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Directv circular dish with dual LNB connected
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If you mean here that you have one LNBF on your dish with two outputs, then the swicth might be defective (that is assuming you are using good RG6 cable with no splitters in the middle).
If you have two LNBFs on your dish, then you will need to use a 4x4 switch (item # 7 here:
http://sadoun.com/Sat/Order/Switches.htm)