Does your B.U.D. move or is it fixed? If its fixed then skew is something you probably never had to worry about as many fixed
C-Band dishes had LNBs with electronic polarity control. Skew is the movement of the antenna in the waveguide (part of the feedhorn) that shifts 90 degrees to adjust between vertical and horizontal polarities depending on what channel you are tuned to. The C-Band birds typically had 24 transponders and as you change channels and thus change transponders the antenna must move to align itself with the changing polarity. The feedhorn assembly has a little blue motor on it that moves the antenna. This motor has 3 wires (red, white and black -- +5Vdc, pulse and ground) that are connected to the analog receiver and gets the control voltage and "shift" command from the "pulse" output on the receiver.
Adjusting the skew will have a noticeable effect on signal reception. If you never noticed any change then either your LNB was of the electronic switching variety or your polarity motor was not working right - in this case you would get signal on only odd or only even transponders. And as they say -- if you don't swing both ways you're missing half the action :lol: :lol: :lol:
kat