[time-nuts] Interesting paper: Don't GPSD' your Rb...

WarrenS warrensjmail-one at yahoo.com
Sat May 5 17:59:17 UTC 2012


Magnus wrote:
> "It's sad that they have not described the control algorithm in greater 
> detail."
I have to ask WHY??

The paper is So low tech, It is hardly worth reading, let alone wondering 
how it is done, IF the goal is to learn something a bit advanced.
Maybe I'm just missing the satire here.

I see nothing there that is anything more than a beginner's first project.
The paper is disciplining  a RB Osc using a very poor GPSDO and an overkill 
high end counter.
~ by averaging the Phase difference over "n" time, use that to change the 
freq of a RB using a 16 bit dac giving about 1e-14 frequency steps.


This is not a paper about "Don't  GPSD your RB", as the nut subject line 
suggest.
It seems a better subject line would of been "DON'T discipline your RB with 
a GPS THIS WAY!"
Seems like a pretty lame way of doing it to me.

ws

**********************

----- Original Message ----- 
From: "Magnus Danielson" <magnus at rubidium.dyndns.org>
To: <time-nuts at febo.com>
Sent: Saturday, May 05, 2012 3:33 AM
Subject: Re: [time-nuts] Interesting paper: Don't GPSD' your Rb...


> On 05/03/2012 11:29 PM, Poul-Henning Kamp wrote:
>>
>> This is pretty think, but interesting:
>>
>> http://tf.nist.gov/sim/Papers/Trigo_CPEM_2010.pdf
>>
>
> I interpret this as a GPS slaving of the rubidium.
> Given that there is fairly high stability in both sources, the comparison 
> rate does not have to be stellar.
>
> It's sad that they have not described the control algorithm in greater 
> detail.
>
> Cheers,
> Magnus
>
>
> 





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