Thanks Dave.
I am going to try controlling the PTT through the nano to control the clock better before the PTT off is triggered. So a new nano input from the mic PTT and a new output from the nano to a 2n3904 to switch the PTT line on the board.
I dont have AGC or CW on my rig so less complications.
I have a transistor across the lm386 input that switches to ground when PTT is pressed at the moment and I have no audio pop. I cant remember how I triggered the transistor though so Ill have to work through that and hopefully it will be compatible with this new plan above.
73
Simon VK3ELH