[time-nuts] hm H Maser

Bob Camp kb8tq at n1k.org
Sun Jan 8 10:22:54 EST 2017


I guess the question then would be: 

Is a H Maser that runs 6.6 x 10^-12 at 1 second worth the trouble? 

With 100 KHz / C temperature coefficients running around, getting 
good stability in a real world setting at 1 day will be “interesting”. 

Just for reference:  The MH-2010 data sheet shows 1.5x10^-13 at 
1 second for the “cheap” version and 8x10^-14 at one second for
the low noise version.  Data showing the 5065 Rb at 1x10^-12 at
1 second is running around on various web sites. 

The NIST paper suggests that they made several prototypes before
they got one good one working. That’s a lot of “fun and games” with
ceramic machine lathes and Rb magnetometers…..

The punch line being - would the same effort / cost / many years of time be more
fruitful (ADEV wise) doing a large package Rb (like a 5065) ?  Based on
the number of people making them in volume over the years, Rb’s appear to 
be the easier item to debug, design, and build. 


> On Jan 8, 2017, at 6:01 AM, Bruce Griffiths <bruce.griffiths at xtra.co.nz> wrote:
> You could try a cavity like the one in;http://tf.nist.gov/general/pdf/156.pdf
> This avoids the requirement for a fused quartz storage bulb.
> Bruce 
>    On Sunday, 8 January 2017 11:33 PM, timeok <timeok at timeok.it> wrote:
> Hi,
> the thought of being able to work on building a H Maser has always accompanied me in recent years.
> I fully understand the many difficulties of this project and also the necessity of a work team.
> Maybe a Passive Maser would be easiest to implement, but I do not know in detail the processes
> of construction of the physical part of the interrogation.
> Honestly, I would love to spend My next ten years on a project like this, but...
> my curiosity is to know of there are other people with these mental disorders on earth.
> If you want to answer me.
> Luciano
> www.timeok.it
> _______________________________________________

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