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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