[time-nuts] Meaning of GPSCon "Graph" terms

Azelio Boriani azelio.boriani at screen.it
Thu Apr 4 12:33:03 UTC 2013


Anyway, here http://www.realhamradio.com/gpscon-info.htm you should find
your answers.

On Thu, Apr 4, 2013 at 2:30 PM, Azelio Boriani <azelio.boriani at screen.it>wrote:

> Since the GPSCon software is not free, I suppose it must have a complete
> documentation and full support from the vendor.
>
>
> On Thu, Apr 4, 2013 at 2:01 PM, James Robbins <jsrobbins at earthlink.net>wrote:
>
>> I'm using GPSCon software on my Fury but I'm not clear as to the meaning
>> of some of the terms which populate the "Graph" display?
>>
>> 1.  At the top "EFC" graph (red), what do "ad=0m" and "sd=0m" mean?  Is
>> "ad" Allan Deviation?  How do these numbers relate to the usual frequency
>> scales we see of so many parts per billion or whatever?  Deviations from
>> what?
>>
>> 2.  At the lower "TI" graph (blue), what do "av=-0.12n" and  "sd=1.4n"
>> mean?  I assume they are nanosecond averages, but are they averages over
>> the entire reading period and what do they signify?
>>
>> 3.  The green scale numbers in the EFC graph show "432us", "6.5us" and
>> "100ns".  What do these numbers mean?
>>
>> 4.  The "TI" scale shows "4.3ns to -3.1ns".  From what baseline are these
>> the maximum excursions?
>>
>> 5.  What is the meaning of "LPF -0.2ns"?
>>
>> 6.  Does the slope (up or down) of the gold line in the EFC section
>> (general trend) indicate something?
>>
>> 7.  The "TI to GPS" box seems to show a time interval (e.g. 7.2E-10).  Is
>> this an instantaneous reading or an average?  What is being compared to
>> what?
>>
>> 8.  What does the "3.1e-005" along the left side of the EFC graph mean?
>>
>> 9.  Does this software provide Allan Deviation results?
>>
>> Many thanks for the explanations.
>>
>> Jim Robbins
>> N1JR
>>
>>
>>
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>
>



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