Hi Paolo I am using MMTTY with TS-930 and IC-756Pro, and having a same problem with TS-930. I have two solutions, both worked well. 1. Insert an Inverter (one step TR switch) to TS-930 side. 2. Drive a small reed relay, and keying FSK by contact. Finally, I selected method 1. GL Hisami 7L4IOU