFgA== From: "Peter Stacey" To: Sender: owner-igsstation Precedence: bulk ****************************************************************************** IGS Station Mail 19 Dec 02:58:21 PST 2006 Message Number 1289 ****************************************************************************** Author: Peter Stacey Dear IGS Colleagues, Please note that the external frequency reference for NPLD changed on MJD 54034 (26th October 2006) at 12:00 UTC to a Datum active hydrogen maser. Traceability to UTC(NPL) was not lost however, since the maser became the source of UTC(NPL) at the same time. Users of NPLD data for time and frequency purposes may note a slight change in frequency from that date. I would like to apologise for the various data outages that followed this switch, these were due to various hardware failures in the frequency distribution to NPLD. An updated site log has been submitted to reflect this change. Kind Regards, Peter ------------------------------------------------------------------- Peter Stacey Time, Frequency & The Metre Group National Physical Laboratory Teddington Middlesex TW11 0LW U.K. Tel: +44 20 8943 6311 Fax: +44 20 8943 6529 email: peter.stacey@npl.co.uk ------------------------------------------------------------------- ------------------------------------------------------------------- This e-mail and any attachments may contain confidential and/or privileged material; it is for the intended addressee(s) only. If you are not a named addressee, you must not use, retain or disclose such information. NPL Management Ltd cannot guarantee that the e-mail or any attachments are free from viruses. NPL Management Ltd. Registered in England and Wales. No: 2937881 Registered Office: Serco House, 16 Bartley Wood Business Park, Hook, Hampshire, United Kingdom RG27 9UY -------------------------------------------------------------------