I'm trying to figure out how to know what the LNBF output frequency is for a given transponder, and in particular what's realistically the maximum frequency I should expect. Using the maximum FTA downlink frequencies I could find: Max CBand Transponder: 4192 MHz Max KuBand Transponder: 12180 MHz ... Here are the calculations I'm doing. Anyone know if these are correct? (C LNB L.O.) - (Transponder) = 5150 - 4192 = 950 MHz (Transponder) - (Ku LNB L.O.) = 12180 - 10750 = 1430 MHz ... so, that means that the highest LNB output for C band comes from the lowest transponder frequency, and the highest LNB output for Ku band comes from the highest transponder frequency. Right? Min C Band FTA Transponder: 3706MHz 5150 - 3706 = 1444MHz The reason I'm asking is because I've been reading conflicting things, and more importantly that the lnb output range is 950 - 2050, and I'd like to know what the realistic output range is. It might not make much of a difference, but if I'm going to play with the LNB output, it's nice to know my max frequency is 1.5GHz and not 2.0GHz. Any reason I should be worrying about 2.0GHz? Looks like 1.5GHz will be enough. Whew. Thanks for any help from you folks that have spent too much time with this hobby.