[time-nuts] Re: Validating GPSDO control loop with simulation and measurement. Is this amount of difference between measurement and simulation to be expected?

[Erik Kaashoek]

Magnus, Bob,
Thanks for the replies.
@Magnus, I need to study your input a bit longer. What I currently fail 
to understand is : Should there be a low pass filter with a 1/100 s 
corner frequency in series with the Vtune when the ADEV of the VC-TCXO 
and the PPS intersect at 100 s? Why not have a Kp of 0.01 instead of an 
additional low pass filter? I understand how the low pass filter can 
help reduce noise from the DAC if needed  or is there another reason?
@Bob, the reason for not converging may be some infrequent disturbances 
of the control loop caused by something not yet identified. Need to do 
some investigation into the cause.
Erik.