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@jmorris @azonenberg I tend to prefer making the feedhorns - usually Pickett-Potter dual-mode or with integral chokes or septums. Wideband transitions almost always need to be made in two halves to get the sharp corners to mate with rectangular waveguides. I can do centrifugal casting, but getting a good enough finish is tough. Oval iris narrowband transitions are easy enough of course, I can make those on the manual mill. SMA, N and 3.5/2.91 mm transitions to w/g are always popular