[time-nuts] Re: Comparison/evaluation of u-blox timing receivers

[John Ackermann]

Hi Andrew --

Yes, it's entirely possible the problem was with the setup.  I doubt it was signal level (I was feeding clean 3.3V TTL PPS signals) but I'm not sure that my data capture software was as robust as it could have been.

John

On Aug 25, 2021, 5:16 PM, at 5:16 PM, Andrew Rodland <andrew at cleverdomain.org> wrote:
>Very interesting.
>
>When I built my Arduino Due-based Rb clock (currently disassembled)
>around
>a NEO-M8T (more specifically, an EVK-M8T), I used the EXTINT to measure
>the
>difference between my onboard PPS and the GPS top-of-second. I ran it
>pretty long term without seeing any lost or duplicated TIM-TP messages.
>Is
>it possible that you had some mundane issues with drive levels or
>coupling,
>there?
>
>Andrew KC2G
>
>On Mon, Aug 23, 2021, 9:52 PM John Ackermann N8UR <jra at febo.com> wrote:
>
>> In 2020 I did an extensive evaluation of the timing ability of the
>> u-blox LEA-M8F, NEO-M8N, NEO-M8T, NEO-M9N, ZED-F9P, and ZED-F9T.  The
>> work was made possible by support from the HamSci consortium
>> (https://hamsci.org) under NSF grants supporting HamSci activities.
>>
>> I was sure I'd posted about the paper on time-nuts, but I can't find
>any
>> record that I did, so this is a belated announcement.  It's available
>> for download from
>>
>>
>>
>https://hamsci.org/sites/default/files/publications/2020_TAPR_DCC/N8UR_GPS_Evaluation_August2020.pdf
>>
>> As BobC says, "Lots of fun!"
>>
>> John
>>
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