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Re: [TowerTalk] Positoners Calibration to True North

To: <towertalk@contesting.com>
Subject: Re: [TowerTalk] Positoners Calibration to True North
From: "AD5VJ Bob" <rtnmi@sbcglobal.net>
Date: Fri, 2 Dec 2005 01:05:49 -0600
List-post: <mailto:towertalk@contesting.com>
This seems like a real good link for study of just the
compass thing you asked about:

http://www.scoutingresources.org.uk/compass_magvar.html



  73 fer nw,
Bob AD5VJ

10X# 37210, FP#-1141, SMIRK#-5177
http://www.n5iet.com/
Code may be taking a back seat for now,
but the pioneering spirit that put the code
there in the first place is out front of it all.




> -----Original Message-----
> From: towertalk-bounces@contesting.com 
> [mailto:towertalk-bounces@contesting.com] On Behalf Of
Jim Lux
> Sent: Thursday, December 01, 2005 10:54 PM
> To: Tom McAlee; towertalk@contesting.com
> Subject: Re: [TowerTalk] Positoners Calibration to True
North
> 
> 
> At 08:15 PM 12/1/2005, Tom McAlee wrote:
> >Since the original question was posted by a VK station,
it might be 
> >worth noting that using Polaris to locate north can
only be 
> done in the 
> >northern hemisphere.  It is not visible below the
equator.
> >
> >Down there you'll need to locate south and flip that
180.  
> But, there 
> >is no "south star" such that the south end of the
earth's 
> axis points 
> >almost directly at it.  But, there is some bizarre
combination of 
> >constellations/stars and drawing lines and following
them 
> >perpendicularly to other stars, etc., that can be used
to locate the 
> >south pole with enough accuracy for antenna work.
> >
> >But, never having been in the southern hemisphere, I
don't know the 
> >details. I'm sure you can find info about it on the web
though.
> >
> >And, by the way, Polaris isn't exactly north; it's
about 1 
> degree off 
> >true north.
> 
> 
> use the SUN.. at local solar noon, the shadow will
either be 
> directly north 
> or directly south.  The trick is figuring out when local

> solar noon is. 
> Fortunately, you probably don't need to know to the
gnat's 
> eyelash second 
> of arc accuracy.
> Noon is when the shadow is shortest, but if you mark
where 
> the shadow is 
> equal lengths, the north south line is exactly halfway
between.
> 
> Jim 
> 
> _______________________________________________
> 
> See: http://www.mscomputer.com  for "Self Supporting
Towers", 
> "Wireless Weather Stations", and lot's more.  Call Toll
Free, 
> 1-800-333-9041 with any questions and ask for Sherman,
W2FLA.
> 
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com 
> http://lists.contesting.com/mailman/listinfo/towertalk
> 


_______________________________________________

See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless Weather 
Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions 
and ask for Sherman, W2FLA.

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