The next step would be to either transfer directly or to upload the phase data to a central location where it could be processed together to estimate  everyone's offset to the average at once. A DMTD will be needed somewhere to evaluate performance, but this needs only to be done somewhere rather than everywhere. 

Snyder which took inspiration from ways to get laser frequency estimates quickly. The overlapping technique came to be introduced alongside the tau pre-filtering for the modified Allan Deviation, as can be found in the original MDEV article. > 2) > Regardless of back-to-back or overlap, there's also the question of how many points to plot.

I could count the number of crossings over time and estimate the angle of the phase crossing, but I can't really be sure of the direction.  Also, since this is not a timing receiver, it tends to wander around about 10-20 ns.  So, that wander might be the only reason for a +/- count. 

But if PIDs were so wonderful, then there wouldn't be all sorts of "auto-tuning" PIDs out there (which basically complexify things by trying to estimate the actual plant model function, and then optimize the P,I, and D coefficients). PID controllers don't do well when there's a priori side knowledge available.

kb8tq@n1k.org writes: Hi If: 1) You are after better than 1.0 x 10^-13 accuracy 2) You are getting 1 to 9x10^-9 at one second ADEV out of your GPS 3) You have a telecom Rb with 1 to 5x10^-10 temp coef over a 70C delta 4) Your Rb self heats 20 to 30C in still air Here’s some math: You will need at least 10,000 seconds to get a single frequency estimate

If not, you should still be able to estimate the absolute need and /then/ add margin to that. >> Yes, the master will have a fairly low phase noise local oscillator as >> it's internal reference. Everything will synch to that. If all you are >> doing is syncing the local cluster you don't even care about time >> outside.

. === So based on a “bang for the buck” estimate: The rebuild units come out on top The working telecom units come in second The FRK’s come in third The others come in someplace further back than that. === Even simple repairs on theses are far more complex that manually setting an Rb on frequency against GPS.

The crowding of calibration at the high resistance end of the scale should not be an invitation to estimate high resistance either, since the mechanical meter zero becomes a factor.  Pointer 'stiction' can cause errors as well.

Lengths aren't fixed, but give a realistic estimate, and please don't exceed 30 minutes unless you have something special planned (in that case, contact one of us). We will typically go for 30-minute slots -- shorter talks, unless they're really short, usually tend to screw up the schedule too much.

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