FTA and OTA

You may have a problem with powering the pre amp for OTA.

The satellite receiver also sends voltage up the cable wire to the LNB to power it and to switch polarization of the LNB.

Your diplexers must pass the voltage up the wire to both the LNB and the pre amp.

If the required voltages are too far apart, or polarized wrong you may fry one or both of your LNB and preamp.

It is probably best in this case to run two lines, one to the LNB and the other to the preamp and antenna.
 
What I'm meaning is the pre-amp power supply inside. Would I connect the diplexer before or after the power supply?
 

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