[time-nuts] SA22.c and Lady Heather

Mark Sims holrum at hotmail.com
Sat Sep 2 09:55:21 EDT 2017

The data that RDR showed was from the SA22.c "w" command.  I think he was just using a terminal program.

Attached is a screen dump of Heather doing a software disciplining algorithm on a SA22.c (using the dev board as an interface).  The 1PPS reference that I am using is the nosiest one that I had handy (LEA 5T, indoor antenna,  second 1PPS output... it has over +/- 66 ns of jitter).

Heather can also calibrate the SA22 / X72 frequency output.  You apply a 1PPS input,  enter &a and a sample count (default 1800 seconds).  It then calculates the drift rate from a linear regression trend line and sets the device DDS tuning word.  The resolution of the DDS in the device is around 2.5E-12 / count.
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