Every day on nationwide interop frequecy designated V MED 28 (155.34 MHz) I hear some hospitals around Lafayette doing radio checks. It appears that every day a different hospital takes a turn at being the one to call all the rest for the radio check. Each call to a particular hospital is preceeded by tones that sound like WEEEEEEEEE WEWEWEWEWEWE WEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE WEWEWEWEWE WEEEEEEEEEEEEEEEEEEEEEEEEEEE. Does anyone know what that's all about? What are the tones for and what would they use this radio frequency for? Is it just for backup in the event of a major disaster that reneders phone or computer networks inoperative. These tones are some type of signal that has been around for a while. I remember back in the 80's when Acadian Ambulance units used this same frequency to transmit these tones to a hospital followed by information about patients that they were transporting.