[time-nuts] Re: GPS Elevation Mask Values.

[Ryan Stoner]

Which antenna did you get? Just wondering, I'm finally moving out of the city and I'll be able to mount something nearly obstruction free!

On Mon, Nov 8, 2021, at 18:51, Dan Kemppainen wrote:
> Hi All,
>
> So after a rather long delay, I've managed to get an ebay import dual 
> band GPS antenna in the air. The antenna has good sky view in almost 360 
> degrees azimuth to just about near the horizon. Running a survey on a 
> GPSDO now (Single band 6T Ublox Based chipset). Also letting Lady 
> Heather run for a while plotting the signal strength 'graph'. (See 
> attached).
>
> Given the attached Signal strength vs. az/el, what would be the 
> recommended elevation mask for GPS units?
>
> Obviously, the birds down near the horizon are sending signal through a 
> lot of atmosphere. The ones over the north pole are probably not doing 
> much either. In the last 24 hours there averages 8 to 11 birds used for 
> navigation, so plenty enough to keep a GPSDO running.
>
> Any rules of thumb, or recommendations for the a 'sweet spot' when there 
> is a good sky view available?
>
> Thanks!
> Dan
>
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>
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> Attachments:
> * SignalStrength.jpg

-- 
Ryan Stoner