[amsat-bb] Re: The Moon is our Future
bruninga at usna.edu
Thu Jul 2 09:04:45 PDT 2009
> But doesn't it have to be above ground?
> Yes the moon is dry and probably the
> poorest conducting dirt there is, But
> just like on Earth it can't be laying
> on the ground yes?
Even if the ground was a perfect reflector and conductor, then
the antenna would only have to be 19" above the ground at 2
meters. Next consider that the moon is rock and extremely
dry... And rock has about 1/1000 the conductivity of moist
soil... So where the "true" reflection in the ground of the
moon is surely many feet down. So sitting it on the ground" of
the moon is probably 99% as effective as trying to hang it 19"
> Robert Bruninga wrote:
> BUT one easy way to get gain is to use just a long
> cable. I think it takes about 22 feet of coaxial dipole
> elements at 2 meters to give about 6 dB of gain. So
> 6 dB gain segments on the rock of the moon is as easy as
> unrolling a spool of cable. Unrolling 8 of these with
> spacing could yield about 17 dB.
> Of course this woiuld only point straight up, so it
> to be on a moon base in the middle of the earth facing
> But since there is a lot of interest in moon bases near
> poles where there might be water, then a similar array
> down coaxial cable arrays could be phased horizontally
> at earth. Actually, just about any direction can be
> with the right spacing.
> ONLY problem of course is there has to be someone with
> roll out the cables.
> Just a thought.
> Bob, WB4APR
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