Has anybody interfaced a Kantronics 9612 or the KM XL TNC to the accessory port of the Icom IC-9700?

The reason I am asking is there are two IC-9700 users using the same firmware who are experiencing the same issue with both of these TNC’s. Packets are decoded with little to no issue on the receive side, but the transmit side is a different story.

It seems only about 30% of the transmitted packets are decoded by other stations using 1200 baud. The deviation of the transmit signal and the TX delay are not the issue. The same TNC works with no issue on a Yaesu FT-736 and the FT-847.

Thank You, Tim Cunningham - N8DEU