[amsat-bb] P5 Moon station idea's

["William Leijenaar" <pe1rah@xxxxxxxxxxx>]

Hi AMSATs,

First of all I want to clear some mistake of me.
Frank Sperber he correct me that an Moon station is also of an P5 catogory. 
In my messages I wrote P4 as an Moon mission but it was my mistake... sry

Then I read the article of G3RUH about an moon relay.
Snip:

>An example, 1 watt transmitted from a 20 dbi gain dish on the Moon,
>received on a 1.2m dish at Earth with a system noise temperature of
>100K results in a signal to noise ratio in 2.4 kHz bandwidth of 10.5
>db.(Note that frequency matters not). This would support one rather
>noisy SSB voice signal. Alternatively it would carry an error-free 2400 bps 
>binary PSK data transmission without coding, 9600 bps with modest coding 
>[2].

So what would 100W on the moon do ?

Then I see again many questions an discussions about the antenna steering 
problems. Most amateurs think about a huge dish on the moon with complex 
steering systems.

What about phase array antennas ? With these antennas the RF beam can be 
changed in direction without mechanically move the antenna.
Another idea is to focus an parabolic dish towards the center position of 
the earth and correct the beam by changing the feed in front of the dish. 
Such an system is also been used by the pioneer to locate the earth. Then 
there are many many more options to solve the problem of the <10 degree 
position changing, we only have to start looking for them.

There are many agruments for not making an P5 moon station, but none of them 
are strong enough for me to think it is impossible for amateurs.
I even more believe it is possible...

(Not possible as a dream, but possible in [amateur]technical view)

73 de PE1RAH, William
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