I also have tried to configure TVHeadend to talk to the Optus D1 satalite.
I confirmed my LNB is running on 10750000 made the changes in the dvb_satconf.c file and recompiled, however it is coming back with "No Signal"
Hardware is Sundtek SkyTV Ultimate III (USB 2.0)
Adding network by location appears buggy at the moment as the muxes get added with no satellite config... you need to add the manually after configuring the LNB settings. However when scanned they come back with " No Signal"
Any ideas what i've done wrong.