So, the see of Neuchatel has 429 meter o.NN, the city of Neuchatel/Neuenburg is on so 430-470m. Somebody can calculate yet a correction - if needed/likes... K.
2010/9/2 K. Szeker <[email protected]>: > I have the coodinates yet too(but not the hight over see): > 46.991347,6.913806 > > regards > > 2010/9/2 K. Szeker <[email protected]>: >> 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.
