Nothing. It will works as before. Just in case - run switch matrix check to accommodate the change and be sure all signals coming OK.
About the separator: it's special type - it's 'separating' different signals to outputs: one is 'high' band, other output is 'low' band when these comes from DPP switch or LNBF.
About the separator: it's special type - it's 'separating' different signals to outputs: one is 'high' band, other output is 'low' band when these comes from DPP switch or LNBF.