> Message: 6 > Date: Sun, 25 Sep 2011 15:41:03 -0700 > From: Jim Lux <[email protected]> > To: [email protected] > Subject: Re: [time-nuts] Fast than light neutrino > Message-ID: <[email protected]> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > On 9/25/11 3:26 PM, Hal Murray wrote: >> >> [email protected] said: >>>> A fiber-based time-transfer would be nice complementary as it would provide >>>> an independent timing path. >>> Any ideas on how to proceed? This is unknown territory for me. >> >> You can get a lot of good ideas from the radio astronomers. It's been >> discussed here in the past, but I don't know what terms to use when searching >> the archives. I think it was mostly pointers to their papers. They were >> interested is much shorter distances. I think it was 10-20 km. >> >> >> The idea is to send a signal in both directions over the same fiber. If it's >> the same fiber, the transit times are likely to be the same in both >> directions. If you send a pulse out and back, you can assume the time the >> pulse arrived at the far end was half the round trip time after it left the >> start. >> >> >> Whatever you do, it will require a lot of cooperation from the people who own >> the fibers. >> > > The Deep Space Network do lots of this kind of thing for interferometry. > >
Normally this is accomplished by using maser clocks, usually locked to a GPS PPS. - Colby _______________________________________________ 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.
