The first unit I built with the ECOC-2522 did not work very well. The low-tau ADEV was above 10^-11, but it's supposed to be down in the low -12s. I found a lot of noise on the reference voltage output line. I'm not sure what's going on there.

I built a second one with the same circuit that I use for the OH300. For that one, the resulting ADEV is much better - in the mid -12s. It's not as good as ECS' test data says it should be, but it's possible that either my test set up or the circuit is contributing enough noise to take the result from the low to the mid -12s.

It's somewhat concerning that the reference output from this oscillator seems to have too much noise to use. Of course, the sample size is 1, so it may just be that I got a dud.

In the end, however, the ECS isn't so much better than the Connor Winfield unit that I'm going to switch to it. And while the ADEV curve is slightly better at tau 2-10 seconds or so, I'm not convinced it's better enough to justify the extra cost.