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Re: Ant. Alignment and the Moon

Sounds great Bill, I'd appreciat it if you could send the file.  I'll give
it a try in my Instantrack
program....  it would be interesting to see how much difference there is
between Instantrack
and the more accurate keps you spoke of.

Thanks again for the informative reply!


-----Original Message-----
From: William B Magnusson <williamb@netc.net.au>
To: Tony AB2CJ <ab2cj@nais.com>; _AMSAT_list (E-mail) <amsat-bb@AMSAT.Org>
Date: Monday, May 15, 2000 5:43 PM
Subject: Re: [amsat-bb] Ant. Alignment and the Moon

>At 14:33 15-05-00 -0400, Tony AB2CJ wrote:
>>After installing a new M^2 antenna, I checked it's alignment using the
>>and noticed my antennas were off by 10 degrees or so.  I used Instantrak
>>made sure the computer clock was correct for accurate measurments.  My
>>question is, how accurate are the "built-in" keeps in Instantrack and is
>>this the best way to align satellite antennas?
>The Moon tracker in InstantTrack doesn't pretend to be very accurate and
>could easily be 10 degrees or so out. You will need something more accurate
>if you are going to set up by the Moon. There are many good
>astronomy/planetarium programs around that will give you an accurate
>of the Moon's position. I have a copy of MOONKEPS written by P Gerber
>HB9BNI. It is a zip file 36k long and it generates a set of kep elements
>each month of a year which can be used in any amateur radio satellite
>tracking program. These give accurate results. I could post it if you want.
>Why not check your set up using the Sun and the shadow of the beam on the
>ground? IT does a good job of tracking the Sun. There was a thread on this
>BB several months ago which looked at many different ideas for setting up
>antennas. I have 'true-north' marked by pegs in my backyard and I have
>always used the shadow method to set up the antennas. The 70cm beam has
>heaps of gain and it tracks the digisats perfectly.
>Regards, Bill...vk3jt
>Milawa Australia

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