[amsat-bb] Link Budget

Burns Fisher burns at fisher.cc
Sat Nov 7 20:28:33 UTC 2015

While it appears that you are right about the link budget, one of you
arguments holds only *some* water, and that is tracking.
GeoSTATIONARY birds would require to tracking, but there are
geosynchronous orbits (i.e. 24 hours, but not necessarily 0
inclination and 0 eccentricity) which would move north/south or
east/west in the sky over the course of a day.

And regarding the moon:  Another argument against it is that it is
darned hard to land on the moon.  Lots more deltaV required.


Burns W2BFJ

On Sat, Nov 7, 2015 at 2:57 PM, Joe <nss at mwt.net> wrote:
> Can anyone here run a link budget for me?
> I'm in an  slight heated debate with some people, About how they have heard
> about the possible Geo synchronous bird coming up, and they are all
> wondering why don't "THEY" I like the "THEY" part, anyway why don't they
> just put it on the moon.
> I gave them several reasons why a Geo bird is better,
> 1- It is there 24/7 where the moon is visible less than 50% of the day
> 2- the Geo bird doesn't move ( or extremely little) so set the antenna and
> forget it. Where the moon requires tracking programs and antennas that can
> move in AZ and EL
> 3- Useable "Window" The amount of the earths surface that can see either is
> soo close to the same why bother I bet a geo bird would be at least close to
> 90% of what the moon see's
> 4- And finally antennas and power required. The moon being soooo much
> farther away the amount of power needed each way has to be MUCH more. And
> thats what I was wondering say you had a nice decent transponder in Geo
> orbit. what power levels say ERP I guess is needed each way?  then drop the
> same transponder and how much more erp each way will be needed to have the
> same level of contact quality?
> Joe WB9SBD
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