We are trying to hook up a 1000.4 dish to a vip211 receiver. We ran one cable from the receiver to port 1 on the lnbf. We get signal and locked on from 72 satellite but can't lock on 77 or 61.5. To properly align the dish should we cover the 2 outside lnd's to ensure we are getting satellite 72 on the middle lnb. Thanks.