[time-nuts] GPS Antenna
azelio.boriani at screen.it
Mon Sep 12 20:31:47 UTC 2011
Yes, if you are at 55 degrees (N or S) you have satellites at most straight
on your head and I think you must start facing just south, say, at 70
degrees and beyond. I'm in Italy at 45 degrees north (JN55BK QTH locator) so
no such a problem.
73's de IW2DMO
On Mon, Sep 12, 2011 at 8:29 PM, Chris Albertson
<albertson.chris at gmail.com>wrote:
> On Mon, Sep 12, 2011 at 11:13 AM, David J Taylor
> <david-taylor at blueyonder.co.uk> wrote:
> >> South? Are you sure? GPS SVs aren't TV broadcast satellites...
> > Particularly if you are at a more northerly latitude, if you need to
> > one aspect or the other, the southern aspect may provide better coverage.
> I assumed the OP lived in the Northern Hemisphere and above about 30
> degrees latitude. If I assumed correctly South is the direction to
> face. The GPS sats are in a (from memory) 60 degree inclined orbit
> so the North sky is not as well covered. The higher North you are the
> more you want to face south. If you are above 60 degrees no sats will
> be north of you. Even in the Southern USA you find there are no sats
> that go to near the north horizon but to the South they remain visible
> until blocked by the horizon. A mirror image of this applies in the
> So. Hemisphere.
> Maybe a better way to visualize this is to think that the Earth is
> covered with a huge shell from 60 deg. S. to 60 deg. N. with large
> "holes" over both poles. Given a choice of only one place to look
> don't aim the antenna at a hole.
> Chris Albertson
> Redondo Beach, California
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