[time-nuts] Maser manual

K. Szeker szeker.k at gmail.com
Thu Sep 2 13:40:26 UTC 2010


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 <szeker.k at gmail.com>:
> I have the coodinates yet too(but not the hight over see):
> 46.991347,6.913806
>
> regards
>
> 2010/9/2 K. Szeker <szeker.k at gmail.com>:
>> 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 <magnus at rubidium.dyndns.org>:
>>> On 09/01/2010 09:39 PM, Poul-Henning Kamp wrote:
>>>>
>>>> In message<24C547B54EA34A69BACC4F823BB4036F at 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
>>>
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>>
>




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