i installed a new bsc621-2 lnb in place of a universal lnb i was using. i was getting good quality on tps 11720 and 11800 using the universal lnb. after insalling bsc621-2 lnb, i can only get quality on 11800tp.
settings are
lnb type standard
lnb freq. 10600

bsc621-2 lnb operates on 5150 c band and 10600 ku band.
i tried skewing lnb, did not help.