[time-nuts] SA22.c and Lady Heather

Dave Mallery dave.mallery at gmail.com
Sat Sep 2 17:48:38 EDT 2017


hi

on the 2011 or newer items, they include this link calibration data plot.
<http://www.rdrelectronics.com/skip/feb/EC0329.gif>

i received a printed one with the unit.

dave

On Sat, Sep 2, 2017 at 6:55 AM, Mark Sims <holrum at hotmail.com> wrote:

> 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.
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/
> mailman/listinfo/time-nuts
> and follow the instructions there.
>



-- 
Dave Mallery, K5EN                 (ubuntu linux 16-10)
PO Box 15                              Ophir,  OR  97464

      linux counter #64628 (since 1997)


More information about the time-nuts mailing list