Batboard

I have a few GTX portables and was trying to setup one as a reciever and one as the transmitter for my pcrepeatercontroller project and have not been able to find a simple DIY pinout diagram for the speaker/mic ports on the GTX portables.

I have the Motorola pinout that uses multiple capacitor, coils, etc.. but was hoping to make a cable simpley like my HTX-202 radio with just a few parts.

Any ideas?

GTX portable uses the same speaker mic as the GP300.

I was hoping for something a little more simple...

If you need to ignore the
components then just use the plug terminations that are shown. Among other things you need to know is where the
PTT switch is in the circuit and how it works. In earlier versions the PTT was a third wire that went to ground for PTT but
in more recent times Motorola, Icom, and others have incorporated the PTT function into the microphone audio line.