Why does the FCC no longer assign three letter callsigns for radio and television stations?
by 
radiofan92
ANSWERS: 2
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probably ran out of letters
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They didn't run out of them, but would have, if they stuck to the 3 letter callsigns, since it's always W or K and only the last two change. Now they are usually 4, but can actually be up to 6 characters long.
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