[time-nuts] Different Thunderbolt versions

Magnus Danielson magnus at rubidium.dyndns.org
Sun Feb 22 19:00:36 UTC 2009


> There are two things you need.   One is frequency, the other is time (PPS).
> 
> If the time is slightly off, that's equivalent to pointing your antenna in a 
> different direction.  You get the same sort of error if the location of an 
> antenna is slightly off.
> 
> I think the Earth's rotation introduces an error that's equivalent to the 
> frequency being slightly off.

There is two effects... the two antennas will experience different 
doppler shifts (assuming object in the sky), which can be canceled out 
fairly easy.
There is also the Sagnac effect which causes an apparent time 
difference, which also can be canceled out fairly easy.

Cheers,
Magnus



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