[time-nuts] How does sawtooth compensation work?

Mark Sims holrum at hotmail.com
Mon Jul 18 23:28:29 EDT 2016

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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