Normand Slowskan wrote:
I have a three year old HT ADI AT-600. I was lplaying around and
somehow I locked it up on transmit on both band (2 meters and 440)
Does anyone know how I can unlock this HT?? I have tried all the
combinations that I can think of to no avail. Please help? Thank You

According to the AT-600 manual, item 2-7 Inhibiting Transmissions:
Press F+[3 P.L.] locks; repeat to unlock.

73 Don K6LTS