Re: [amsat-bb] Oscar 0

[Cliff Buttschardt <cbuttsch@xxxxxxxxxx>]

Indeed that was an interesting article to start some thinking.
There is a great need for a bit more technical investigation!
     Note that the satellite term ARTEMIS has already been
used by a group of Santa Clara University students.  Three
female engineers have built three additional satellites,
JAK, THELMA and LOUISE collectively called ARTEMIS.  These
made orbit aboard the JAWSAT/OPAL carrier but were never heard
from unfortunately.   Cliff KR

Clifton Herbert wrote:
> 
>  Here's an interesting article that I enjoyed so much that I printed it out, and
> since the subject has sort of came up, here's the URL. Check it out and kick the
> idea around a little. Always interesting to see what others think as well.
> 
> http://www.qrz.com/features/Artemis/page1.html
> 
>  73 Clinton Herbert AB7RG
> 
> Tony Langdon wrote:
> 
> > > I think it is very intriguing to put an amateur transponder
> > > on the moon,
> > > but before we
> > > get started let's do the link margin calculations. The moon
> > > is very very
> > > far away and
> > > most hams will not be able to work a lunar transponder with
> > > an HT and an
> > > arrow
> > > antenna. Only those "elite" hams with big antenna arrays in their
> > > non-covenant
> > > restricted backyards will be able to work a repeater on the moon, and
> > > once it is
> > > deployed there we will no doubt see postings on amsat-bb about how
> > > "Amsat builds satellites for the elite minority and not for
> > > the average
> > > ham."  So lets make sure that
> > > everybody understands this up front.
> >
> > I'd done some rough sums in my head and came to this conclusion.  Has anyone
> > done a reasonably accurate link calculation for a lunar transponder?  And
> > what sort of antennas would we use?  That would no doubt depend on how
> > accurately we can point the things.  Even on the lunar surface, thich
> > "nominally" faces the Earth, there is enough libration to limit the antenna
> > gain that can be used before a tracking antenna is necessary to keep Earth
> > within the beam.
> >
> > > radio operators, and only to an elite group of hams at that. But it
> > > can't hurt to ask.
> >
> > Never hurts to ask. :)
> > >
> > > With the passing of Werner Haas, Amsat has lost more than half of its
> > > linear
> > > transponder design knowledge. Werner designed and built most of the
> > > communications payload for AO-10, AO-13 and Phase 3D. I frankly don't
> > > know
> > > who is going to step forward to fill those shoes. I don't
> > > know of anyone
> >
> > Maybe there's an object lesson here about putting one's eggs in the same
> > basket (or brain, in this case).  Unless technologies used by AMSAT are
> > documented and kept in a safe (but accessible) place, this will happen
> > again, with the associated cost of re-learning the art.
> >
> > ----
> > Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> > To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
> 
> ----
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