[Repeater-Builder] motorola repeater cable problem

[dan d]

I have two Motorola sm50 mobiles using a repeater cable that goes
between the two at the option plug in the back. I have tried every
configuration two get this to work with no results. Before I condem
the cable I got off ebay does anyone know of any mods or settings that
need to be done to get this simplex repeater up and running. I have
confirmed the radio operation itself and they are good to go.