Re: [time-nuts] Possible replacement for FE5680A

2012-03-12 Thread Azelio Boriani 
This is very interesting: I think you have a precision local clock source
to accept a slowly varying input frequency and "clean" it for the
transmission so that it is the clock source that ultimately dominates the
output stability.

On Mon, Mar 12, 2012 at 2:24 PM, Jim Lux  wrote:

> On 3/12/12 2:20 AM, Azelio Boriani wrote:
>
>> Yes, build three and compare them but your comparator has to have a very
>> low noise floor. I think that in addition to building new higher precision
>> clocks you need to build new lower noise TI counters.
>>
>>
> This is part of the thrill (or frustration) of working at the state of the
> art limit.
>
> At work we build state of the art deep space transponders with very low
> added Allan deviation (4E-16 at 1000 sec).  Figuring out a way to prove
> that they work is often harder than designing and building the actual
> article under test, particularly when you want to demonstrate that it will
> do it with a slowly varying input frequency.
>
>
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Re: [time-nuts] Possible replacement for FE5680A

2012-03-12 Thread Jim Lux 

On 3/12/12 2:20 AM, Azelio Boriani wrote:

Yes, build three and compare them but your comparator has to have a very
low noise floor. I think that in addition to building new higher precision
clocks you need to build new lower noise TI counters.



This is part of the thrill (or frustration) of working at the state of 
the art limit.


At work we build state of the art deep space transponders with very low 
added Allan deviation (4E-16 at 1000 sec).  Figuring out a way to prove 
that they work is often harder than designing and building the actual 
article under test, particularly when you want to demonstrate that it 
will do it with a slowly varying input frequency.



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Re: [time-nuts] Possible replacement for FE5680A

2012-03-12 Thread Azelio Boriani 
Yes, build three and compare them but your comparator has to have a very
low noise floor. I think that in addition to building new higher precision
clocks you need to build new lower noise TI counters.

On Sun, Mar 11, 2012 at 1:10 AM, Jim Lux  wrote:

> On 3/10/12 2:42 PM, Azelio Boriani wrote:
>
>> Amazing, 10 at -19... will it ever be measurable?
>>
>>
>>  build three and compare them?
>
>
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Re: [time-nuts] Possible replacement for FE5680A

2012-03-10 Thread Jim Lux 

On 3/10/12 2:42 PM, Azelio Boriani wrote:

Amazing, 10 at -19... will it ever be measurable?



build three and compare them?

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Re: [time-nuts] Possible replacement for FE5680A

2012-03-10 Thread Bob Camp 
Hi

Measuring it will be a lot cheaper than building a pair of them to feed the 
comparison...

Bob



On Mar 10, 2012, at 5:42 PM, Azelio Boriani  wrote:

> Amazing, 10 at -19... will it ever be measurable?
> 
> On Sat, Mar 10, 2012 at 10:02 PM, Attila Kinali  wrote:
> 
>> On Fri, 9 Mar 2012 15:29:39 +0800
>> Roger Costello  wrote:
>> 
>>> I noticed this which could potentially be a very good thing.
>>> 
>>> 
>> https://newsroom.unsw.edu.au/news/science/nuclear-clock-may-keep-time-universe
>> 
>> The paper they refere to can be found at [1] (and other related stuff
>> can be found on their homepage [2]). Unfortunately, my limited knowledge
>> is not enoug to understand what the paper is really about. The only
>> things i could gather is, that they are using a nucleus angular momentum
>> difference, that seems to be indepedent of everything and probe it trough
>> the interatcion with the electronic cloud... But where this differnece
>> comes from and why it is independent of outside fields is beyond me..
>> 
>> Can someone with more physics knowlege give a small summary of what
>> they did and what makes it so special?
>> 
>>   Attila Kinali
>> 
>> 
>> [1] http://kuzmichlab.gatech.edu/publications/229ThClock_arXiv.pdf
>> [2] http://kuzmichlab.gatech.edu/publications.php
>> --
>> Why does it take years to find the answers to
>> the questions one should have asked long ago?
>> 
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Re: [time-nuts] Possible replacement for FE5680A

2012-03-10 Thread Azelio Boriani 
Amazing, 10 at -19... will it ever be measurable?

