[time-nuts] Fundamental limits on performance

[Bruce Griffiths]

Rick Karlquist wrote:
> Lux, Jim (337C) wrote:
>   
>>> impurities.  The JHU crystals are apparently in some type of glass
>>> enclosure which can take the high temperatures, and the paper seemed to
>>>       
>
> The processing temperature is limited by the phase change of the
> quartz.  Above a certain temperature, it is permananently changed
> to another form that is useless for oscillators.  Is there any
> evidence that these crystals are actually baked out at a higher
> temperature than cold weld copper packaged ones?  The link to
> JHU was broken.
>
> Rick Karlquist N6RK
>   
try:
http://www.jhuapl.edu/areas/nss/fact_sheets/07-00963-uqo.pdf

http://tycho.usno.navy.mil/ptti/ptti2004/paper35.pdf

Bruce