Hello all , name is nico , call on7ndr
have found this interesting info from a DUAL BAND feed from DD1US for QO-100 es'hailsat2 , homemade by Matthias Bopp himself.
looks very interesting article how matthias has build the dualband feed system with also help from other german amateurs.
go to webpage http://www.dd1us.de/
then choose ,>> " home downloads"
here you will see the dualband feed descibed , article is in PDF format , since it is 5 mb i can not post it here as attachment sorry
hope you enjoy reading his article to . good job from matthias
73 nico
picture dualband Es'hailsat DD1US feed