Manu, Unfortunately the engineer in charge of 899 Software is off tomorrow, which means I can't help driver debug before Wenesday. My understanding & knowledge on 899 is that it's always easy to lock in DVB-S mode. Your problems looks though amazing. Do you know if you can by-pass your software layer and use Centronics <-> I2C I/F under win XP to try a debug cession using our regular software GUI? Do you have such a tool? This shall help understanding 899 behaviour. BR, Olivier