Power Flush, part deux
The most effective technique is one that ensures all the Bev bits stay in the LNB and don't enter the coax.
Since the receivers powers the LNB with 13 to 18 V D.C, a larger A.C. voltage is recommended.
48 or greater, generally.
110 V.A.C. applied to the coax seems to work well with all Bell LNBs, is readily available and ensures that no stray bits enter the coax any further.
Of course this is NOT a homeowner recommended procedure and should only be attempted by a certified *C installer.
Bev installers have not been trained in this technique as doing the opposite has shown to have no ill effects and the linear bits adapt readily to their new circular home.
If you neglect this vital step, the presence of the circular bits can confuse the *c unit and compete with the normal video payload.
The net result is deteriorated signals that often appear washed out, fuzzy, and if the set is HD, almost like they dropped half the bits and ran it in 720p.