Hi,
   Actually, you can explisitly set the T90's output power even if you
have forgotten which setting you last left the radio (high or low).

   IF you hold down the 3 button (the same one that toggles power) and
turn the dial on the radio to the right, the power will be set to high;
turning the dial to the left will set the power to low.  Turning the dial
a lot to the right or a lot to the left will still leave the power set to
high or low respectively, because the selection does not wrap around.

   Most functions on the T90 *seem* to work this way (holding a button
toggles a function, and holding a button while rotating the dial lets you
pick the setting for the same function).

   If my explination doesn't make sense let me know and I'll try another
way.

Thanks,
Ivan.