[time-nuts] Time nut newbie

[Jim Palfreyman]

Buy a cheap rubidium off ebay and use it to drive a micro-controller and
write some clock software.


On 1 May 2013 11:57, Rex <rexa at sonic.net> wrote:

> It doesn't affect the general magnitude conclusions by Bruce, but as long
> as we are making corrections, my calculator seems to think
> 60 * 60 * 24 * 12 = 1036800 seconds in 12 days, not 1024800.  That does
> come out to 115.7 days for 1 sec error. Maybe the 12-day number was a typo?
>
> -Rex
>
>
>
> On 4/30/2013 12:57 PM, Bruce Griffiths wrote:
>
>> 12 days is 1024800 s ie just over 1 million seconds so a frequency offset
>> of 0.1ppm results in a time error of ~ 0.1s not 1s.
>> 1sec error would occur in just under 116 days,
>>
>> Bruce
>>
>> Bob Camp wrote:
>>
>>> Hi
>>>
>>> If you take a look down in the fine print on the OCXO spec, the aging
>>> rate
>>> is 100 ppb / year in the first year. If you are off by 0.1 ppm (100 ppb)
>>> your clock will gain a second in less than 12 days.
>>>
>>> Bob
>>>
>>>
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