I found a copy of the manual and I'm not sure that radio is designed to have the head separated from the rest of the radio, especially as some of the controls are on the microphone. From what i can see in the manual, there is no cable separating the two pieces. It looks as though the connection between the two is built-in and is made when the head is attached. If this is the case and there is a cable, then it's likely proprietary and no longer available.