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# RE: Moon as an alignment reference

```Yup, in Atlanta, it's almost non-existent.  Actually, it's 2W.  Already did
that, just didn't get it right when eyeballing it! :-(

Oh, well, it's on a crankup/tiltover, easy to fix!

Alan

-----Original Message-----
From: Bob Nielsen [mailto:nielsen@oz.net]
Sent: Thursday, August 10, 2000 9:35 PM
To: Alan K. Adamson
Cc: amsat-bb@amsat.org
Subject: Re: [amsat-bb] Moon as an alignment reference

This is just a wild guess, but have you taken into account the
difference between magnetic and true north?

On Thu, Aug 10, 2000 at 08:54:40PM -0400, Alan K. Adamson wrote:
> Well, it this is all true,  I failed.... I figured, I found the trick on
> alignment with a compass... Get one with a mirror and a line on the mirror
> and point the antennas at a certain heading, set the compass, flipdown the
> mirror, align the line with the boom and read the heading.....Well, I was
4
> degrees off!!! I guess not bad, but using the moon, if I adjust 4 degrees
> clockwise I find the moon everytime.
>
> Thanks, didn't know if refraction would effect this effort.  It's pretty
> easy to align the moon with the boom.  Point, walk back and check.  You'll
> be surprised at how much 1 degree is!
>
> Thanks,
> Alan
>
> -----Original Message-----
> From: Franklin Antonio [mailto:antonio@qualcomm.com]
> Sent: Thursday, August 10, 2000 8:20 PM
> To: ne1h@ne1h.dyndns.org
> Cc: amsat-bb@amsat.org
> Subject: Re: [amsat-bb] Moon as an alignment reference
>
>
> At 07:42 PM 8/10/00 -0400, Alan K. Adamson wrote:
> >Can you use the moon as an alignment reference?  I've notice that what
> >appears to be correct on a compass is about 4 degrees short when pointing
> at
> >the moon.  I'm only checking Azimuth, but will it work for both Az and
El?
>
> Absolutely!  Highly recommended.  Sun and moon both make excellent antenna
> alignment references.  (Same can be said about many thousands of other
> celestial bodies, but the typical person can only identify the two big
ones
> reliably.)
>
> An accurate bearing is very difficult to get from a compass.  Most people
> fail this test.  They are sensitive to too much stuff in our everyday
> environment when you are near your home.  Iron gas pipes in your walls,
> your antenna tower, your car, etc etc.
>

--
Bob Nielsen, N7XY                          nielsen@oz.net
Bainbridge Island, WA                      http://www.oz.net/~nielsen

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