ProGate cable is to be used between ProGate and a radio device to connect them.
This is similar with accessary circuit of radio device.
Tha main feature is the fire of PTT lock/unlock from ProGate. It varies depending on the electrical characteristics of the radio device.
In case of the fire of PTT lock/unlock from a radio device, ProGate is using SAD algorithm to detect it.
* SAD(Scratch Activity Detect)
ProGate H/W 4 Generation
4 Generation have a PTT-IN and PTT-OUT for COR. They can be used for mobile(vehicle) radio devies.
ProGate H/W 3 Generation
3 Generation have only a PTT-OUT switch. So there is only SAD/VAD for PTT-IN detection.