I trying to set up switch dp34. Signal from three sats 119,129,118. After installing the switch do I need use a spliter to feed both (sat1-sat2)input at back the rec ?? Or I should use just one side of the tuner. (SAT1) only ??? Why rec have two tuner SAT1 and SAT 2 on the back side of the rec.I only have one rec in my apartment Thanks.