Since a few weeks the new Geostationary HamRadio Transponder QO100 is switched on for Operation.
By far the best way that i encountered to TX and RX is the Dual Patchfeed from Mike Willis and UHF-Satcom.
I have written 2 Guides with Step-by-Step Instructions on howto build the Plates for the Patchfeed and on howto assemble it.
http://www.oe8hsr.at/blog/wp-content/uploads/Manuals/BuildingThePlates.pdf
http://www.oe8hsr.at/blog/wp-content/uploads/Manuals/PatchFeedAssembly.pdf
There is also a good Article on how the Feed works on the Blog of UHF-Satcom:
https://uhf-satcom.com/blog/patch_antenna
The new Transponder works really good and can be received with minimal Effort and Equipment.
Also the transmission Side is easy to acomplish with minimal Effort.
Nice Job AmsatDl
Best wishes
Hans