On Sat, Mar 10, 2012 at 10:02 PM, Attila Kinali  wrote:

> On Fri, 9 Mar 2012 15:29:39 +0800
> Roger Costello  wrote:
>
> > I noticed this which could potentially be a very good thing.
> >
> >
> https://newsroom.unsw.edu.au/news/science/nuclear-clock-may-keep-time-universe
>
> The paper they refere to can be found at [1] (and other related stuff
> can be found on their homepage [2]). Unfortunately, my limited knowledge
> is not enoug to understand what the paper is really about. The only
> things i could gather is, that they are using a nucleus angular momentum
> difference, that seems to be indepedent of everything and probe it trough
> the interatcion with the electronic cloud... But where this differnece
> comes from and why it is independent of outside fields is beyond me..
>
> Can someone with more physics knowlege give a small summary of what
> they did and what makes it so special?
>
>Attila Kinali
>
>
> [1] http://kuzmichlab.gatech.edu/publications/229ThClock_arXiv.pdf
> [2] http://kuzmichlab.gatech.edu/publications.php
> --
> Why does it take years to find the answers to
> the questions one should have asked long ago?
>
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Re: [time-nuts] Possible replacement for FE5680A

2012-03-10 Thread Attila Kinali 
On Fri, 9 Mar 2012 15:29:39 +0800
Roger Costello  wrote:

> I noticed this which could potentially be a very good thing.
> 
> https://newsroom.unsw.edu.au/news/science/nuclear-clock-may-keep-time-universe

The paper they refere to can be found at [1] (and other related stuff
can be found on their homepage [2]). Unfortunately, my limited knowledge
is not enoug to understand what the paper is really about. The only
things i could gather is, that they are using a nucleus angular momentum
difference, that seems to be indepedent of everything and probe it trough
the interatcion with the electronic cloud... But where this differnece
comes from and why it is independent of outside fields is beyond me..

Can someone with more physics knowlege give a small summary of what
they did and what makes it so special?

Attila Kinali


[1] http://kuzmichlab.gatech.edu/publications/229ThClock_arXiv.pdf 
[2] http://kuzmichlab.gatech.edu/publications.php
-- 
Why does it take years to find the answers to
the questions one should have asked long ago?

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Re: [time-nuts] Possible replacement for FE5680A

2012-03-09 Thread Bob Camp 
Hi

The whole "how do you do an ion standard" thing is expensive even if you
have a national government to fund you... 

Bob

-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of mike cook
Sent: Friday, March 09, 2012 3:09 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Possible replacement for FE5680A

Le 09/03/2012 08:29, Roger Costello a écrit :
> I noticed this which could potentially be a very good thing.
>
>
https://newsroom.unsw.edu.au/news/science/nuclear-clock-may-keep-time-univer
se
Interesting. Thanks for the ref.  I am afraid it will be a while before 
the price drops to $40 shipping included.

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Re: [time-nuts] Possible replacement for FE5680A

2012-03-09 Thread mike cook 

Le 09/03/2012 08:29, Roger Costello a écrit :

I noticed this which could potentially be a very good thing.

https://newsroom.unsw.edu.au/news/science/nuclear-clock-may-keep-time-universe
Interesting. Thanks for the ref.  I am afraid it will be a while before 
the price drops to $40 shipping included.


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[time-nuts] Possible replacement for FE5680A

2012-03-08 Thread Roger Costello 
I noticed this which could potentially be a very good thing.

https://newsroom.unsw.edu.au/news/science/nuclear-clock-may-keep-time-universe

Apologies for the long period watching on the sidelines but I have been 
learning a lot.

Regards,

Roger



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