Hi all, The "Neuchatel MASER" was build by Oscilloquartz in Neuchatel/Switzerland... Maybe somebody has the full coordinates of that :-)
Oscilloquartz SA, http://www.oscilloquartz.com/ Brévards 16 2002 Neuchâtel Switzerland phone : +4132 722 5555 fax : +4132 722 5556 Regards Karesz 2010/9/1 Magnus Danielson <[email protected]>: > On 09/01/2010 09:39 PM, Poul-Henning Kamp wrote: >> >> In message<24c547b54ea34a69bacc4f823bb40...@pc52>, "Tom Van Baak" writes: >>> >>> I found the original copies of both EFOS manuals, along with >>> a few photos. See: >>> >>> http://www.leapsecond.com/museum/efos/ >> >> Interesting. >> >> >> Page 4/3 in the service manual states: >> >> For the Hydrogen Maser, this unperturbed frequency >> is >> f(H) = 1 420 405 751.768 +/- 0.002 Hz >> >> In practice, this frequency is perturbed by >> interaction of the hydrogen atoms with the walls >> of the interaction volume container, doppler >> effects, interactions between the atoms themsel- >> ves, etc. The resulting frequency for the EFOS >> Maser is taken to be >> >> F(o) = 1 420 405 751.689 Hz >> >> I have no idea where the EFOS was produced, but somebody should try >> to calculate the relativistic correction for their height above the >> geoid, and see how much of the systematic 0.079Hz frequency difference >> that explains... > > Neuchatel, which still leaves a bit of unspecified height. > > However, this effect would be cancelled as their cesium clocks would be on > the same height above the geoid (give or take a few meters). > > So, their indication is correct. The C-field also pulls the atoms of course, > which they failed to point out in the cited text. > >> If I were to build a maser myself, I would probably not attempt >> to copy the EFOS, as the large mechanical dimensions add significant >> cost in materials and machining. >> >> I would be much more tempted by a sapphire loaded cavity design like >> this one: >> >> >> http://www.nict.go.jp/publication/shuppan/kihou-journal/journal-vol50no1.2/0304.pdf) >> >> As that brings the mechanics inside the work envelope of main-stream >> CNC machines with the required tolerances. > > Yes, but what is the issues relating to sapphire loading? What's the cost of > the sapphire block and having it machined? > > Cheers, > Magnus > > _______________________________________________ > 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.
