With a extra dielectric plate in the waveguide its works for lineair signals .
I receive Astra 19.2º E with such plate at a SL3K KA Directv lnb and with the other horn Turksat 42º E
may be that's way I can't lock this transponder @ 24.8°W
I use a Circular LNB to see a Liner Ka
can you share with us how to make this extra dielectric plate ?