[time-nuts] GPS antenna with direction orientation?

[Graham / KE9H]

John:

Maybe it is not omni-directional.

Since the satellites don't go further north than about 55 degrees, then
(as long as you are in the northern hemisphere) you could reject both
reflections and also any direct signal low on the northern horizon.

--- Graham

==

On 4/3/2011 7:42 PM, 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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