Ok thank youCrambone,
From the looks of your schematic-
Audio- pin 1-White
Shield-pin 2-Shield
RX-pin 3-Black
TX-pin 4-Red
You may need to use Blue and Shield on pin 2.
Below is from the Astatic wiring handbook on CBTricks.com
http://www.cbtricks.com/mic_manuals/astatic/astatic_wiring_handbook.pdf
View attachment 32830
73
David