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Message: <blockquote data-quote="s-band" data-source="post: 970077" data-attributes="member: 407744">Yet more thoughts....The scalar ring is mainly to improve the front to back ratio of the feed and to reduce spill over where the feed "sees" ground noise if it covers more than the dish area (especially for PF). In the case of the offset it needs to reduce the beam a bit more than a PF. I guess that for an offset the feed needs to be well inside the scalar. In setting the scalar, it may be better to use the EBSPro route as you can  measure S/N directly and it's the N that the scalar will affect most.If you want the last 0.1dB, it may be worth raising the dish above the building so that any overspill "sees" cold sky as opposed to a warm building.</blockquote>