On 10/26/2012 1:06 AM, Bob K6UJ wrote:
Rick,
In the northern hemisphere we can locate the north star for true north.
That's about one degree off if you are looking for precision.
My low power alignment scope has a circle of parallel lines. If the
scope is aligned correctly Polaris will travel around "in the race track"
73
Roger (K8RI)
Thats how I located true north at my qth.
You cant see the north star in the southern hemisphere but I understand you can
see the southern cross which is true south.
You might google how to find south from the southern cross and see if it would
work for you.
Bob
K6UJ
On Oct 25, 2012, at 9:12 PM, Rick Kiessig wrote:
Thanks for the replies so far -- as I said in my OP, I know how to find true
north. I already went through the compass/declination/rough-alignment when I
first put the antenna up. I know about the shadow technique as well [FWIW,
in the southern hemisphere the sun is in the north and shadows point due
south at solar noon]. What I'd like to do now is calibrate pointing
direction with some degree of accuracy, based on something more concrete
than just eyeballing it.
Also, I realize a 3-el Yagi has a reasonably wide 3 dB forward lobe (appx 66
deg). I'm not concerned with the accuracy of where I'm pointing the center
of the lobe; I'm ultimately interested in managing placement of its edges,
where gain drops off quickly.
73, Rick ZL2HAM
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