Dear Kenwood Customer: Thank you for your e-mail. For any packet information for hooking up a TNC to your Kenwood amateur radio please go to: http://www.packetradio.com/ http://www.packetradio.org/ http://www.amateuradio.org/ http://www.sedan.org/ If you need further assistance, please e-mail us again. Sincerely, Kenwood Customer Care