Richard B. Gilbert wrote:
I don't believe that accuracy of 1 microsecond , or less, is obtainable without without installing a GPS Timing Receiver or an atomic clock of some sort.
He asked for an offset of 1 microsecond (presumably RMS or 90 percentile?), not an accuracy of 1 microsecond.
If you ignore systematic errors, an offset of 1 microsecond corresponds to an accuracy in the low 100s of nanoseconds.
However, without special instrumentation of both hardware and software, he won't be able to measure the systematic error, so an RMS offset in the one microsecond region could be associated with a rather larger systematic error.
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