Re: GPS/PPM very large offset

[Håkan T Johansson]

Hi B&A,

perhaps I missed - which version of the Uputronics module are you using?

One of the new ones as available here:

https://store.uputronics.com/index.php?route=product/category&path=60_64

or one of these older:

https://www.satsignal.eu/ntp/HAB-GPSPI+-ASSY-4-432x288.jpg

https://ava.upuaut.net/wp-content/uploads/2018/11/IMG_0235-500x500.jpg

Best regards,
Håkan



On Sun, 8 Nov 2020, B&A Consultants wrote:

> Hi Mike,
>
> On 07/11/2020 00:03, Mike Simpson wrote:
> > Hi B&A and Gary.
> >
> > It’s glonass
> > They run such a big offset that they are unusable for time.
> >
> > ubxtool -d GLONASS
>
> Spot on ! Since we cannot shoot the Glonnasses from the skies, deactivating 
> them on the GPS did the job. Thanks for the tip.
>
> We did a few tests, with cgps running. When we reactivate using Glonass, the 
> time offset climbs to around 5-6 seconds. And gets back to 0.5 secs when we 
> deactivate Glonass.
>
> > Need to do this every time after Pi reboot or presumably cold restart of 
> > the GPS.
>
> Yep, included in our boot scripts.
> --
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