[time-nuts] SA22.c and Lady Heather
Mark Sims
holrum at hotmail.com
Sat Sep 2 13:55:21 UTC 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.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: sa22.gif
Type: image/gif
Size: 41068 bytes
Desc: sa22.gif
URL: <http://febo.com/pipermail/time-nuts_lists.febo.com/attachments/20170902/428b1eeb/attachment.gif>
More information about the Time-nuts_lists.febo.com
mailing list