Quote Originally Posted by southernredneck1 View Post
Don't think its engine noise because it does it when the truck is off. Connex CX3300 FHP. Texas Star DX 250 amp, 1' RG-213/U Mil-Spec jumper. 18' RG 5 8A/U coax. 5' Fire Stik. The noise level drops when on ch. 18 and disappears when on ch.20.
your radio might be picking up something electronic somewhere in your electrical system. you can pick up almost any kind of noise when using a cigarette lighter plug. best thing to do is wire the radio directly to the battery. that way your getting clean power instead of dirty power like you get with a cigarette lighter plug. also since you are using a Connex the best thing to do is wired to the battery so its getting full power.