I have a FTDX560 and it is missing the plug that goes in to the jack in back of the radio for the external VFO. From my understanding this "Plug" must be in the radio so it will work. I looked in the manual and did not find the pin out for this jumper plug. is the plug needed? Could I use a jumper wire'(s?) if some one could send the pin out. Thanks de John K�CQW