[time-nuts] GPS antenna with direction orientation?

Brooke Clarke brooke at pacific.net
Mon Apr 4 03:32:13 UTC 2011


Hi John:

Exactly.  There are about a dozen specific antennas that have been 
thoroughly characterized for phase center at L1 and L2.  I think to the 
mm level.

Have Fun,

Brooke Clarke
http://www.PRC68.com


John Ackermann N8UR wrote:
> A couple of years ago I picked up a surplus Aeroantenna choke-ring GPS 
> antenna that I think was intended for surveying use.  I finally got it 
> installed today and noticed that it has an arrow on the bottom 
> indicating that the antenna should be oriented with the arrow facing 
> north.
>
> I'm trying to figure out why an omnidirectional antenna should care 
> about which way it is oriented.  The best I can figure is that perhaps 
> it is for repeatability in surveying, so that any minor offset in the 
> phase center would remain consistent when moving the antenna from site 
> to site.
>
> Does anyone have a better answer?
>
> John
>
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