[time-nuts] RE: phase locking Rb to GPS

[Robert Lutwak]

Careful, there's no such thing as a free lunch.  Reducing the power to the 
oscillator improves the long-term stability (drift) at the expense of 
short-term stability.

-RL

------------------------------------------------------------
Robert Lutwak, Senior Scientist
Symmetricom - Technology Realization Center
34 Tozer Rd.
Beverly, MA 01915
(978) 232-1461   Voice           RLutwak at Symmetricom.com   (Business)
(978) 927-4099   FAX             Lutwak at Alum.MIT.edu  (Personal)
(339) 927-7896   Mobile
----- Original Message ----- 
From: "Brooke Clarke" <brooke at pacific.net>
To: "Richard H McCorkle" <mccorkle at ptialaska.net>; "Discussion of precise 
time and frequency measurement" <time-nuts at febo.com>
Sent: Sunday, October 23, 2005 2:29 PM
Subject: Re: [time-nuts] RE: phase locking Rb to GPS


> Hi Richard:
>
> It's my understanding that this optimization can be done by changing the 
> oscillator power level at the crystal.
>
> In the case of the 32768 Hz watch crystal, it must be run a very low power 
> and it has a very low aging rate when compared to higher frequency 
> crystals that are typically run at higher power levels.  I think this is 
> related to the crystal throwing off atoms, so more power means more 
> acceleration and more atoms thrown off.
>
> Have Fun,
>
> Brooke Clarke, N6GCE
>
> -- 
> w/Java http://www.PRC68.com
> w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
> http://www.precisionclock.com
>
>
> Richard H McCorkle wrote:
>
> . . .  snip . .
>
>>Since both units are the same model, but with different
>>P/N and both meet the OCXO134-10 spec but have different characteristics I
>>believe they were each optimized for a different characteristic when
>>originally ordered, one for low aging, and one for high stability.
>>
> -- 
> w/Java http://www.PRC68.com
> w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
> http://www.precisionclock.com
>
>
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