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### Does this system suffer from any kind of Sagnac effect, related to the rotation of the Earth?
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### Was the PTB calibration done with a traveling clock? If so, did you apply relativistic corrections to its time base?
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### Was the PTB calibration done with a traveling cesium clock? If so, did you apply relativistic corrections to its time base?
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The [PTB calibration](https://www.ohwr.org/project/cngs-time-transfer/wikis/Documents/PTB-calibration-report) was done with
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a traveling GPS used for time comparison between metrology
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labs.
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No it wasn't. The [PTB calibration](https://www.ohwr.org/project/cngs-time-transfer/wikis/Documents/PTB-calibration-report)
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was done with a traveling GPS used for time comparison between metrology
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labs. This unit consisted of a GPS receiver GR50, a SR60 Time interval
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Counter (TIC), a GPS antenna, and ~50m of HELIAX foam coaxial
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cable.
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### What is the impact of the Ionosphere on the accuracy of the time transfer?
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