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Re: Re:Re: Info about OSCAR on Moon surface



I have a question. What added cost/benefit would be get from putting a
transponder on the moon?

My answer: A huge cost with decreased benefits in comparison to orbiting
satellites.


----- Original Message -----
From: "William Leijenaar" <pe1rah@hotmail.com>
To: <amsat-bb@AMSAT.Org>
Sent: Tuesday, May 07, 2002 5:04 PM
Subject: [amsat-bb] Re:Re: Info about OSCAR on Moon surface


> Hi AMSATs,
>
> Thank you for the information on my questions.
> The moon surface is not a very nice enviorment as I read the data, but I
> think it is not impossible to make an transponder that survives it.
>
> 1. The temperatures are between -200C in the shade and +200C in sunlight.
>
> - My idea: Make some kind of movable sunlight shielding, so the OSCAR can
> shield protect it self when overheated. When it cools down to much in the
> shade, then the OSCAR can move away the shielding.
> - Or make some kind of "sun-glasses" principle, that blocks most of the
> sunlight, but not all.
>
> 2. About getting the OSCAR on the surface, I have not many knowledge in
this
> area. Maybe the OSCAR can be put into some inflatable bal, and bounce on
the
> moon surface. Like the "Path-finder" on mars did...
>
> 3. There is some el/az of the moon.
>
> - There are many ways to have some az/el changings. On SHF an dish can be
> used with an movable feed. Or use several antennas and change HF beam by
use
> of phase shiftings. On SHF this can be done at small size, but it take
high
> technology.
>
> 4. Light/Dark periods take 2 weeks each.
>
> - The light period can be survived by some kind of sun shielding.
> - The dark period is more a problem. Batteries will not survive long, so
the
> only option is a station working on solar cells, and at the dark period it
> has to go into some kind of "winter sleep"
> I don't know it transistors survive -200C, but I have seen some
transistors
> with storage temp. till -150C
> When transistors with storage temps. till -200C are available, it must be

> possible to construct an transponder with it.
>
> - When transistor are absolute not possible, then why not make it in tube
> technology ?? I do not mean only with commercial tubes, but tube
TECHNOLOGY
> in general. Transistors can not be made by amateurs, but tubes can be made
> by amateurs for this special purpose :-)
>
> PS: This is also the reason why I asked if there are high voltage solar
> panels available. The only problem then is if they can survive the -200C
>
> Tell me if you have some more ideas, or just what you think of it :-)
>
> The easy things people always like to do, its are the difficult things
that
> make people think and find out new technology :-)
>
> 73 de PE1RAH, William
> ---
>
>
>
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