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Fw: Mars? Why not P3x in moon orbit...?




----- Original Message -----
From: "Murray Peterson VK2KGM" <vk2kgm@ihug.com.au>
To: "Jens H. Jensen" <topcat@mail1.stofanet.dk>
Sent: Saturday, September 01, 2001 6:48 PM
Subject: Re: [amsat-bb] Mars? Why not P3x in moon orbit...?


> My two cents worth on this is that the optimum repeater on the Moon's
> surface would have an antenna gain such that its 3db beamwith would just
> cover the Earth's diameter. I quick guess would be about 54db gain! This
> would put the path loss the "earth stations" need to provide for as about
> 160db which is not that difficult. Considerably better (about 100db
better)
> than moon bounce.
>
> Regards,
> Murray Peterson
> VK2KGM
>
> ----- Original Message -----
> From: "Jens H. Jensen" <topcat@mail1.stofanet.dk>
> To: <amsat-bb@AMSAT.Org>
> Sent: Saturday, September 01, 2001 11:39 AM
> Subject: Re: [amsat-bb] Mars? Why not P3x in moon orbit...?
>
>
> > At 00:55 01-09-2001, you wrote:
> > >  I don't know about the path losses
> > >but I think this will be not an huge problem when use
> > >high gain antenna's. When using only an 23cm/13cm
> > >transponder then the satellite and antennas can be
> > >small. The satellite would be light and only an little
> > >engine would be needed.
> >
> > Isn't the pathloss 6dB for every doubling/halving of distance?
> > That would then be 18dB weaker at 400.000Km than at 50.000Km, or ????
> > Eight times the dishsize, all other things being equal.
> >
> > Somewhat large....
> >
> > 73 de OZ1LRG
> >
> > ----
> > 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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