Batboard

I currently have a couple gm338(cdm1550) radios setup as a repeater using NAND's Diagram to crossband the repeater.

Now, I want to swap one of the Motorola's for a Kenwood TK-830h so I have a bit more power output(100w)

Problem is that there is no COR on the rear plug of the radio.

Can anyone help me out with either a diagram/direction to build a COR circut or hopefully a point PCB where I can get COR from out of the radio

you can use the PTT as COR

IC103 pin 4. It goes high but I don't know to what. Jumper that out to the rear plug.

Robert