Re: Fw: [amsat-bb] Mars? Why not P3x in moon orbit...?

[tlang@xxxxxxxxxxxxxxxxxxxx (Tony Langdon)]

Hello Murray!

01 Sep 01 18:48, you wrote to All:

 >> 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

Trouble is an antenna with this much gain would need to be steerable, to
compensate for the Moon's libration.  A fixed antenna would need a beamwidth of
10 degrees or so, otherwise squint would be a serious problem.

Tony, VK3JED

.. 's short.
--
|Fidonet:  Tony Langdon 3:633/284.18
|Internet: tlang@freeway.apana.org.au
|
| Standard disclaimer: The views of this user are strictly his own.


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