Prerequisites :Administrative requirements for contribution to UTC Technical requirements for contribution to UTC Laboratory information spreadsheet Technical recommendation for UTC(k) ![](/webdb/img/pdf.png)
>> General technical guideline <<
- Atomic clocks :Get clock code hereClock file format ![](/webdb/img/pdf.png)
- Time transfer :List of recent GNSS receivers contributing to UTC and their manufacturer ![](/webdb/img/pdf.png) Global Navigation Satellite System file format (CGGTTS format) :       
GPS only (Version 1 ),
GPS+GLONASS (Version 2),
all GNSS (Version 2E) LZ file format PPP and HD file format TWSTFT file format (ITU-R) CGGTTS and TWSTFT Header examples ![](/webdb/img/pdf.png)
- PSFS (Primary and Secondray Frequency Standards) :Guideline for reporting primary (PFS) or secondary (SFS) frequency standards data for TAI calibration (January 2022) PSFS data file format (May 2020) ![](/webdb/img/pdf.png)
- Other :Meteorological data file format (Oct.2018) ![](/webdb/img/pdf.png)
- CCTF Working Group TAI Relevant information, membership and nomination form ( to be filled by Director of Institute)
If you have not found an answer to your question in this documentation, please contact us ![](/webdb/img/mail.png)
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