[time-nuts] SA22.c and Lady Heather
Dave Mallery
dave.mallery at gmail.com
Fri Oct 13 19:01:51 UTC 2017
hi
machine shop a flake. retrieving my stuff on monday,
sorry... now what?
73
dave
On Fri, Sep 8, 2017 at 3:11 PM, Dave Mallery <dave.mallery at gmail.com> wrote:
> 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)
>
>
>
>
--
Dave Mallery, K5EN (ubuntu linux 16-10)
PO Box 15 Ophir, OR 97464
linux counter #64628 (since 1997)
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