Note, that the diagram above show the use of a multi-way switch uses a dual LNBF. In order to understand the need to use a dual LNB with a multi switch, you must know that the satellite signal broadcasting from the satellite broadcasts in two different ways. Either Horizontal & Vertical for FSS FTA or Right Circular & Left Circular for DSS. Horizontal and Left Circular operate on 18V DC and Vertical & Right Circular operate on 13V DC. When you use a multi-switch, the input ports for the LNB is marked as 13V or 18V. If you only use a single LNB and run your one cable to the 13V port, you can only get channels that are broadcasting on Vertical or Right Circular. If you install it on the 18V port, you can only get signal from Horizontal or Left Circular transponders. When you use a dual LNB, one port will provide Horizontal or Left Circular, the other provides Vertical or Right Circular
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