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.
