I see it as well. You are not alone.
FINALLY..... someone else seeing this issue with the noise / pixelation on the Science Channel.
I've posted this issue here and in the directv forums and no one can seem to relate. Out of frustration I hooked up a 27" Olevia lcd flat panel (my normal tv is the kds-60a2020) to the hr20 via both hdmi and component - I see the problem. Based on that alone I can rule out the TV and my cables (doubtful both sets of cables made by different vendors would be bad).
I then checked my signal strength on 103a (or was it b? - which ever is the one people here have you check for the HDs). My signals were all between 94 and 100.
I don't suspect my rg6 cabling or this white noise would happen on all channels and would only be happening to me - not to mmicha, robmfielding, or my buddy in town with the same issue.
This leaves we with 3 culprits - the hr20 itself, the science channel, or the b band converters. If it's the science channel, nothing I can do. If it's the HR20 - I don't even feel like dealing with it. But the BBCs? I guess I could order some new ones.
Anyone else with thoughts or ideas?