if we have Fr:11172 and Symbol rate 27500 then subtract transponder frequency with lnb frequency
11172-9750=1422 and then subtract 1422 From 5150 Or
5150-1422= 3728
here 3728 becomes c band frequency .
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and if you want to change c band into ku band frequency then here is eg.
if we have c band frequency 3728 then subtract it from 5150
5150 - 3728 = 1422 and then add 1422 to ku band frequency 9750
1422+9750 = 11172.