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Matek f765 & rssi

Need a little bit of help please,
Just started wiring up the f765 with all that i need
I am wondering though if the rssi port will need the + and ground cables as both the rx and the fcs both have power, so would it just need the signal cable

If not, there isnt any information on how to wire this up, im assuming the rssi pad on the board is for the signal, but not sure about the rest if it needs it.

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