The PLUTOSDR has 2 ports for coax cables (TX and RX). In my situation, in my laboratory I am only able to use one coax cable for both transmitting and receiving (i.e. it is going to be used for an antenna, and there is only one coax cable that goes to the roof). It is possible to do this, as this cable and set up can handle signals in both directions.
My question is: Which port do I connect the coax cable to in the Pluto SDR (TX or RX), if this cable will be both transmitting and receiving? This cable will then be connected to a PA, then to bias-t, then to the antenna in the roof. Should I use a diplexer placed between the SDR and the PA? I am concerned because the frequencies are too close together (uplink: 437.5 MHZ, downlink: 437.45 MHz).
Thanks in advance.