[amsat-bb] Link Budget

Joe nss at mwt.net
Sat Nov 7 19:57:30 UTC 2015

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?


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