I wrote: >You can get the manual, with schematic and block diagram, to see how >the DG-5 used **three** outputs from the TS-520 to accurately show the >frequency...those are the DET, VFO, and CARRIER RCA connections on the >back of the TS-520. I forgot to cite the link to the manual: http://bama.edebris.com/manuals/kenwood/dg5/ Mike / KK5F