The transponder in the satellite seems to be very professionally made. I didn't find many details when doing a search on it.
Who has designed the transponder? Is it the same company that designed the commercial part of the satellite or is this designed by radio amateurs? Do anyone have some more info, block diagrams and pictures of this transponder used in the satellite?
What antennas are used in the satellite on S and X band? It must be quite wide pattern, as the coverage area is so huge.