I am going to rework the system so it uses an Easy Pcb and a Pro Mini rather than the Leonardo board.
I think I might be seeing a voltage drop in my point to point dupont wiring from the Arduino to the Radio.
I'll update you all once I get a chance to make the change.
Bill
Sorry, one more mistake. On the board, the UART port connector rotates on 180 degrees. In this case, UART on the Orange PI Zero and UART on the board should be connected with wires.
