Are you talking feedhorn or lnb?
I dont ever remember an LNB having scalar rings that was usually the feed horn assembly, (i.e. Chapparal feedhorns with C/Ku throat and an "S" port if required!
c/p "the scalar ring on a c band dish blinds the feedhorn from sidelobe interference and noise. Its always best to use a scalar ring on a prime focus antenna"
This is a dual C and Ku band assembly feedhorn!
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