[IGSSTATION-1289]: NPLD: Change of External Frequency Standard

["Peter Stacey" <peter.stacey @ npl.co.uk>]

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IGS Station Mail          19 Dec 02:58:21 PST 2006      Message Number 1289
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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


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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

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