MC-45 DTMF.





                                  PIN 1 UP.

                                  PIN 2 +8 VOLTS.

                                  PIN 3 CHASSIS GROUND.

                                  PIN 4 PTT.

                                  PIN 5 MIC GROUND.

                                  PIN 6 MIC.

                                  PIN 7 RX AUDIO.

                                  PIN 8 DOWN.

NOTE:

Early versions were supplied with 5 pin round plug (see mk1 )