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Message: <blockquote data-quote="Robbo" data-source="post: 703623" data-attributes="member: 256551">All 1.8m dishes are not the same though, they won't all be the same f/d. When I used the adjustable it performed as well as the one that was made for the dish.It does'nt mean it will work well on the 2.5m, but it doesn't mean it won't either. Suck it and see, the f/d of your dish is in range of the adjustability of the feedhorn If I recall.The bore of the feedhorn will determine the frequencies that pass down it, too small, and it will filter off the lower frequencies very very well. Waveguides are almost perfect high pass filters.</blockquote>