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.
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