[Date Prev][Date Next][Thread Prev][Thread Next] - [Date Index][Thread Index][Author Index]

Re: 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
 
----
Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org



AMSAT Top AMSAT Home