TM2550.2 CONNECTION FOR KENWOOD TM SERIES TO PK-232 TNC 2530, 2550, 2570, 3530 KENWOOD PK-232 PIN 1 ------------- PIN 2 PIN 2 ------------- PIN 5 PIN 7 ------------- SHIELD AROUND LINE FROM PIN 1 TO PIN 2 PIN 8 ------------- PIN 4 EXTERNAL SPEAKER JACK AND LINE FROM RADIO HOOKS TO PIN 1 AND PIN 4 OF PK-232 PIN 1 IS RECEIVE AUDIO AND PIN 4 IS SHIELD.