Hello, I am new to the whole precision time-keeping game (and to this mailing list) so I apologize in advance if my question is too naive or has been answered already in your mailing list.
Is it possible to have two separate GPSDOs, each with their own antennas, be phase coherent to each other? I have a Jackson-Labs Fury <https://www.jackson-labs.com/index.php/products/fury> and a Mini-JLT <https://www.jackson-labs.com/index.php/products/fury>. I am using each to provide a 10 MHz reference to two separate software-defined radios (SDRs). In my tests I find that the phase offset between said SDRs has a slow time-varying behavior. I know the frequency errors of the GPSDOs are of the order of parts per trillion which will show up as slow time-varying phase offsets but I was hoping to use the PPS offsets and instantaneous frequency errors that I get from these modules (using SCPI commands) to be able to "back out" or predict what that time-varying phase offset would be. Is such a thing possible? Currently, the time-varying phase change does not seem to follow any discernible pattern and my attempts at backing out the phase change do not match my measurements. Here is the math I am using for calculating what I *think *the phase *should* be: [image: image.png] [image: image.png] [image: image.png] Does any of this seem sensible? Any input is appreciated. TL;DR: Trying to get phase coherence between two separate GPSDOs may not be possible but can you use PPS offsets and frequency errors metadata to correct for it in post? Regards, Krishna
_______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.