On Sun, 16 Aug 2015 23:27:43 +0200 Attila Kinali <[email protected]> wrote:
> > I've been saying out loud that the oscillator is ±1 ppb from GPS over the > > 1000 second window. I know of Allan variance, but I don't have anything else > > handy I can use for comparison. I also can't really afford to send one off > > for testing to a proper lab. > > With not having any other reference, you can use the EFC voltage > and its relation to frequency as a guestimator for the ADEV. But > be aware that the EFC is not 100% linear and the instability of your > voltage reference etc pp affects this value as well. There was some > discussion about this technique a couple of years ago (IIRC 2008) > on this mailinglist. But i cannot find at the moment... it had some > weird name too... Maybe someone with a better long term memory can > chip in on that. Found it. It is called "tight pll" or "tpll", you can find a summary here: http://www.ke5fx.com/tpll.htm Attila Kinali -- I must not become metastable. Metastability is the mind-killer. Metastability is the little-death that brings total obliteration. I will face my metastability. I will permit it to pass over me and through me. And when it has gone past I will turn the inner eye to see its path. Where the metastability has gone there will be nothing. Only I will remain. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
