[amsat-bb] Link Budget

Jerry Buxton amsat at n0jy.org
Sat Nov 7 20:45:13 UTC 2015

Actually, we are working on one that will be orbiting the Moon...


On Nov 7, 2015 1:57 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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