Racal pin out question

[concretesnail]

I'm trying to find out the pin out for the racal frontier units. I want to swap the racal connection to a nexus type plug. I don't mind the cut and solder route but a little help regards a wiring diagram or colour code would be nice if anyone has any idea. Or a test method to work it out?

 

[Pseudotectonic]

From this page: https://www.devtsix.com/racal-frontier-ra5500-t15208.html

Colors from the racal frontier to the ptt unit are:
Orange - PTT
Red - Microphone
Green - mic/ptt Ground
Brown - Speaker
Black - speaker Ground.

Click to shrink...

But I suggest checking with some trial and error with spare wires and alligator clips before actual soldering.

 

[concretesnail]

Cheers fella. That's a great help.