[Server-sky] [ExI] Power sats again

[tme at asteroidinitiatives.com]

On July 18, 2013 at 12:13 AM Michael Turner <michael.eugene.turner at gmail.com>
wrote:

> > On July 17, 2013 at 7:14 PM Michael Turner <michael.eugene.turner at gmail.com>
> > wrote:
> >> .... Surely, if it's very efficient sky-to-Earth, it's no
> >> less efficient Earth-to-sky?
> >
>
> On Thu, Jul 18, 2013 at 10:57 AM, tme at asteroidinitiatives.com
> <tme at asteroidinitiatives.com> wrote:
> > I don't think so, for two reasons. One, the problem is not really symmetric.
> [....]
>
> OK, so it's like you have a distorting lens between source and target
> for a beam and you want to place it in the optimal position to reduce
> distortion. That'll be closer to the target.
>
> Beam dispersion and deflections that would be minor in going from the
> top of the atmosphere to the surface would be dramatic when going from
> the surface to the top of the atmosphere -- then out to GEO, tens of
> thousands of miles to turn, say, a 0.5 degree deflection into a wide
> miss of the orbital rectenna. Am I looking at the problem the right
> way?


Exactly.


>
> Maybe one workaround (kludgey, and only partial) is high-altitude
> microwave relay airships that feed off ground transmitters and output
> into GEO. But then you have a whole host of new engineering problems.
>


It would probably be cheaper to move the entire thing to a high desert, like the
Atacama desert of northern Chile, and
do adoptive optics.

Marshall


> -michael
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