[RTTY] RTTY/Power Kenwood TS-570

[druokonen]

The previous question regarding an Icom rig and runing 100 watts on RTTY brings up my problem. I am runing FSK RTTY  with my Kenwood TS-570Sg and twice I have burned out components in its internal auto antenna tuner. The manual with the Kenwood states that the unit is cable of runing 100 watts RTTY. My repairman states not to run more than 30-40 watts with this unit! I am currenlt runing 35 watts. My antenna is a 20' Force 12 flagpole (basically a vertical) fed with RG8U and tunes easily on 20 meters with the auto tuner. My Yaesu FT-1000MP Mark V Field also with auto tuner tunes this antenna easily as well. I realize that RTTY is a continuous duty mode but it seems that if the rig's rf amplifier circuit can handle 1oo watts RTTY that the self contained auto tuner should as well? I would appreciate comments and wondering if others using this rig have experienced similar problems? Don K3PRN