[time-nuts] Time Dilation tinkering

Arnold Tibus arnold.tibus at gmx.de
Wed Mar 22 13:07:32 EDT 2017


Am 22.03.2017 um 15:56 schrieb jimlux:
> On 3/22/17 4:04 AM, Angus wrote:
>> On Tue, 21 Mar 2017 13:08:56 +0100, you wrote:
>>
>>> On Tue, 21 Mar 2017 13:38:51 +1100
>>> Hugh Blemings <hugh at blemings.org> wrote:
>>>
>>>> This got me to wondering if a Rubidium based standard might do the
>>>> trick
>>>> - the Efratom SLCR-101s seem readily available for ~USD$200 mark.
>>>
>>> As TvB wrote, a single one will not do the trick. You will need
>>> a stability 1e-14 @1d. IIRC most Rb standards floor out at 1e-12 to
>>> 1e-13
>>> somewhere between 1k and 100k seconds. Even the Super-5065 has a floor
>>> of about 3-4e-14 (unless our friends here improved on this already).
>>>
>>> There will be a few things that you will need to do, if you want to go
>>> with Rubidiums:
>>> 1) Stabilize or compensate for environmental effects (temperature,
>>> air pressure)
>>> 2) Build ensembles of Rb clocks.
>>>
>>
>> Hi,
>>
>> Looking back at an old plot I did of a temperature controlled and air
>> pressure compensated LPRO against an M12+T, the Hadamard Deviation of
>> the 1000s averages of the 1PPS measurement was about 5E-14 at 1 day.
>> A large part of that was likely the GPS, so with a better rubidium
>> like an FRK-H in a sealed and temperature controlled enclosure you
>> might be around 1E-14 at 1 day.
>>
>> The bit that I'm not so sure about is the travelling. A long period of
>> movement, vibration, magnetic  fields, etc. all adding in could
>> obscure the effects of time dilation.
>>
>> It might be quite possible, although a nearby mountain and a friend
>> with a helicopter would make it a lot easier!
>>
>
> No tall mountains in Australia, but...
>
> Pikes Peak in the US is 14114 ft, 4304m and has a road to the top. Of
> course the base is at about 5000 ft/1600 m
>
> In EU, there's probably a Seilbahn of some sort pretty high up in the
> Alps, although probably not to 4000m.

I like the englisch word 'Seilbahn' ;-)

Yes, not fully up to 4000 m, but there are in fact quite close to the
possibilities I know:

1. Klein Matterhorn, Walliser Alpen, Schweiz
Bergstation: 3820 m,

2. Aiguille du Midi, France
Télépherique de l’Aiguille du Midi
from Chamonix
Bergstation: 3777 m
Gourmet-Restaurant, 3842 m

Enjoy, good luck!

Arnold



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