[time-nuts] How does sawtooth compensation work?

Nick Sayer nsayer at kfu.com
Mon Jul 18 22:47:22 EDT 2016

> On Jul 18, 2016, at 4:20 PM, Bob Camp <kb8tq at n1k.org> wrote:
> On a receiver with sawtooth correction, you have a manufacturer specific message that gives
> you information on the state of the receiver. It is defined as either applying to the next pps
> or to the pps that just came out. There is a field that may give you picosecond resolution 
> (as opposed to accuracy) data on the proper location of the PPS edge. Depending on how
> you evaluate the correction, it can get the jitter down below 1 ns (again, jitter as opposed
> to accuracy). 
> A device that uses the sawtooth data shoves it into the control loop along with the measured 
> early / late information on the PPS. 

Thanks. That’s what I figured. Thanks to you and everyone for confirming that.

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