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Message: <blockquote data-quote="nelson_b" data-source="post: 722276" data-attributes="member: 296628">hi -this  year -- until  recently  i  have  been  using  a chaparral co rotor  for  C band   on  the 1.8 offset  motorised dish and i  found that  the  skew  control sometimes   needed to  be  altered a little  between  different satellites  when  viewing  circular  transponders  to  get  the  best  signal  strength don,t know  if  the  same  would  apply  on  a prime  focus  though --as  i,m sure  you  know  the dielectric  plate  is  "fixed " in the co rotor - and the  skew is  altered  by mechanical  movement  of  the  probe  in  relation  to  the  plate cheers  nelson.b</blockquote>