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What is the SWIM Splitter trick? You say just hook up one line and put swm lnb on and switch activate then switch back?

Ok so i am a new tech and have installed about 50 hddvrs. Everyonce and a while i will have this problem. So yesterday i did a 2 room hd dvr setup with slimline 3. Now second floor dvr had great signal 90s all across the board. Activated and verified just fine. 1st floor failed saying 99c was...