[time-nuts] GPS Antennas

[Hal Murray]

kb8tq at n1k.org said:
> The gotcha with putting anything on top of a GPS antenna is that it impacts
> the phase  shift from the sat’s. How important that is gets quickly into just
> how picky you happen to be. 

How picky do I have to be before that is significant?  How geeky would I have 
to be to measure it?

Would a hemispherical cover provide equal delays at all elevations?  I think 
the solidly mounted USGS fault/volcano monitoring setups have a round top.
  https://www.usgs.gov/media/images/gps-tracks-ground-deformation

Do any antenna manufacturers advertise uniform phase delay?
Do any software vendors advertise that their software works better with 
specific antennas?



-- 
These are my opinions.  I hate spam.