Parts List
R1 4.3 k?.
R2 2.2 k?.
R3 - R4 10 k?.
D1 - D2 L4148 or equivalent
TR1 - TR3 2N3904
P1 9 pin D socket with shroud.
P2 connector to mate with the programming socket on the radio (not shown on schematic)
About a meter of 3 core cable.