Microphone Wiring Diagrams - wwwottRadio How to fix a CB Microphone. The following microphone wiring diagrams are for the majority of CB and 10 meter radios available. Microphone Wiring Diagram - CB World Wiring Color Codes for Astatic 6 Wire Microphones: White - Audio. Shield - Ground. Blue - Common for Switching. Red - Push to Talk (Transmit). Black - Receive. Yellow - Receive Ground (not normally used).