[time-nuts] quartz drift rates, linear or log

Charles Steinmetz csteinmetz at yandex.com
Sat Nov 12 18:51:10 EST 2016

Attila wrote:

> Yes, depending on the data you show, it is not clear
> whether one should do a linear or a logarithmic fit.

When the purpose is correcting a GPSDO local oscillator during holdover, 
it depends on how long one expects to trust the corrected frequency. 
Practical realities make it pointless to trust corrections longer than a 
day or so, if that long.  At that scale, these all look pretty linear.

NB: That may *not* be the case for a TCXO, or a crappy OCXO.  But then, 
it would probably be pointless to correct these for longer than an hour 
or so, at which scale they also may look linear.

Best regards,


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