Jim
This is still measuring it with a micrometer, marking it with a piece of
chalk and cutting it with an ax.
73
Bill
W7VP
----- Original Message -----
From: "Jim Lux" <jimlux@earthlink.net>
To: <TexasRF@aol.com>; <towertalk@contesting.com>
Sent: Monday, September 18, 2006 8:52 AM
Subject: Re: [TowerTalk] And now for something completely different
(TrueNorth)
At 08:33 AM 9/18/2006, Jim Lux wrote:
>At 07:52 AM 9/18/2006, TexasRF@aol.com wrote:
> >
> >Here is a golden opportunity for a talented computer programmer! If
> >Polaris
> >makes the rotation as described then it passes right through true
> >north twice
> >per rotation. The needed software will tell us just when this happens and
> >we
> >can run outside to complete our exact antenna azimuth calibration.
>
>
> >
> >Who will cash in on this first? I can't wait for my copy of the program!
> >
You've already paid for it...
http://aa.usno.navy.mil/data/docs/topocentric.html
Select PositionType: Apparent Topocentric Zenith Distance and Azimuth
Celestial Body of Interest: Polaris
Fill in the rest as appropriate, and it generates
a nifty little table like this one:
Date Time Zenith Azimuth
(UT1) Distance (E of N)
h m s ° ' " ° ' "
2006 Sep 18 15:46:00.0 55 49 03.8 359 10 23.9
2006 Sep 18 15:47:00.0 55 49 14.6 359 10 20.5
2006 Sep 18 15:48:00.0 55 49 25.4 359 10 17.2
2006 Sep 18 15:49:00.0 55 49 36.3 359 10 13.9
2006 Sep 18 15:50:00.0 55 49 47.1 359 10 10.7
2006 Sep 18 15:51:00.0 55 49 57.9 359 10 07.6
2006 Sep 18 15:52:00.0 55 50 08.8 359 10 04.5
2006 Sep 18 15:53:00.0 55 50 19.7 359 10 01.4
2006 Sep 18 15:54:00.0 55 50 30.6 359 09 58.4
2006 Sep 18 15:55:00.0 55 50 41.5 359 09 55.5
2006 Sep 18 15:56:00.0 55 50 52.4 359 09 52.6
2006 Sep 18 15:57:00.0 55 51 03.3 359 09 49.8
2006 Sep 18 15:58:00.0 55 51 14.2 359 09 47.1
2006 Sep 18 15:59:00.0 55 51 25.1 359 09 44.4
2006 Sep 18 16:00:00.0 55 51 36.1 359 09 41.7
---
Now.. figuring out how to sit up on top of the
tower, holding your laptop, a WWV receiver, and
the wrenches needed to tighten the clamp holding
your owl while carefully sighting along the boom of your antenna is up to
you.
Anyway.. this has gotten a lot easier in the last
20-30 years. 20-30 years ago, you'd have been
looking things up in almanacs, doing lots of trig calculations, etc.
> >73,
> >Gerald K5GW
> >
>
>
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