Step in Phase with precisely calibrated unit(s)

[mungewell]

Unexplained step in the phase monitoring with precisely calibrated, maybe this was always there but only visible now we have very low drift...

3 units monitored at same time, fed by single UltraSync One. 30fps.

Similar location, but NOT exactly. X-axis is the RX timecode (ie unit's sync'ed)

[mungewell]

Here's the time stamps for the first drop into the '-0.01' region.

$ cut -d " " -f 3,4 ttyACM1/2024-10-26_10\:06\:08 | grep -m 1 "\-0.01" -
13:49:20:00 -0.01166333
$ cut -d " " -f 3,4 ttyACM2/2024-10-26_10\:06\:08 | grep -m 1 "\-0.01" -
13:51:01:02 -0.01238333
$ cut -d " " -f 3,4 ttyACM3/2024-10-26_10\:06\:08 | grep -m 1 "\-0.01" -
13:42:28:03 -0.01244333

Maybe something related to how the system reads the incoming LTC, it's a digital process... Though should stress this is a
very small step.

[mungewell]

Well this plot of a (calibrated, but stock XTAL) unit seems to show that it's repeatable, and something to do with the zero crossing point.... again it's a tiny step, so perhaps it's not important.