[time-nuts] TruePosition GPSDO Holdover Issues

Artek Manuals Manuals at ArtekManuals.com
Sun May 13 10:57:44 EDT 2018


Nigel
As I recall there is more to it than just the number of satellites. 
involved. Also factored in to all the math is the signal strength of the 
sats plus there relative angles to your spot on the earth. If all three 
are directly overhead the solution is not that accurate compared to if 
they were all at 45 degree elevation at widely divergent compass points 
gives a much more accurate solution . Likely the math / firmware has a 
quality factor built in depending on all the above factors not just the 
number of sats

My memory on this may be faulty  (the older I get the more bytes that 
seem to get dropped) And if it is faulty I am sure others will be more 
than happy to correct me

-DC
manuals at artekmanuals.com

On 5/13/2018 10:27 AM, gandalfg8--- via time-nuts wrote:
> Ok, I give up....
>
>   I've been logging this with Lady H and was watching again this afternoon as the sat count dropped but this time there was no dropping into holdover as the number of sats dropped from four to three....damn, it just carried on doing its thing until the count went up again:-)
>
> I'm still seeing the occasional reported random holdover event but am still no nearer to knowing why.
>
> Otherwise it's a nice unit and does handle the holdover well, even a longer event yesterday whilst there was a supposed antenna fault didn't reflect into the frequency plots, but time to call a halt for now.
>
> Nigel, GM8PZR
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-- 
Dave
Manuals at ArtekManuals.com
www.ArtekManuals.com


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