[time-nuts] GPS module recommendation for Pi timing

[Jim Harman]

Is this application for a product that you will be selling in quantity and
producing over time, or a one-off or low volume application?

On Fri, Mar 13, 2020 at 10:07 AM Brian Lloyd <brian at lloyd.aero> wrote:

> I have an application where I need to synchronize the internal TOD RTC in a
> raspberry pi and need to pick a GPS module. We are building our own
> hardware but still using the Pi so interconnection will be via GPIO/serial.
> We won't try to use USB.
>
> This is not an NTP application. These units will be in the field and will
> most likely not have Internet access. I need their clocks to be pretty
> close. I am shooting for 1ms ... if possible.
>
> The new M9F and M9T modules from Ublox are a bit pricey. The M8T is a bit
> more reasonable. OTOH I realize there are limits to how tightly I can
> control the Pi's RTC and will run into diminishing returns, so even the M8T
> might be overkill.
>
> Has anyone here figured out what the reasonable limit is for timing on a
> Pi, and what makes sense for a timing module for an application like this?
>
> Thanks.
>
> --
>
>
>
> Brian Lloyd
> 706 Flightline
> Spring Branch, TX 78070
> brian at lloyd.aero
> +1.210.802-8FLY (1.210.802-8359)
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-- 

--Jim Harman