GP340/360/380
Tested on MTX850
Based on reverse engineering of the native speaker mic:
We arrive at this audio/PTT cable for Digirig:
pin1 (SP+) → 3.5mm TRRS tip (RIG_AFOUT)
pin4 (MIC) → 3.5mm TRRS ring1 (RIG_AFIN)
pin5 (PTT) → 3.5mm TRRS ring2 (RIG_PTT)
pin6 (OPT1) → 3.5mm TRRS sleeve (GND)
pin7 (GND) → 3.5mm TRRS sleeve (GND)
Additional info here:
Motorola GP3xx Series PinOut.pdf (437.6 KB)
Renato HB9HSQ reports a successful build and shares additional details:
After several months of use, I can confirm that the cable works perfectly in conjunction with the Motorola GP3x0 and the DigiRig - well done!
I have also sent you some pictures and the connection diagram for the Hirose connector. Maybe this will help someone else. Please note that the Speaker+ pin of the Hirose is connected to pin 2 (Speaker-) of the GP3x0 - this confused me a bit at first, but it works. And I haven’t soldered the Hirose GND1 of pin 3 (option B+) anywhere.
