Wayno, here is some info that I copied from another post relating to your problem.............
Actually very easy to turn off the alarm! The user guide is pretty lame, but a couple of minutes with the remote in hand and waalaa, alarm turned off. I had inadvertantly turned it on when trying to set a wake up alarm. Turn the radio on and put on the noaa channel, press the alarm button on the remote and watch the display (there is a little speaker/horn icon). Once to turn on and once to turn off.
Peace
Dave