Does anyone have any ideas on how I could reduce computer noise on 6 meters on my IC706 that is installed in a 93 GMC pickup. As soon as I turn on the ignition, the noise starts and is about an s-5 to s-7 on the meter. My power conections go out to the battery and the antenna has a good ground. I do not have any trouble on any other bands. I am new to the 6 meter activity. Thanks