Okay, here's the deal. I used to have one single tuner and one dual tuner and everything worked fine. I now have two dual tuner receivers and the video signal is occasionally not detected to record a program. I have a Directv triple lnb with three cables running from the dish to a cable junction box. The cable junction box has two separate cables running to receiver 1 and two separate cables running to receiver 2. I installed a Dynex 3x4 Multi-Switch (model DX-MS102) in the cable junction box and used two of the three lines from the dish to connect to the Sat inputs on the Multi-Switch. I connected each of the four line outputs on the Multi-Switch to a separate cable line. Two of the four lines went to receiver 1, and the other two went to receiver 2. I now only detect one satellite (101 I think), and occasionally a show is not recorded because the "video signal was not detected." The Multi-Switch diagram states that a Diplexer is needed at the receiver, but I assume that is when only one cable is run to a dual tuner receiver. Do I have the wrong type of Multi-Switch? Please help!!