Jim, I found a good reference for LOFAR clock and sync: http://www.astron.nl/sites/astron.nl/files/cms/PDF/LOFAR_Rep_057_clock_sync.pdf After a quick read, I think they would have been a perfect candidate to use WR, pity it's a bit late. Their system uses quite a lot of cables to achieve (worse than) what WR does with a single fiber, and there is no mention of cabling delay compensation anywhere, which makes me think they must be doing it by hand through some kind of calibration campaign at the beginning of the run. We have done this in the past and it's both time-consuming and error-prone, not to speak about thermal effects you just can't deal with in this way. Anyway an interesting read. Thanks again for the idea.
Javier On Thu, Sep 10, 2009 at 4:34 PM, Lux, Jim (337C) <[email protected]>wrote: > > > > On 9/10/09 4:29 AM, "Javier Serrano" <[email protected]> > wrote: > > > Dear nuts, > > > > We have this ongoing project whose aim is to synchronize roughly one > > thousand stations (typical distances around 10 km) to within 1 ns using > > Ethernet: > > http://www.ohwr.org/twiki/bin/view/OHR/WhiteRabbit/WhiteRabbit > > > Interesting stuff... > > Have you looked at what the giant phased array radio telescopes are doing? > LOFAR and SKA both cover large areas, and have similar timing requirements. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
