> 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?
Good question... 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" up. > Robert Bruninga wrote: > > > BUT one easy way to get gain is to use just a long coaxial gain > cable. I think it takes about 22 feet of coaxial dipole > elements at 2 meters to give about 6 dB of gain. So laying down > 6 dB gain segments on the rock of the moon is as easy as > unrolling a spool of cable. Unrolling 8 of these with the right > spacing could yield about 17 dB. > > Of course this woiuld only point straight up, so it would need > to be on a moon base in the middle of the earth facing side. > But since there is a lot of interest in moon bases near the > poles where there might be water, then a similar array of layed > down coaxial cable arrays could be phased horizontally to point > at earth. Actually, just about any direction can be obtained > with the right spacing. > > ONLY problem of course is there has to be someone with legs to > roll out the cables. > > Just a thought. > Bob, WB4APR > > > ________________________________ > > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.5.375 / Virus Database: 270.13.2/2214 - > Release Date: 07/02/09 05:54:00 > > > > _______________________________________________ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
