OK i am completely new to all of this. I just bought a Uniden BC92XLT Scanner a few days ago. I got the frequency for the local police dept. from a friend who has a scanner, for some reason on my scanner though won't pick it up, all I hear is a continuous obnoxious sound that sounds like a motor running, whats the deal? I know its the correct frequency because it I have used his before and everything worked fine, his is just a different kind of handheld uniden scanner (don't know the model though)