[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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