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What is an LNB?
LNB stands for Low Noise Blocker. This is the device that sits at the end of the arm on a satellite dish. It receives the signals reflected off the dish surface. If you were to place your hand between the dish and the LNB, your receivers wouldn't get a signal. However, if you placed you hand between the dish and the satellite (without blocking the path between the dish and the LNB, you would probably still get a picture on your TV. This is because the signal is narrower after it reflects off the dish.

The dish works by receiving a signal from the satellite. The shape of the dish focuses and concentrates the signal when it reflects it into the LNB. For dishes with multiple LNBs, the signal then runs into an internal multi-switch. This allows all the outgoing lines to relay the signals form all the LNBs to every receiver box you have connected. Without it, you wouldn't be able to watch programming from all the satellites on all your receivers.

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