t TNC KENWOOD 4 PIN PIN 1 PIN 1 PIN 3 PIN 2 PIN 4 SPEAKER + PIN 2 PIN 3,4 TNC KENWOOD 5 PIN PIN 1 PIN 1 PIN 3 PIN 2 PIN 4 SPEAKER + PIN 2 PIN 4,5 TNC KENWOOD 6 PIN PIN 1 PIN 1 PIN 3 PIN 2 PIN 4 SPEAKER + PIN 2 PIN 6 TNC KENWOOD 8 PIN PIN 1 PIN 1 PIN 3 PIN 2 PIN 4 SPEAKER + PIN 2 PIN 7,8 TNC KENWOOD TR-2500 PIN 1 Large Tip PIN 3 Large Sleeve PIN 4 Small Tip PIN 2 Small Sleeve TNC KENWOOD x600 (*) x1xx (*) x15 (*) x5 (*) PIN 1 Large Ring PIN 3 Large Sleeve PIN 4 Small Tip PIN 2 Small Sleeve (*)NOTE: SMALL 'x' designates any number. For example, x600 could be 2600 or 3600 etc. Also note that the x1xx, x15, and x5 are TH series.