Hi, I recently got my dish pointed on amc 21 (125w). My siginal strenth is 99% and my quality is 82% on my coolsat 8000. Create and World come in fine but the 3 PBS hd channels come in slightly digitized/ blocky, yet the audio is perfect. Does anyone know what would cause this or fix this issue? Maybe there is a setting I have over looked. Thanks for any help on this issue, Chip