[GPS_Standard] vcxo control averaging?

[Arie Dogterom]

Hello,
I have built the gps controlled standard and am very impressed by the 
intelligent control and monitoring software.
But one question remains:
Say one sets a period of 10*16 seconds to average out the "noise"on the one 
sec impulses. If the vcxo is about correct on frequency the result of the 
counter jumps around 0 but I see deviations of +-4 at times. The PC 
programme statistics picture indicates gradually an average which goes down 
and reaches values around 10^-11. But at the end of the averaging period it 
is possible that just at that moment the result of the 16 sec measurement 
indicates not 0 but + or - 3. In that case, although the frequency is almost 
correct, the control voltage suddenly is changed and the measuring period 
starts again. But now it is possible that the vcxo is slightly set away from 
the correct figure.
I would think a better solution would be that not the momentary deviation 
but the long time average is used to set the control voltage.
Or do I see this incorrectly?.
Arie