If you have a circular DBS or DSS LNBF for Dish Network, DirecTV, Bell, the LO frequency is typically 11250 and cover 12200 - 12750MHz downlink frequency range. If you want to convert this type of LNBF for receiving free to air linear FSS frequencies, the tuning slugs must be adjusted so the LNBF LO is 10750 and receive the 11700 - 12200MHz range.