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Most people don't know enough about physics to understand radio broadcasting.
If you are talking about the first letter of the call sign, it doesn't. Each country is allocated a set of initial letters; the US has K, N, and W. (N is seldom used.) Canada has C, England G, France F, and so on.
You're mistaken. The eastern portion of the U. S. has radio stations that use W. The western portion uses K. It's a system that was set up years ago to distinguish between the two. I don't believe that it has anything to do with the signals, power, or technology.
The stations East of the Mississippi River start with a W. The stations West of the Mississippi start with a K. It has nothing to do with watts and kilowatts.
The letters K and W originated early in the 20th century as part of a worldwide index of ship radio stations. K stood for ships on the East coast, W for ships in the Pacific. For some reason, when the letters were extended to land-based stations in 1923, they were reversed, with the Mississippi River eventually adopted as the dividing line.
In radio call letters, it doesn't. K designates western stations in the US and W designates eastern ones. Check out the following link if you think I'm wrong. They even show a map of the old and new K/W boundaries.
http://www.oldradio.com/archives/general...
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