A number of PCARC club members including Bob KK4DIV, Jim KK4LIX and Greg N4KGL have started experimenting with amateur radio satellites. If you are curious about satellite comms join the discussion at the PCARC clubhouse at the Wednesday meetings.
This article has good background but the satellite specifics are going out of date.
Here is another on-line resource and it has the current satellite info
Jim K4LIX has built his own satellite antenna.