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...@@ -38,6 +38,10 @@ UTC. ...@@ -38,6 +38,10 @@ UTC.
### Was the PTB calibration done with a traveling clock? If so, did you apply relativistic corrections to its time base? ### Was the PTB calibration done with a traveling clock? If so, did you apply relativistic corrections to its time base?
The [PTB calibration](https://www.ohwr.org/project/cngs-time-transfer/wikis/Documents/PTB-calibration-report) was done with
a traveling GPS used for time comparison between metrology
labs.
### What is the impact of the Ionosphere on the accuracy of the time transfer? ### What is the impact of the Ionosphere on the accuracy of the time transfer?
### Why the GPS receivers are installed on the surface? ### Why the GPS receivers are installed on the surface?
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