[amsat-bb] Re: The Moon is our Future
kd8bxp at aol.com
Thu Jul 2 07:28:39 PDT 2009
Don't want to get a whole new thing started here but - I don't think we ever went to the moon in 1969 and I don't think we will ever goto the moon - in 2012 or whenever they proposed a "return" to the moon
I would love to see an amatuer repeater on the moon thou - from my understanding EME is expensive to do, so I think it would leave most of us out
Where as and bringing things back around - LEOs are realitive low cost to use to the normal everyday day
I will put my two cents in for more LEOs - :-)
Hey are there any geosynchinze amatuer sats up?
From: Robert Bruninga
Sender: amsat-bb-bounces at amsat.org
Cc: 'Jack K.'
Cc: amsat-bb at amsat.org
Cc: kg4zlb at gmail.com
ReplyTo: bruninga at usna.edu
Subject: [amsat-bb] Re: The Moon is our Future
Sent: Jul 2, 2009 10:18 AM
> Why go with the minimal antenna gain?
> ... any antenna with a 3 db point that exceeds
> 6.5 degrees is just wasting transmitter power.
I think that would be about a 24 dB gain antenna. Pretty big
and would take some careful alignment... Kinda like a realy big
> Just remember what an Oscar 10 station took
> to have reliable communications, At Apogee
> it was only 35,000 miles away, the Moon is ...]
> [250,000 miles]
Which is 7 times farther, squared or 50 times more power (about
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.
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