Why does my CB radio sometimes make a loud squealing noise even when the power is turned off?
You probably have a Cobra CB radio with weather channels that includes the Weather Alert feature. Some models with Weather Alert are equipped with a special circuit that picks up the emergency signal transmitted by Environment Canada and the NOAA Weather Radio. Your radio can detect this signal even when your CB is turned off. Your CB radio will then generate a warning tone indicating that you should tune to a weather station to learn the nature of the weather emergency. Cobra CB radios with Weather Alert will typically make a noise for about 1 second when power is first applied (even if the power switch is off). This is normal, due to the Weather Alert circuit powering up. The weather alarm on Cobra CBs is always at full volume. This is necessary in order to ensure that you are notified even if the volume is turned off. If you want to disable Weather Alert, simply turn the weather knob to the “OFF” or “0” position. If your weather knob does not have an off position, switch to a weathe
