The LEA-6T is a good receiver, but it does have a sawtooth bug. From time to
time, when the sawtooth is approximately 10,299 (or is it 10,399?) ps, the sign
of the sawtooth is wrong. It's an easy fix: Just check whether the sawtooth
makes "this" corrected measurement worse than the previous corrected
measurement. I haven't checked the LEA-M8T for the bug, as I turned off the
notice message when I corrected it.
Bob -----------------------------------------------------------------
AE6RV.com
GFS GPSDO list:
groups.yahoo.com/neo/groups/GFS-GPSDOs/info
From: Mark Sims <[email protected]>
To: "[email protected]" <[email protected]>
Sent: Monday, July 18, 2016 10:28 PM
Subject: [time-nuts] How does sawtooth compensation work?
Or use the sawtooth compensation value to control an external variable delay
line circuit to move around the PPS signal from the receiver. This can get
interesting to implement if the receiver can output negative values for the
sawtooth compensation (hint: add a bias to the sawtooth value to make the
compensation values always positive and adjust the antenna cable delay command
to remove the bias value that you add. Oh, and for some receivers you have to
reverse the meaning of positive and negative sawtooth corrections and/or cable
delay values). It is even more interesting if the receiver outputs the
sawtooth correction after the pulse it just generated... hint: get a different
GPS receiver).
--------------------
> A device that uses the sawtooth data shoves it into the control loop along
> with the measured early / late information on the PPS.
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