[time-nuts] SA22.c and Lady Heather

Dave Mallery dave.mallery at gmail.com
Fri Sep 8 18:11:00 EDT 2017


hi

i got through the smoke to a machine shop today and should have an estimate
for eight SA22.c sinks shortly.

dave

On Sat, Sep 2, 2017 at 2:48 PM, Dave Mallery <dave.mallery at gmail.com> wrote:

> 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.
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>
>
>
> --
> Dave Mallery, K5EN                 (ubuntu linux 16-10)
> PO Box 15                              Ophir,  OR  97464
>
>       linux counter #64628 (since 1997)
>
>
>
>


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

      linux counter #64628 (since 1997)


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