[hpsdr] Fwd: 1, 2, 3, 4, 5, 6, 7....

[Glenn Thomas]

Yes... very strange. I'd expect to see some mm of change due to daily 
thermal expansion in the antenna support, changing tidal stresses on the 
land and changes in the index of refraction along the path(s) to the GPS 
satellite. Among other things. These will affect any GPS receiver.

Unless... perhaps both receivers are fed from the same antenna and the 
reported difference is between the two receivers rather than changes in 
the indicated position/altitude?

73 de Glenn

On 7/27/2012 7:57 AM, Alberto I2PHD wrote:
>
> On 7/27/2012 1:16 PM, Simon HB9DRV wrote:
>> Since yesterday afternoon position and altitude rock-solid, not even a mm
>> difference.
> That's strange, not for the position but for the altitude... unless 
> you happen to live in a very
> fortunate spot of earth surface, the reported altitude should change 
> depending on how many and
> which satellites are in view....  not only my Thunderbolt, but also 
> the GPS of my smartphone
> exhibits variations in function of the time of the day.
>
> -- 
> /*73 Alberto I2PHD*/




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