[Hammarlund] SP600-JX-17 HOOK UP TO DRO-50

[tgrieco]

I have a Hammarlund SP-600-JX17 that I am trying to hook up to my radio.
Communications Electronics DRO-50
frequency readout made specifically for this unit. I guess only a hundred
were made. It has a bnc off the back, but can't find where exactly to
connect the wire to the radio. I have had excellent help, but still not
working. The radio is fine and so is the DRO. When I am on 14 Mhz it reads
17Mhz.Any takers out there??
Tim