[amsat-bb] Re: How to calibrate the azimuth angle?
vk3jed at gmail.com
Thu Dec 27 22:26:04 PST 2007
At 04:11 PM 12/28/2007, Bruce Bostwick wrote:
>Not meaning to trash compasses, just have had some less than
>satisfying experiences using them to align antennas on satellites due
>to the number of sources of measurement errors that have to be
>accounted for. I've used some very good compasses (my favorites are
>the ones from Morin that allow sighting across the compass to get a
>magnetic bearing of a landmark on the horizon :) but getting accurate
>true north out of even a good magnetic compass is a lot of work ..
Well, I rely on magnetic compasses not to get lost, and use maps that
are most often aligned to grid North. I have managed accuracy far
better than that to aim most antennas (maybe a high gain 10 GHz dish
might have issues, but anything else I could get it near
enough). Mind you, there were a LOT of other good suggestions here as well.
Like any tool, it comes down to practice in using it. Avoiding
magnetic interference to compasses is akin to avoiding QRM when
trying to work weak signals. :)
73 de VK3JED
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