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RE: Longevity-sat proposal



The magnetic field at 10000 km is pretty weak but with a large
enough magnet and if you waited long enough, especially if
there was some way you could be put into "almost the right"
orientation to begin with, you would align your spin axis
with the mag poles.

What would you do with that?

This would mean those faces on the satellite that a
vector from the ground to the satellite would strike would
always be in motion.  The spin axis would not be parallel to
the spin axis of the earth but close enough so that you could
not point a high gain antenna at the earth without a really
complex de-spinning mechanism.  The antenna would have to
be up on the spinning boom and be "despun".  This has been
done by Hughes and other satellite builders and it is complicated
beyond all belief.  Think about getting S and L and UHF signals
through a spinning ring without being wasted away in losses.


Keep thinking, you might come up with a novel idea by not having
been trained (or beaten) into conventional thinking.

Bob
N4HY



-----Original Message-----
From: owner-AMSAT-BB@AMSAT.Org [mailto:owner-AMSAT-BB@AMSAT.Org]On
Behalf Of Howie DeFelice
Sent: Friday, November 07, 2003 5:00 AM
To: amsat-bb@AMSAT.Org
Subject: Re: [amsat-bb] Longevity-sat proposal


I'm definitely no rocket scientist but what if the satellite WAS in a high
circular orbit over the equator and had two booms with permanent magnets
oriented to align the craft with the poles. Worst case, would it just spin
on the north-south "axle" ? Is there enough magnetic field at medium earth
orbit for this to work? If this is totally ridiculous please exercise your
delete key : )

Howie AB2S

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