| Problem | Likely Cause | Solution | | :--- | :--- | :--- | | | Impedance mismatch; Radio thinks you are talking. | Check if the cable is rated for "High Impedance" or "Low Impedance" to match your radio. | | Mic doesn't work at all | Broken shield ground or bias wire. | Test continuity with a multimeter from tip to tip. Replace cable. | | Audio is quiet/mono | Wiring mismatch in the ground. | Ensure the sleeve is properly grounded to both the headphone and mic common ground. |