IC27.2
BY CUTTING THESE WIRES AND ATTACHING THE GREEN WIRE TO THE HIGH SIDE OF
THE VOLUME CONTROL  AND  ATTED WIRE TO SWITCHED 12 VOLTS 
A TNC CAN BE WIRED TO JUST THE MICROPHONE CONNECTOR AND MAKES A CLEAN
INSTALLATION PROVIDED THE RADIO IS DEDICATED TO PACKET.

TO GET BACK TO THE SUBJECT OF THE ALTERNATE MODIFICATION FOR THE IC-3200A 
YOU CAN REWIRE PIN 8 OF THE MICROPHONE CONNECTOR TO THE HIGH SIDE OF THE
VOLUME CONTROL AND AVOID THE MUTING CIRCUIT BUT IF YOU PLAN TO LEAVE
THE TNC WIRED PERMENANTLY TO THE RADIO AND ALSO,TO USE THE RADIO ON VOICE
YOU WILL NEED TO CHANGE A RESISTOR IN THE TNC SO AS NOT TO LOAD DOWN THE
AUDIO AT THE VOLUME CONTROL. THE VALUE OF THIS RESISTOR WILL HAVE TO
BE DETERMINED EXPERIMENTALY.

IF ANYONE REQUIRES MORE INFORMATION OR ASSISTANCE WITH THIS MATTER FEEL
FREE TO CALL CLARK, WB4FOW, AT  305-594-4313  MONDAY THROUGH FRIDAY 
10AM TO 6PM OR LEAVE A MESSAGE IN THE WB2WPA OR N4LDG PBBS'S.

GOOD LUCK!