Hello, new to the forum here. I have a cobra 20 plus cb with an external speaker and a small pa horn ready to install into my SUV I am testing it out on a spare battery I have before going through all the effort of installation. My radio turns on, I can access all channels, the external speaker works, but I cannot tell if I am broadcasting or not when I speak into the mic. Lights on the radio indicate the sound is being picked up, but I have not had any responses yet. I have heard no signal of anyone talking on any channels. My antenna is not up real high or out in the open but this my first time testing a cb setup. Also the pa horn does not want to work either. I get a faint humming noise and when I depress the mic to talk it stops humming but no sound comes out. It is a 15 watt special small pa horn. Any help is appreciated before I install. Sorry for all the noob questions. I am really excited to start utilizing this equipment especially for off road expeditions. Thanks.