[GPS_Standard] Crystek OCXO

[David Witten]

I believe that the stability spec you mean is claimed to be:

Short term stability -  2x10-11 Sec Allen Variance @ 1 Sec


The full product sheet is at:

http://www.crystekcrystals.com/crystal/spec-sheets/ocxo/CO27VS05DE-02-10_000.pdf

-- Dave

michael taylor wrote:
> On Jan 29, 2008 2:00 PM, David M. Witten II <wittend at wwrinc.com> wrote:
>> The Crystek documentation claims the following:
>>
>>         Tuning range +-1 ppm (min) to +-1.5 ppm (max)
>>           over a 0 vdc (min) +5 vdc (typ.) +10 (max) control range
>>         Phase noise:
>>                  -102 dBc/Hz @ 10 Hz offset
> 
> No frequency stability? Seems an odd parameter to omit for an OCXO.
> 
>> Is there anything anyone can suggest that I should consider about this
>> strategy?  How would I map the control voltage range to the -5v to +5v
>> range without introducing error?
> 
> I think you mean convert the VE2ZAZ's EFC output of -5 to +5V to the 0
> to +10V of the EFC used by the crystal (with 5V being the normal
> 'middle' value.
> 
> Using op-amps to translate the levels would be one way. Here is an
> example for mapping [0, 5] to [-5, 5] which you should be able to
> adapt for your needs.
> <http://www.febo.com/pipermail/time-nuts/2007-December/028752.html>
> 
> -Michael