Hi Joe,
if they or you would like to play with numbers I can thoroughly recommend a number of Jan King's spreadsheets we are hosted here http://www.amsatuk.me.uk/iaru/spreadsheet.htm
Of course not only the moon much further away but it gets mighty cold on the surface when it is in eclipse...
73
Graham G3VZV
-----Original Message----- From: Joe Sent: Saturday, November 07, 2015 7:57 PM To: amsat-bb@amsat.org Subject: [amsat-bb] Link Budget
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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