antennaejim

I would like to know if anyone may be able to help me out with a problem. My atari 5200 works well visually, but the audio is all static. This must be an internal problem. Any help or direction would be greatly appreciated. This is a 2 port model. could it be the RF cable? If so why does the picture look great but the sound just isn't there? If anyone has any pointers or repair knowledge please help.