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Message: <blockquote data-quote="mikethebike" data-source="post: 25288" data-attributes="member: 175983">Thanks again Barney, but problem solved!Taking another look inside the polariser I saw a metal collar (aluminium I think) with an elliptical slot, its end flush with the LNB interface (C120).  Attacking with a drift from the feedhorn side (not easy!) brought the collar and polariser coil out (see piccy), and bingo - signals of both polarities come thundering in!So thanks to Barney and especially Rolf for your help.  I knew there had to be an explanation, but when you don't know what it SHOULD be like, it's all the more difficult!</blockquote>