(1) The stock RFX-type board does have inadequate uplink/downlink
isolation for full duplex cellular, but this can be improved greatly
by removing the C202 capacitor.
(2) With the C202 capacitor removed, it should be possible to run
OpenBTS on a single RFX-type board without crosstalk creating a
performance limitation. The current OpenBTS transceiver does not
support this, but that is probably due to suboptimal gain settings in
the transceiver code. It has not (yet) been a priority for Kestrel
to correct this problem, but the OpenBTS transceiver really is open
source and anyone who thinks it is really important to fix this has
been welcome to do so all along.