No worries, thank you Simon for the information.
I haven't noticed the feedback issue on mine.
Not sure where it coming from since Q6 is in-powered in RX.
Worse case we can put an emitter follower npn on the supply side of the SSM2167 and extract the T/R line from the raduino (I have done that on mine) or bring the TX supply and regulate to 5V.
I will check that issue here.
73, John (VK2ETA)