[time-nuts] LEA-6T TCXO measurements

Gabs Ricalde gsricalde at gmail.com
Wed Apr 25 20:56:07 EDT 2018


The NAV-TIMEUTC message of the u-blox LEA-6T has a fractional seconds
field, which is the receiver clock offset estimate and can be used to
measure the internal TCXO. Attached are the ADEV and frequency
difference plots (blue traces). For comparison, I also have PPS logs
from a TL-WR703N NTP server (pink traces) with ntpd stopped.

I'm wondering why the LEA-6T has that kind of frequency jumps.
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