Question about AM Station Power - Why so low?


Hi all,

Last night I had a nice catch of WELD, AM 690, from Fisher, WV to my home in Southern MI (USA).

The distance was 330 miles, but what made it cool (to me) was that the station was only putting out 14 watts of nighttime power.

Why so low?  And why 14?  Why not 15?

Are they limited by the FCC or just don't want their signal to go too far?  I thought the general intention was to reach as many listeners as you can?



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