Re: ubxtool -- setting DYNMODEL

[Gary E. Miller]

Yo John!

On Fri, 8 May 2020 16:59:21 -0400
John Ackermann N8UR <address@hidden> wrote:

> On 5/8/20 3:14 PM, Gary E. Miller wrote:
> 
> > Will a few mm either way affect hams?  
> 
> Nah, not really.  But the time-nuts disease spreads to other areas
> like volt-nuts and gps-nuts and precise measurement is just one of
> those things I tend to do.

Yup, an infectious disease.

> As mentioned earlier, there is a definite time-nuts tie in to PPP
> processing to get clock offsets.  However, that doesn't apply to this
> experiment because (a) the F9 receivers don't accept external
> reference input, and (b) for timing you never want to mix GPS and
> GLONASS.

Sadly, the clock offset is less than the clock granularity if any known
linux hardware.  There has been work on kernel drivers to echo the PPS
pulse to an M8T or M9T, capture the interrupt latency, then apply a
cirrection factor to the NTP idea of system time.  Only a few have dared
venture there so far.  Eventually it is the way forward.




RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        address@hidden  Tel:+1 541 382 8588

            Veritas liberabit vos. -- Quid est veritas?
    "If you can't measure it, you can't improve it." - Lord Kelvin

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