Strange behaviour testing this. I set it to 87.5 which works fine for the most part but sometimes I start picking up a black radio station apparently on that frequency. Now the odd thing is the station is fairly strong on that frequency but if I unplug the N900 charger from the car's cigarette lighter the station disappears. It seems that the car cigarette charger is affecting the performance of the FM transmitter. Is there a specific type of charger that can be purchased that doesn't produce this sort of scenario?