This is a tough one since it sounds like the problem is intermittent. Is this a new radio or used one? Is this a new install on this truck? Delta gave you some great advice about noise from other electronic gadgets in the truck. If it happens to be in the radio, it's either a bad or weak capacitor, or a bad solder joint. Yes you can have an alignment done to the radio if you want. About the only way to get the noise floor down on the radio is to have a tech replace certain parts in the recieve section of the radio. And even that's questionable. The bad thing about spending lots of $$$'s doing that to your radio, is that you still will pickup a lot of noise through the antennas.
Newer radio, new install (everything), thanks for the advice. Any idea how much the tune and alignment cost? Gps, phone charger, qualcomm, stereo, cms unit. -------- Also update, seems to happen in big cities, drove all through the country today and didn't happen once i left atlanta. Also got 6-7 miles through the hills in north Carolina/Tennessee up the 40.
I'm quite sure it would stop if I did that. I'll report in if it does it in my way back to ATL tomorrow or while the truck is off.
Update, it stopped when i unplugged it, not a cb issue I'm assuming. It happened again today for an hour or so coming down the SC121 to the I20 which is pretty much a rural area. When I get some time I'm going to recheck my grounds and connections in my antenna. But since I just set it up last week I doubt anything is coming loose.
You got it. check the ground activity under the stud that holds the antenna in place, make sure it is seeing bare clean metal and that the plastic washer is on top and not the bottom. get back to me when you can establish these things.
To be as accurate as possible, i will need specifics. antenna type, coax type, location of antenna, power cord placement hookup, and immediate swr reading.