[time-nuts] Homebrew primary standard?

Don Collie donmer at woosh.co.nz
Sat Jul 28 19:55:51 EDT 2007


Sorry, I forgot three of these :   ;-)......Don C.


----- Original Message ----- 
From: "Don Collie" <donmer at woosh.co.nz>
To: "Tom Van Baak" <tvb at leapsecond.com>; "Discussion of precise time and 
frequency measurement" <time-nuts at febo.com>
Sent: Saturday, July 28, 2007 1:00 PM
Subject: Re: [time-nuts] Homebrew primary standard?


> ); SAEximRunCond expanded to false
> Errors-To: 
> time-nuts-bounces+donmer=woosh.co.nz+donmer=woosh.co.nz at febo.com
>
> It is possible to build a standard, of very good long term stability, by
> amplifying the radiation produced by a simple incandesent light bulb. The
> frequency produced is well within the capabilities of present
> technology......................................Don C.
>
>
> ----- Original Message ----- 
> From: "Tom Van Baak" <tvb at LeapSecond.com>
> To: "Discussion of precise time and frequency measurement"
> <time-nuts at febo.com>
> Sent: Saturday, July 28, 2007 5:59 AM
> Subject: Re: [time-nuts] Homebrew primary standard?
>
>
>> ); SAEximRunCond expanded to false
>> Errors-To:
>> time-nuts-bounces+donmer=woosh.co.nz+donmer=woosh.co.nz at febo.com
>>
>>> Has there been any attempts (or successes) at someone outside of a
>>> national laboratory, and commercial R&D groups to build a primary
>>> frequency/time standard?
>>
>> Two attempts to build hydrogen masers that I know of; little
>> or no progress.
>>
>>> I am not sure if there is anything that would prevent an individual
>>> from building a cesium standard of the quality seen in early models
>>> from NPL and NIST, or an industrial style (compact Ramsey cavity)
>>> standard.
>>>
>>> -Michael
>>
>> Yes, it would be possible. I know that several of us have
>> considered it, for a few minutes at least.
>>
>> It would require some expertise in physics, electronics,
>> glass and metal fabrication, vacuum systems, magnet
>> design, electron multipliers, and who knows that else.
>> You'd go through many prototypes. To see if it's working
>> you might want another one in-house.
>>
>> You'd learn a great deal. It would be an amazing story.
>> In the end, you'd end up with a standard accurate to one
>> part in ten to the 10th or 11th that would work for hours
>> or even days at a time.
>>
>> The reason no one has tried it, I believe, is that you can
>> get the same or better accuracy with a simple $75 GPS
>> receiver today. It would seem motivation for the project
>> would be the biggest problem.
>>
>> /tvb
>>
>>
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>
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