I am afraid your LNBF is too old for receiving digital signal. It has workd fine for analog, but digital signal requires more sensitive LNBF. I recommend your buy one of the latest LNBF in the market with a 0.6 db noise ratio or less. We have lisghtly used LNBF on clearance for $12. See it at
http://sadoun.com/Sat/Order/LNBFs.htm