A drive system for a twistable septum in a feedhorn for use in satellite communications antenna systems. The drive system includes a flexible drive rod, coupled to a drive motor, which bends to accommodate off-center coupling with the septum drive wheel....http://www.google.se/patents/US4829313?utm_source=gb-gplus-sharePatent US4829313 - Drive system and filament for a twistable septum in a feedhorn
