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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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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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### What is the impact of the Ionosphere on the accuracy of the time transfer?
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### Why the GPS receivers are installed on the surface?
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