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Calculating LNB Output Frequency (Project Part II)
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. :P
12-15-2009 12:08 AM