Carl Blare

Being smart takes a long time, especially when information remains hidden for so long. Just two years ago, after 40-years in broadcasting, I finally heard about “the critical hours,” a well known AM broadcast term referring to hours before sunrise and after sunset.

Now, while reading an article on R.F.I., radio frequency interference, comes the term “the fading wall.” You probably know all about it, but I didn’t.

The fading wall is the area where the AM signal reflected from the ionosphere reaches to ground.

Of course Part 15 transmitters aren’t powerful enough to reach the ionosphere, but we are affected by fading wall syndrome coming from distant stations.

What else is there to know? I don’t have the slightest idea.