[amsat-bb] Link Budget
nss at mwt.net
Sat Nov 7 20:00:38 UTC 2015
oops I missed Now drop the same transponder on the moon,, and how much
more is needed?
The Original Rolling Ball Clock
On 11/7/2015 1:57 PM, Joe 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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