[time-nuts] GPSDO control system

Bob Camp lists at rtty.us
Sun Mar 23 14:55:03 EDT 2014


If you have a source of “noise” that is not in your model *and* it’s significant, then your model will not predict the outcome. That’s true if it’s in or if it’s outside the loop bandwidth.


On Mar 23, 2014, at 2:27 PM, Hal Murray <hmurray at megapathdsl.net> wrote:

>> 4) How much do the DAC, reference, op-amps, resistors, capacitors, drift with time? 
> Assuming constant temperature and supply voltage...
> What is the time scale for parts drifting?  Is it very low frequency so well 
> within the loop bandwidth or is it jumps that will be hard to filter out?
> What happens if temperature or voltage is not constant?  Are the changes 
> reasonably linear with temperature/voltage?
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