OK, you are probably right. It's been a while. I played in broadcast some time ago. I think you jogged my memory further. I think the way it worked is that

OK, you are probably right. It's been a while. I played in broadcast some time ago. I think you jogged my memory further. I think the way it worked is that the transmitter over-modulation due to illegal levels would/could interfere with adjacent channels and that's why the FCC made the rules.