I was thinking more in terms of remotely located devices. That is, not at the same physical position where the sync signal is transmitted over some reliable medium. In that case, one will have to know the relative vertical displacement.
Also, as I think further, in principle the local terrain at each location plays a role as well. Jeff Jeffrey K. Okamitsu, PhD, MBA +1-609-638-5402 US Mobile Phone +1-240-421-0692 GSM Mobile Phone ________________________________ From: Magnus Danielson <mag...@rubidium.dyndns.org> To: time-nuts@febo.com Sent: Wed, September 29, 2010 1:51:30 PM Subject: Re: [time-nuts] Next Generation Time/Frequency Standards May Require Provisions Preventing Vertical Displacement On 09/29/2010 06:56 PM, Jeffrey Okamitsu wrote: > Actually, as I think about this, it will be impossible to "calibrate" another > device unless one knows the vertical displacement between the standard and the > DUT AND a suitably adequate (read: easy to use) algorithm for accounting for >the > effect of gravity can be developed. You can compare two standards by levelling their gravitational centers (similar to phase centers of GPS antennas) to the same level or within same level to what degree they are comparable too. Wither they need to be within 1 mm, 100 mm, 10 m or 1 km depends on the quality of the oscillators. Cheers, Magnus _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.