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The setting when we found it was "GPS", which seems logical enough. However, when we switched it to "UTC" the time as shown on the front panel was correct, now with "UTC" vertically to the right of the time, and fb1 was then showing the correct GPS time.
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From Keith Thorne:
In the GPS receiver, you are trying to match the IRIG-B output format that is created by the aLIGO IRIG-B Fanout. Since we have to prep the aLIGO IRIG-B Fanout every time there is a leap second coming, I would suspect that we are sending UTC to the IRIG-B receivers. Thus, the GPS receiver needs to be set to that mode.
Soooo, "UTC" is the correct mode for the GPS receiver. |